Posted by Larry williams on Dec 07, 2012. If I press the gas pedal it goes away, but as soon as I take my foot off the gas it is back. I had cleaner tail pipes on my 1972 Fiat 124 sedan with a single 2 barrel Weber carb. Our gas heater is about 6 yrs. Here there is no oil being burnt with the fuel and hence a cleaner exhaust emission. thought bad cat was cause of the backfire. And I had checked my tires—at least I thought I had. My friend said that when it did it, it'd puff out black smoke too. Dont know what is wrong. So thats why I decided to completely rebuild my head. But don’t let the four-wheels give you a false sense of security. If the valve is still open when the mower is fully powered down, it may be letting fuel leak into other parts of the system. I guess you just get used to it. Backfires every time I let off, extremely loud. An engine running rich will sputter on acceleration. If you own a motorcycle, chances are you've experienced a backfire in the exhaust, which can cause quite a jolt for an unsuspecting rider. ATVs can be unstable and hard to control, particularly at high speeds. It's the unburned fuel igniting. First, take the gas line off the carb and turn the petcock on to see if gas is flowing to the carb. My 450 atv backfires when i let off the gas - 2005 Honda CRF 450 R. If the firing end of a spark plug is brown or light gray, the condition can be judged to be good and the spark plug is functioning optimally. When you let off the gas to shift a rich condition exist in the exhaust and if air is injected now you get the bacfire. First thing I checked was the plug wires and firing order and I found that the previous owner had two wires swapped and another wire was barely attached to the connector at the plug. Every time i let go of the accelerator, I get a loud backfire. Things were looking up: I replaced the spark plug, cleaned out the exhaust, adjusted the idle / fuel screws, and even replaced the brakes (I can stop now!). When there is something wrong with the alternator, the car runs off of the battery. I know you put a new one onbut the fuel pump is the issue, I think. Wait for a couple of minutes and it will start right up. An engine running rich will sputter on acceleration. I cant post in the 2 stroke forum yet. I even put my stock air filter back. Add in a lean stumble through when opening the throttle (no accelerator pump) the engine pre fires and forces a pre detonation back through the crankcase and. Why Does Your ATV Backfire? Backfiring in an ATV engine, or any small engine, is usually the result of either one or multiple spark plugs igniting the fuel in the chamber when it is out of turn, specifically during the combustion cycle when the exhaust valve is open on that cylinder. , while the engine is running or while shutting down. When you ride under about 15 it backfires out the airbox side of the carb on only the front carb pretty consistently, and when you downshift at speed (maybe 25+ mpg) and don't hold in the clutch it backfires pretty badly out the exhaust side, again only on the front. Backfiring is caused by the ignition of fuel and air in the INTAKE stream causing it to fire through the CARB. Lean running. The detailed answer: Ask five gearheads or mechanics their opinion of starting fluid, and you might get five different answers. Check float shaft for wear and float for leaks or dents. It began to backfire and sputter when giving it gas and is losing power. Is this normal or due to inferior pipes. You backfire through the pipe when it's LEAN, and you backfire through the intake tract (through the carb) when it's RICH. Using a gas stabiliser will keep the gas in your mower and your gas can fresh for up to two years. The exhaust is hot and ignites these fumes, thus you get a loud "pop" thru the exhaust. Why does my new scooter die every time I give it gas? Just got my brand new Eagle 50 scooter from Green Earth Scooters, I changed the oil first thing, filled the gas tank, and double checked all my nuts and …. check your fuel screw and make sure it has not fallen out (doesn't sound like it has). Once you get this set right and tightened, do it for the other adjustment screw on the other rocker arm. If your car does this from time to time, you may not need to do anything. Many modern vehicles have eliminated carburetors in favor of direct fuel injection controlled by a computer. If you have any doubts or lack the basic mechanical skills to perform the troubleshooting or repairs described in this post, you should rather take it to an authorized dealer and let them take care of it for you. there are 2 things. Club car golf cart backfires when I let off the gas, 3 days now, Yea, Nope, - Answered by a verified Technician We use cookies to give you the best possible experience on our website. My 16 HP did it too, but now that I let it idle it doesn't. Idle is ok, at about 900-1000. Any suggestion for a remedy? 2003 quadsport z400. Where i live and ride is around 3200 ft to 3800 ft. While riding bike, exhaust backfires/pops when letting off of the throttle in any gear, very annoying not just to me but to other riders. I have a 99 Polaris sportsman 500 that is backfiring through the carburetor. i really need some help here. It only happens maybe 75% of the time and its only on take offs from a dead. Hi, I have a 150cc twister think gy6 motor. you should do as i mentioned in my first post: 1. I pulled my spark plug and it looked ok, maybe a lil on the lean side, but not bad. 8L and the engine shut off. my quad started running like crap, it idles fine but seems to backfire through carb or something when you give it gas I cleaned carb twice, no change plug looks perfect, good color and clean fuel pump is working, clear filter is full of fuel would a bad ignition do this? any ideas? thanks!. 97 Chevy truck backfires when it tries to start?. Is backfire bad for your ATV? How big or bad the backfire is, is usually based on how loud the combustion sound is. I let the engine warm up a few minutes before driving each time. These can be diagnosed by a compression test, or by tracing top-end noise with a sounding rod or stethoscope. The noise indicates that the vehicle is out of tune and is performing poorly. My 2002 yamaha yz250f backfires and pops when I let off the gas. She started fine,and would rev fine, but when I'd open up the throttle in gear it'd pop and backfire. Let's go into detail about these 2 issues. Hi, I have a 150cc twister think gy6 motor. Let's say I'm in 1st or 2nd gear, accelerating normally, and then I floor it, I feel LOTS of hesitation and a pop or 2 (not a backfire) from the exhaust. Leaf Sprung, Front Axle. Place your hand over the end to aid in fuel flow to the carburator. Today I checked my ignition coils they are all firing, next I will pull plugs and check them, cats are original, look solid no holes or rattling,no sulfur smell in exhaust , noticed today it is running rough on idle, but when accelerating it will go with some hesitation,any acceleration past a quarter push and it bogs down bad and sputters and backfires with no power, and if you let off the. I can let go of the throttle and it'll settle back to idling. Backfiring on deceleration is caused by a lean fuel mixture. Clean that filter as well. start her up (don't touch throttle). I didn’t even see a hole in my gas cap. 2008 750 brute back firing when you let off the throttle. It only backfires when I get around 7000 rpm. The muffler gets hot enough to ignite the fuel, and when the fuel ignites HOLY S*%&!!!! This is perfectly normal for most newer engines and will diminish as they get broke in. The gas valve opens and sends gas to the pilot burner. All you need to do is provide us with your name and contact information requested below. About a second after I turn off the bike it backfires. Then hop on the quad and let out the clutch. With the wand of my detector 2" away from the exhaust termination I was getting carbon monoxide readings ranging from 300ppm to 700ppm. A backfire is an explosion that occurs either in the intake or in the exhaust of your motorcycle. It takes a few s. I tried to replace the spark plugs, the ignition coil and even the cdi. But once I really want to accelerate it takes a while to do so. It felt like a misfire b/c the bike would "stutter". The thing started right up ran good at idle. But I got it turned over first shot no problem and let it ilde for 1-2 mins and took off on it. Now the popping and backfiring is back at mid-throttle. It does not do it so bad if I leave the throttle cracked instead of completely closing it. The engine doesn't stall nor miss when it''s ideling. Remember that backfiring is caused by skewed ratios in the air-fuel mixture. I always assumed a little backfiring/popping out of the exhaust was normal when in higher RPMs and letting off the throttle. In rare cases, a backfire pop when accelerating. When it doesn't, the engine has an interruption. If anything, they are a bit too dark. start her up (don't touch throttle). Next, you CAN have a backfire from too much gas. When you ride under about 15 it backfires out the airbox side of the carb on only the front carb pretty consistently, and when you downshift at speed (maybe 25+ mpg) and don't hold in the clutch it backfires pretty badly out the exhaust side, again only on the front. check the jets you installed and make sure they are still installed 2. Lean running. riding around the yard It seemed to be ok. Employer Let Co-Workers Know My Medical Information I've got a pretty straight forward question. When this sensor detects a problem, it sends a signal to the engine to change the amount of fuel being used. This usually goes away once the engine warms-up. Make sure the key is in the on position. Take a look for holes. it is located on the clutch lever it is the top wire that is closest to you while you. Just curious. Things were looking up: I replaced the spark plug, cleaned out the exhaust, adjusted the idle / fuel screws, and even replaced the brakes (I can stop now!). Any suggestion for a remedy? 2003 quadsport z400. Here's why that's a good thing. If I let it sit, then it will start fine the next time, but still has the same problem with keeping running. you should do as i mentioned in my first post: 1. You can see the rough road in the pictures. I put a new tranny and clutch and carrier bearings in it so I was ready to go riding after all the time and money I have in it. If you have a leaf spring, solid front axle with the shackles mounted in the rear, your shock absorbers should be mounted as far outboard as possible, but with a slight lean to the rear (About 1 to 2 degrees of rearward rake for every 2 inches of lift above stock, compounded geometrically). These problems may include wrong exhaust upgrades, low-fuel grade, jet clogs and excess fuel among others. Generally I am very impressed with the machine. Intake manifold air leak: A common and continuing problem with Harley engines is air leaks around the junction of the manifold and the cylinder heads. I did a search, but couldn't seem to find the same problem I am having. Shop for ATV Batteries in Batteries and Accessories. Sometimes a gas station may have a damaged water filter in their pump which does not do a good job of filtering out the water from their fuel. Why Does Your ATV Backfire? Backfiring in an ATV engine, or any small engine, is usually the result of either one or multiple spark plugs igniting the fuel in the chamber when it is out of turn, specifically during the combustion cycle when the exhaust valve is open on that cylinder. Once you get this set right and tightened, do it for the other adjustment screw on the other rocker arm. If your car does this from time to time, you may not need to do anything. First thing,weather is it Backfiring or Afterfiring. This explosion is supposed to occur in the combustion chamber, and when it doesn't, there is an interruption in your engine's operation. Is it because my engine is running rich (deliberate)? I thought it was a "mini backfire" from unburned fuel igniting in the hot exhaust but the engine does it ice cold too! It doesn't sound like it is hurting anything. (closer than the last engine I had) But anyways, I built the bike. my quad started running like crap, it idles fine but seems to backfire through carb or something when you give it gas I cleaned carb twice, no change plug looks perfect, good color and clean fuel pump is working, clear filter is full of fuel would a bad ignition do this?. Put valve cover and spark plug back on and try it out. Every time I step on the gas past 1/4 throttle it backfires like crazy and someties kills the engine. Note: Backfire and afterfire through the carburetor will not harm the engine at all! Find out the most common causes and possible fixes for engine backfire and afterfire. the fuel that doesnt get burned off builds up in the exhaust until there is a bunch and then it all ignites causing a popping sound, usually when u let off the throttle after a full throttle rip. carb was rebuilt think its not lean. My other Brutes have done this too, but the backfire is not as sharp or loud. But I got it turned over first shot no problem and let it ilde for 1-2 mins and took off on it. I checked the pressure and I checked the tread. Let’s go into detail about these 2 issues. Wow, sounds like I just shot the neighbor, Doesn't matter warm or cold, can be riding around in 2nd or 3rd gear and let off the throttle and bang, backfires extremely loud. The valves have a clearance of. It seems to do it worse when its cold. I notice that when I am accellerating, if I let off the throttle, my exhaust backfires and pops. Chevy machanic did not know what it was. Has anyone ever used the single big-blade bucktail from Muskie Safari. Assuming all of your plugs and wires are in the correct locations and you haven't messed with the timing at all, then the most common cause of backfiring through the carb (spitting or coughing) is in the morning when a carb's air/fuel mixture is a bit too lean. A person that works at O'Reilly who works on Honda's has been great help to me trying to get the car running. Let's say I'm in 1st or 2nd gear, accelerating normally, and then I floor it, I feel LOTS of hesitation and a pop or 2 (not a backfire) from the exhaust. That kind of popping/backfiring. In my how-to video I will walk you through the basic principles and fundamentals of what you are adjusting and how it will impact your bike's response. Hold it to the floor and it will backfire just as the rev limiter kicks in,, runs great other than that. I have a 04 Fatboy injected with Air cleaner upgrade and SE II's and when I let off the gas I get a pop or backfire through the exhaust. Oh, yeah, I also had left the cap off after filling the gas recently and had run the mower for an hour with the gas cap off and hanging to the side, and even saw some pine needles floating in the gas that I plucked out. Once my speed gets below 60 mph the noise is gone. I have replaced the carburetor with a new one. The backfiring of the motorcycle is a signal that something isn't quite right. ATVs can be unstable and hard to control, particularly at high speeds. I have a 1999 Yamaha Grizzly 600. Next, turn off the engine with your foot on the gas pedal. About a second after I turn off the bike it backfires. That's what the air pump does, it pumps air into the exhaust manifolds and the gas still there burns a little more. i thought a backfire was from running too rich, which isnt as bad a running lean. One of my friends just bought a 2004 YZ450F and his is backfiring a lot too. My car has been sitting for about 5-6 months, so yesterday I go to start it as I am starting to get it ready for autocrossing. General Registration -- This registration permits the ATV to be operated off the owner or operator’s private property. The reason eight Yamaha golf cart may backfire when slowing down, is the air to fuel mixture needs adjustment. Gas getting into oil becomes a cause for concern when the volume of gas exceeds 2. Most often a backfire is the result of an air leak in the exhaust system. , while the engine is running or while shutting down. Open up the air box and make sure it's not filled with gas or anything else. For some reason my YFZ has developed a problem thats just off idle. Turn it clockwise until it lightly seats (till it stops) - count. the scooter still backfires during deceleration. Sounds like a sticking gas float in the gas tank. Whenever i let off the gas it pops and backfires. It is possible to see a short-lived flame coming from the exhaust. I replaced a faulty air cut off piston and my backfiring ceased. Fortunately, battery issues are some of the easiest to fix. My car is running great as far as stop and go, cruising, WOT, etc. I did a search, but couldn't seem to find the same problem I am having. It began to backfire and sputter when giving it gas and is losing power. My old tractor style 46" deck, Craftsmen, powered by a 24 Hp, B & S Intek engine's manual never mentioned having to do this. A backfire out of the exhaust system is caused by a ratio that is too rich (too much fuel). My 450 atv backfires when i let off the gas - 2005 Honda CRF 450 R. First thing,weather is it Backfiring or Afterfiring. The first gear requires more torque to turn the motor, so it may be easier to use 2nd if you can't get the quad rolling very fast. riding around the yard It seemed to be ok. In each of the 3 instances, I checked the products of combustion with my gas detector and in all 3, I found 0% lel natural gas (perfect). com is the largest Kawasaki ATV owner's forum with information for the Kawasaki KFX700, Brute Force, Prairie, Bayou, Mojave, Lakota and older model Kawasaki ATV's!. Once my speed gets below 60 mph the noise is gone. Mine does backfire too and it only started doing it after I took my sparkarrester out (yes it made it run better after taking it out bc it let's it flow better) but the reason it backfires after you took the arresster out is bc when your on the gas hard it's. It didn't matter what gear I was in, anytime I'd get the rpm's up and run at a constant speed, it'd pop. my brother in has a 90 something foreman and it was backing firing every time he geared down , after some checking out he said he found a broke off bolt on his header pipe where it connected to the engine. I was told by a dealer that the Kohler will backfire unless you let it idle for a minute or two before shutting down. If the furnace made a clicking noise trying to turn on and then makes the BANG noise at the furnace, it’s most likely a delayed ignition. is there such a thing as an anti backfire valve. The pump leak down is here. This occurs commonly when the engine is running rich, running lean or has an exhaust leak. backfiring during deceleration. and scope tests,we do the fuel pump leak down test on my pump page then do the 2 balance tests. Backfire definition is - to have the reverse of the desired or expected effect. Wait for a couple of minutes and it will start right up. It starts right up but after about 10 minutes it just shuts off. Take a look for holes. A backfire in the intake manifold is caused by a ratio that is too lean (not enough fuel). After waiting a few seconds, restart your car with your foot still on the gas pedal. What does that mean? That there is unburned fuel in the exhaust pipe? Also when I try to start my bike and wont start but lets off a loud bang! Scares me and neighbors cause sounds like a gun shot. you didn't state what your plug looks like, but that will be a tell-tell sign of what your engine needs. If you are on the gas then the power commander is adding the extra fuel it is programed to add. i just got my warrior about 3 months ago and it was doing something similar it would idle good but then as soon as you gave it any gas it bogged down really bad and you could barely give it enough gas to get it into gear without stalling. This usually goes away once the engine warms-up. Re: Why do my Kohler engines backfire when shut off? When you shut the engine off( especially from a high rpm) you load the exhaust with raw gas fumes. Most gas carts do not have fuel injection and do not backfire. for sum reason when i start gettin low on gas, my 400ex will start to backfire. Ask: We have a Tao Tao 150 and the thing cost almost $2,100. You should hear the engine turning and if you give it a little gas, it should. No real mods (K/N, Flowmaster exhaust). pops and backfires when letting off gas. This explosion is supposed to happen inside the combustion chamber. Many modern vehicles have eliminated carburetors in favor of direct fuel injection controlled by a computer. What Does Black Smoke Mean. Low Fuel Pressure or Weak Fuel Pump—Like a clogged fuel filter, this would cause your engine to not get enough fuel to the combustion chamber. Mine does backfire too and it only started doing it after I took my sparkarrester out (yes it made it run better after taking it out bc it let's it flow better) but the reason it backfires after you took the arresster out is bc when your on the gas hard it's. Ford F-250: Why is My Truck Hesitating? Hesitation, or a lack of throttle response, is a symptom with many causes. The pump leak down is here. I just got it and it is running great other than the fact that it is backfiring. But if I am giving it a lot of throttle and then completely let off, it will more than likely backfire. If the flywheel key was snapped and timing was off, you would still get some backfiring, sometimes thru the carb. I bought a couple weeks ago. any ideas on why truck boggs down when i get on the gas?. We'll make sure to update the site. What it is, is incomplete combustion, fuel is left over, and shot into the exhaust pipes. guess it was sucking air in when he let off the throttle , but you could check for something like. (But believe me, 1/4 throttle is plenty enough to get you in trouble). Make sure you have fuel getting to the carburetor. You might have to adjust this a few times because when you tighten the nut, it might cause this screw to turn and tighten. So I will try here for now. A backfire in the intake manifold is caused by a ratio that is too lean (not enough fuel). Q: The engine dies when I take my foot off of the accelerator. Once started, a lawnmower typically keeps running until you power it off. Let's now make sure that the on/off switch located on the handlebar is in the on position. Hi, I have a Chinese brand ATV (Coolster). I revved the engine holding it at about 2/3 throttle and at least it didn't spit and pop through the carb but when I let off the throttle it went down to about 1/4 throttle and the RPMs stayed there until I bumped the throttle then it dropped to a really low idle and then once again it died. I managed to finish the yard with it running slow. If a large amount of gasoline does get into the engine oil; change the oil immediately upon fixing the problem that has allowed this to happen. The company’s stock will indeed drop about 6 percent over the next day. It is very loud, but doesn't seem to affect anything as far as power/performance. Changed the filter and it never did it again. Checked valve lash, taken carb completely apart several times. Is backfire bad for your ATV? How big or bad the backfire is, is usually based on how loud the combustion sound is. But I got it turned over first shot no problem and let it ilde for 1-2 mins and took off on it. It is a slant head with the carburater that is mounted closer to the engine. A backfire out of the exhaust system is caused by a ratio that is too rich (too much fuel). The bike is NOT Backfiring. Many modern vehicles have eliminated carburetors in favor of direct fuel injection controlled by a computer. riding around the yard It seemed to be ok. So thats why I decided to completely rebuild my head. I have a Rhino and every time I let off the gas it backfires. Discussion Starter • #1 • Jun 1, 2011. Changes to the Exhaust or Muffler on the ATV. Well going back to the last time you used it, the gas and oil going into the engine from the carb and oil pump are atomized into very small particles so they can burn and the engine can make power. Put valve cover and spark plug back on and try it out. Suddenly at the end of my last session, the rpms dropped but it kept running. The carburetor regulates the flow of fuel and air to an engine. then it can take a long time. It is very loud, but doesn't seem to affect anything as far as power/performance. A Hole in the Exhaust—If there’s a hole in your exhaust system (muffler or tailpipe) near the engine, this would cause backfire. While riding bike, exhaust backfires/pops when letting off of the throttle in any gear, very annoying not just to me but to other riders. This allows moisture to build up in the oil and the vent line on the reservoir gets plugged with frost and ice. Does anyone have any ideas? IT COULD JUST BE RUNNING TO RICH DOES IT DO IT THREW THE CARB JUST THE TAIL PIPE LET ME KNOW JUST MIGHT NEED TO BE TOONED JUSTA FEW TURNS ON THE. Since you recently rebuilt the motor, it's possible the rings didn't seat properly, which could cause blowby past the rings. Also when ever I pull up to a stop light even if it is warm it will die unless I kick the throttle real quick then it stays idling fine. Popping noises from a carburetor indicate. Check for leaks that may have been caused rats chewing off the fuel pipes. Once you confirm you have plenty of propane, check the regulator hose and tank for signs of a leak. It is a 1997 GMC Sonoma and I have no idea what is wrong with it. Tried adjusting the enrichener, but would only raise the idle and would not stop the backfiring/popping. This is a very common problem with cars today and the fix can be very easy and often times performed at home. Enrichening The CV Jetting. Most problems that will cause a John Deere lawn mower to stall after 20 minutes occur due to the distribution and rate of flow in the fuel and air systems. Got on it and after letting off the throttle its backfiring and seemed to bog a bit at slow speed. The problem has gotten progresively worse and now it runs like garbage pretty much all the time. Remember that backfiring is caused by skewed ratios in the air-fuel mixture. Recently my grizz has been popping/backfiring back through the carb at low rpms. When the throttle of an engine is closed at higher RPMs, a very strong vacuum is created in the intake manifold - this causes a lot of fuel to be drawn in via the idle circuits of the carburettor, and even exhaust gases drawn back from the exhaust. If these systems are dirty or restricted, the mower will stall out and be difficult to restart. A rich mixture is caused by too much fuel compared to the amount of air being used during combustion. When you ride under about 15 it backfires out the airbox side of the carb on only the front carb pretty consistently, and when you downshift at speed (maybe 25+ mpg) and don't hold in the clutch it backfires pretty badly out the exhaust side, again only on the front. The first gear requires more torque to turn the motor, so it may be easier to use 2nd if you can't get the quad rolling very fast. I do notice there is a small exhaust leak where the muffler slides onto the pipe, do you think this leak could effect the backfire problem?. You might have to adjust this a few times because when you tighten the nut, it might cause this screw to turn and tighten. Each Polaris…. Want Answer 0. POSSIBLE SOLUTION. Took awhile to get it started but it ran. Jump to Latest Follow 1 - 15 of 15 Posts A forum community dedicated to all Suzuki ATV owners and enthusiasts. :eatdrink021: My Yamaha G16 gas golf cart backfires almost everytime you let off the gas and come to a stop, Ive only owned it a couple months but it is a 1989 or something like that. If a large amount of gasoline does get into the engine oil; change the oil immediately upon fixing the problem that has allowed this to happen. This strikes me really weird. I have tried turning the steering wheel, letting off the brake and so on. My idle is smooth, and my fuel consumption is normal. Next, turn off the engine with your foot on the gas pedal. Jerks forward and backwards on slow take off. I was told by a dealer that the Kohler will backfire unless you let it idle for a minute or two before shutting down. Wont start and backfiring! Help! Jump to Latest I'd start with a new sparkplug. No POPs at all, check plug, plug wire, etc while the plug is off, squirt about 1/2 teaspoon of fuel mix in there and see if that makes the saw POP a couple times. Dont know what is wrong. If the furnace made a clicking noise trying to turn on and then makes the BANG noise at the furnace, it's most likely a delayed ignition. Falling off happens, crashes eventually occur and even at slow speeds, it still hurts! Much like strapping a seat belt on when driving a car, always wear the appropriate riding gear including a helmet , goggles, gloves and boots. Awesome adventure today. Ask: We have a Tao Tao 150 and the thing cost almost $2,100. It happens to the best of us. Re: exhaust popping noises when letting off gas? Sounds like exhaust backfire. , while the engine is running or while shutting down. What Cause a Car to Backfire: 5 Reasons behind the Problem. Does anybody else think that his throttle cable needing adjustment is due to it setting off the the EPC that is located in the thumb throttle box? I have had that happen before. Took awhile to get it started but it ran. I let it idle for a little bit, maybe 10 min, then went to. I'm getting good at longboard now, since I'm not exhausting myself pushing or climbing hills. i have a used mule and it had very little hours on it but its a 2003 - sat for a long time and i thought i had. They obviously came from one of those red plastic gas cans. Gas getting into oil becomes a cause for concern when the volume of gas exceeds 2. If I press the gas pedal it goes away, but as soon as I take my foot off the gas it is back. Low Fuel Pressure or Weak Fuel Pump—Like a clogged fuel filter, this would cause your engine to not get enough fuel to the combustion chamber. Thanks for watching Subscribe for more. The VOES seems to be working because the engine slows down when the hose is removed (low vacuum so it switches to the other ignition curve), and it switches at 6psi with my vacuum pump. Enrichening The CV Jetting. The No Toil Super-Flo Replacement Air Filter is a flame resistant foam material that will help eliminate the need of your spark screen. (But believe me, 1/4 throttle is plenty enough to get you in trouble). If your car does this from time to time, you may not need to do anything. Measure the voltage of the battery with ignition off and with the engine running. It felt like a misfire b/c the bike would "stutter". Read More ». You will have to find out why the fuel pump is not pumping. riding around the yard It seemed to be ok. Has new plug and decent spark. Tried adjusting the enrichener, but would only raise the idle and would not stop the backfiring/popping. So bad that when it would backfire through the carb it would kill the engine. Still remains firmly in gear. my quad started running like crap, it idles fine but seems to backfire through carb or something when you give it gas I cleaned carb twice, no change plug looks perfect, good color and clean fuel pump is working, clear filter is full of fuel would a bad ignition do this? any ideas? thanks!. Thanks for watching Subscribe for more. I didn’t even see a hole in my gas cap. It can float over the hole the gas has to flow through and block the fuel flow. stator is goin bad and ecm shorts out. No POPs at all, check plug, plug wire, etc while the plug is off, squirt about 1/2 teaspoon of fuel mix in there and see if that makes the saw POP a couple times. One of my friends just bought a 2004 YZ450F and his is backfiring a lot too. Drilled the main jet. Yesterday it decided not to keep the burner on long enough to heat the water. Top the tank off with fuel. Afterfire occurs after the engine has been shut off. My O2 sensor is new (from my smog test fiasco about six months ago). Why does my ATV engine pop when I give it throttle? This is the beginning of a very detailed question one of our readers asked the ATV AnswerMan. It will either take your vehicle a few seconds to respond to the gas pedal before it accelerates, or it won't accelerate at all. Why Does My Engine Backfire or Afterfire? Understand what causes backfire and afterfire in your small engines, as well as simple fixes that could repair any loud noises coming from your engine. with different carb (which came off good running car) has backfire through exhaust when you give it gas took the valve cover off got piston up to TDC both valves closed set distributor to #1 position checked plug wires 3x's or more for correct order. The air cut-off valve is expensive (about $70) and should be replaced after all other suspects tested have failed. Backfire is a condition described as a loud bang, poof, explosion, etc. When I let off the throttle and the engine is slowing the car down (4 speed manual), I'm getting an exhaust backfire. For the most part, when I am riding hard and I let off of the gas the backfire is really loud. The thing started right up ran good at idle. And Dirt Legal’s titling services can get your ATV a legal license plate, which might sound crazy but it’s what we do. Many riders usually experience a backfire when they suddenly let off the throttle. Idle is 1500rpm. Afterfire occurs after the engine has been shut off. The backfiring of the motorcycle is a signal that something isn't quite right. I had thought it was the fuel pressure regulator and the O2 sensor but I replaced them both and it will not start regularly unless I give it gas and hold the gas pedal and if I let off it turns off. Ask a Question. Most gas carts do not have fuel injection and do not backfire. better after worms up but still popping. Why can not I find ATV graphics kits for my utility ATV? - Companies rarely make graphics for utility ATVs. If your car does this from time to time, you may not need to do anything. I was able to remove the rocker, pin, valve spring keeper and spring by hand and then used pb blaster, a brass hammer and needle nose pliers to work. It only happens maybe 75% of the time and its only on take offs from a dead. Thank you for using Manage my life. The question is; If removing the ethanol from the fuel (mixing water with the gas, then shaking the container to have the water absorb the ethanol, then draining off only the gas) then adding a very thin 2 stroke oil to the fuel (maybe 100 to 1), will the oil leave a film on the inside of the gas tank, and rubber gaskets to somewhat protect the. The backfire is through the exhaust not the carb and happen when the throttle is opened up from idle (roughy 800 rpms) This started to happen after I changed the plugs, plug wires and removed the header to get the plugs. That kind of popping/backfiring. My truck has been having quite a bit of trouble since I bought it back in June. Afterfire occurs after the engine has been shut off. We rode for exactly four days and the muffler broke off in the yard without anybody even being on it. Tightening jet the fell out helped. the engine ran fine on initial start up but original carb leaked gas. It began to backfire and sputter when giving it gas and is losing power. I just bought a 2008 sivlverado 1500 LT. If this keeps happening to you, though, you may want to have someone take a look at your fuel gauge as it could be giving you a false reading. Make sure you have fuel getting to the carburetor. What Is The Best Fuel For ATV? I was wondering the same question when I filled up my ATV for the umpteenth time with the same fuel I have always bought it for the last 6 months. Proper opening of throttle and clean carburetor. IMO your idle screw under the gas shut off has vibrated out cutting you gas flow off. Try getting your carburetor cleaned and make sure throttle is opening properly. Hi, I have a 150cc twister think gy6 motor. To make an older car backfire, start the vehicle and bring it to a steady rev as you normally would, then turn the engine off with your foot on the gas pedal. Hi, I have a Chinese brand ATV (Coolster). The spark has to go somwhere, so it exits the exhaust, causing the bike to backfire. I was able to remove the rocker, pin, valve spring keeper and spring by hand and then used pb blaster, a brass hammer and needle nose pliers to work. ATVs in the village make a lot of short trips in cold weather. Here is my problem. the fuel that doesnt get burned off builds up in the exhaust until there is a bunch and then it all ignites causing a popping sound, usually when u let off the throttle after a full throttle rip. its backfiring whenever i let off the gas and sometimes when i floor it it will studder for a second then go, so its running lean rite Show Full Signature 2006 trx450er was the last honda atv h34r:. As soon as you touch the gas it'll do nothing then pop or bog for a second then take off like nothing happened all the way through the gears just fine. Today was the first time it ran right all day, and idnt die. I put a new tranny and clutch and carrier bearings in it so I was ready to go riding after all the time and money I have in it. A rich mixture is caused by too much fuel compared to the amount of air being used during combustion. What Causes a Riding Mower to Sputter & Die?. So bad that when it would backfire through the carb it would kill the engine. It gets page views, but it’s not very rational IMO. I can let go of the throttle and it'll settle back to idling. Have gotten my trike running pretty good only problem left is when I let off the throttle and the engine RPMS drop I got some minor backfire out the exhaust. The spark has to go somwhere, so it exits the exhaust, causing the bike to backfire. If needed, replace the fuel pump. I bought a new engine off ebay. If the bike, when you let off the throttle, make loud and hard popping/cracking sounds, almost like firecrackers, it is likely to lean on the idle/pilot circuit. 454 Backfires - Problem Identified Hello All - Newbie Here - wanting to share a recent find. It was like this for a while until I noticed it getting worse. But after it warmed up it would hardly do it. There are a few issues with your unloading valve that causing stalling the engine pump. The muffler gets hot enough to ignite the fuel, and when the fuel ignites HOLY S*%&!!!! This is perfectly normal for most newer engines and will diminish as they get broke in. Typically backfiring results from various malfunctions related to the air to fuel ratio. Here is a link to order any parts you need. I was told by a dealer that the Kohler will backfire unless you let it idle for a minute or two before shutting down. With the colder weather, it's probably even worse. The blades are bigger than anything I saw at the expo. Then hop on the quad and let out the clutch. The latest problem is that it stalls when you let off the gas. 8L and the engine shut off. but now theres a new cat and still have the backfire. The backfiring can be fixed by going to a larger slow or pilot jet, in this example the next size up is 42. There aren’t many parts involved in making a quad bike street legal. Recently my van has cut off going down the road but started back after a few minutes of cranking it. We only had it 5 months and the carb went. The problem has gotten progresively worse and now it runs like garbage pretty much all the time. This is the main reason why modified Harley engines tend to backfire through the carburetor more frequently than stock engines. and you may want pick up a climer manual they have all the tests in there exept for the cdi cause you cant. Every time i let go of the accelerator, I get a loud backfire. In my how-to video I will walk you through the basic principles and fundamentals of what you are adjusting and how it will impact your bike's response. While riding bike, exhaust backfires/pops when letting off of the throttle in any gear, very annoying not just to me but to other riders. My car has been sitting for about 5-6 months, so yesterday I go to start it as I am starting to get it ready for autocrossing. Then hop on the quad and let out the clutch. But after it warmed up it would hardly do it. Testing and checking can. Afterfiring can also be caused by cylinders which are not firing because of faulty spark plugs, defective fuel injector nozzles, or incorrect valve clearance. The bait seems weighted suffi. Last Updated on April 16, 2020. To check your systems valve remove it and blow in ti both ways to check air flow. My atv is backfiring when I give it the gas and also cuts out when riding. it was a simple carb adjustment. Proper opening of throttle and clean carburetor. It runs fine but whenever I let go of the gas for more than a second it'll start to die. Gas getting into oil becomes a cause for concern when the volume of gas exceeds 2. start her up (don't touch throttle). Most gas carts do not have fuel injection and do not backfire. I just bought a 2008 sivlverado 1500 LT. Why is the engine bogging under acceleration? I recently managed to get the moped running properly, albeit for only a short time. Its been sitting for about a year. IMO your idle screw under the gas shut off has vibrated out cutting you gas flow off. Jump to Latest Follow Are you sure it is backfiring, and not the back pressure from the exhaustmine will pop every once in a while but it does not backfireusally in low gear after going fast and letting it roll to a stop. Funny thing is it idles fine just like its supposed to, but when you push the throttle, it starts backfiring and sounds like it chokes to death and will kill the engine if you dont let off quickly. Step 5: Check for Vacuum Leaks. ATVs can be unstable and hard to control, particularly at high speeds. In fact, when we pulled it off and opened it, took all of the jets out and cleaned them anyway, it was clean, but still leaks gas when we run the ATV. When the spark is intermittent, it can cause a buck and make your car backfire when fuel builds in the cylinders. It started popping/backfiring when I would let off the gas, mostly on a downhill a few months ago. I costed into the break down lane and shut the key off and tried to start it again and it will turn over but not start. It gets page views, but it’s not very rational IMO. I guess you just get used to it. Assuming all of your plugs and wires are in the correct locations and you haven't messed with the timing at all, then the most common cause of backfiring through the carb (spitting or coughing) is in the morning when a carb's air/fuel mixture is a bit too lean. Battery, Check. Why losing weight too quickly may backfire in the long run. carb was rebuilt think its not lean. riding around the yard It seemed to be ok. Many riders usually experience a backfire when they suddenly let off the throttle. Recently my grizz has been popping/backfiring back through the carb at low rpms. It also does it sometimes when I let off the throttle. so its a bit louder. After waiting a few seconds, restart your car with your foot still on the gas pedal. I replaced my valve seals, but that did not help the smoke. cut exhaust tube and drilled holes in end still same. The pilot light is lit by an electronic spark. Carburetor out of adjustment. I revved the engine holding it at about 2/3 throttle and at least it didn't spit and pop through the carb but when I let off the throttle it went down to about 1/4 throttle and the RPMs stayed there until I bumped the throttle then it dropped to a really low idle and then once again it died. Backfires occur in one of two places. When there is something wrong with the alternator, the car runs off of the battery. The No Toil Super-Flo Replacement Air Filter is a safe replacement for your OEM filter. This is the main reason why modified Harley engines tend to backfire through the carburetor more frequently than stock engines. On my 360 when i have it at high rpm's and let off the gas when going down the highway or something, it makes some sorta popping noises that sounds like exhaust escaping but from the engine compartment. Better still, you can choose to receive email messages on all Honda products or just those you're most interested in. Generally I am very impressed with the machine. It has app 1800 miles and seems to be getting worse. Re: Why do my Kohler engines backfire when shut off? When you shut the engine off( especially from a high rpm) you load the exhaust with raw gas fumes. it was a simple carb adjustment. That kind of popping/backfiring. Why Does Your ATV Smoke? Your ATV can smoke for one of 3 reasons: 1) black smoke is generally benign and is due to an overly rich fuel mixture 2) blue smoke is a bigger concern and is due to cross contamination in the air fuel mixture within the cylinders 3) white smoke is typically water droplets being burned off as steam, but can be a very. I did a search, but couldn't seem to find the same problem I am having. ATV Riders Forum > ATV Riders Mechanical Section > ATV It just pops and sounds like crap if I go down a hill and let off the gas. (closer than the last engine I had) But anyways, I built the bike. I have an 89 Polaris Indy Sport 340. What carb adjustment should I make? Lower the main needle a clip? or what? Any suggestions would be greatly appreciated, thanks. Then, just before he walks off, he pauses for a second or two, taking in the moment. You can see the rough road in the pictures. Intake manifold air leak: A common and continuing problem with Harley engines is air leaks around the junction of the manifold and the cylinder heads. 003" bigger. It will either take your vehicle a few seconds to respond to the gas pedal before it accelerates, or it won't accelerate at all. Engine hunts (at idle or high speed) Carburetor Leaks. Funny thing is it idles fine just like its supposed to, but when you push the throttle, it starts backfiring and sounds like it chokes to death and will kill the engine if you dont let off quickly. Any changes you make to your four-wheeler's exhaust will ultimately affect how the exhaust and fuel system operates. If the performance is poor at low speeds, check for a white smoke in the crankcase breather tube. Since you recently rebuilt the motor, it's possible the rings didn't seat properly, which could cause blowby past the rings. The detailed answer: Ask five gearheads or mechanics their opinion of starting fluid, and you might get five different answers. Let's say I'm in 1st or 2nd gear, accelerating normally, and then I floor it, I feel LOTS of hesitation and a pop or 2 (not a backfire) from the exhaust. What Cause a Car to Backfire: 5 Reasons behind the Problem. Why Does Your ATV Backfire? Backfiring in an ATV engine, or any small engine, is usually the result of either one or multiple spark plugs igniting the fuel in the chamber when it is out of turn, specifically during the combustion cycle when the exhaust valve is open on that cylinder. I was able to remove the rocker, pin, valve spring keeper and spring by hand and then used pb blaster, a brass hammer and needle nose pliers to work. Deceleration Backfire is caused by fuel burning in the exhaust manifold or header. My atv is backfiring when I give it the gas and also cuts out when riding. car backfires when letting off gas - posted in Virtual Mechanic: Hi, I noticed that whenever I let off the gas pedal after getting to speed, ie 40mph at 3500rpm, the car sputters and backfire's right around 2500 rmp and as the car sputters, I see that the tach moves rapidly back to 1000 rpm (idle). neither is very difficult unless you are guessing at the size jet you need. On top of the noise, I didn't like the way the exhaust 'gurgled' when letting off the gas at lower rpm with my exhaust tip, sounded like real crap. Never a good sign. It does fine driving around, but when you let off the gas, and just sitting at idle, it runs kinda rough, and eventually dies. Search Fixya Bogging out when give my four wheeler gas I have a 400 honda foreman it will turn over but will not crank when i hold the throttleand then let off of it then pull start it it backfires but then will just turn over any ideas. I will not question success but I do not know any more than I did. My dad's Rhino would backfire when you let off the gas. The thing started right up ran good at idle. You might have to adjust this a few times because when you tighten the nut, it might cause this screw to turn and tighten. If you have a direct ignition furnace, you won’t have a pilot light. This allows moisture to build up in the oil and the vent line on the reservoir gets plugged with frost and ice. pops and backfires when letting off gas. The thing started right up ran good at idle. My atv back fires really bad. down to vacation and left it like that overnight because the fan would not turn off by its self. No ifs ands or buts, that's what causes it. u may have an exhaust leak causeing it to run lean (which causes poping) check for ehause cracks or loose bolts. Check them every month, lest your car riseth up and smiteth thee. For most of us, consistently eating less than the calorie minimum is a bad idea because it leads to a: Slower metabolism and lousy side effects. you didn't state what your plug looks like, but that will be a tell-tell sign of what your engine needs. It can be fixed up easily if you are aware of the issue and follow a regular maintenance routine of your bike. An engine backfire is an explosion produced by an internal combustion engine. Recently my grizz has been popping/backfiring back through the carb at low rpms. In a properly running engine, spark-triggered ignition typically occurs a few degrees before the piston reaches top dead center (TDC). its backfiring whenever i let off the gas and sometimes when i floor it it will studder for a second then go, so its running lean rite Show Full Signature 2006 trx450er was the last honda atv h34r:. The only thing it will do is cost you extra money, so don’t do this. This popping is often referred to as the bike backfiring. If gas rushes out of the petcock, then the restriction is in your carburetor. I have a 99 Polaris sportsman 500 that is backfiring through the carburetor. If your pressure washer shuts off when the trigger is released, it has a problem with the unloader valve. Every time I step on the gas past 1/4 throttle it backfires like crazy and someties kills the engine. The backfire is produced when unburned fuel ignites inside the intake or exhaust manifold instead of a cylinder. It didn't matter what gear I was in, anytime I'd get the rpm's up and run at a constant speed, it'd pop. That makes the ATV run a little rich on air for that moment. Turn it clockwise until it lightly seats (till it stops) - count. The thrill of riding your motorcycle is lessened somewhat if your motorcycle tends to backfire. Let’s know about 5 reasons that cause car backfire. When I get over 60 mph and let off of the gas there is a grinding/rattling noise. Take a look for holes. Hold it to the floor and it will backfire just as the rev limiter kicks in,, runs great other than that. Check the wires behind the fuse holder and the charging jack. Mine does backfire too and it only started doing it after I took my sparkarrester out (yes it made it run better after taking it out bc it let's it flow better) but the reason it backfires after you took the arresster out is bc when your on the gas hard it's. (carbs work on throttle position not rpm) Check all idle ports for dirt etc. Intake manifold air leak: A common and continuing problem with Harley engines is air leaks around the junction of the manifold and the cylinder heads. Search Fixya Bogging out when give my four wheeler gas I have a 400 honda foreman it will turn over but will not crank when i hold the throttleand then let off of it then pull start it it backfires but then will just turn over any ideas.