Sport & Outdoor – Others
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Your timing is off. Backfiring occurs because the exhaust valves are open when the fuel is combusting.
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The engine backfire on deceleration is also caused by the too lean air/fuel ratio – A lot of people think that the backfire/popping in the exhaust is caused by too rich mixture, but it`s actually the other way round.
The spark inside the chamber may not burn up all the fuel, allowing a little extra gasoline vapor to enter the exhaust, and lead to a backfire. This can be caused by a faulty mass airflow sensor or a clogged engine air filter “choking” the engine and not allowing enough oxygen to flow into it.
Rich Air/Fuel Mixture
If too much fuel is added to the engine, it may not all burn up before the exhaust valves open — letting unburned gasoline into the red-hot exhaust headers, where it can combust and lead to a backfire.
A mixture of air and fuel that`s got too much gas in it is called, “rich.” When a rix air/fuel mixture is ignited in the cylinder, the whole mixture won`t be burned up by the time the exhaust valves open. Then, the combustion process will flow to the exhaust where a backfire will take place.
Another possible cause of your backfire is a spark plug refusing to “spark” when the exhaust valve opens. If the air/fuel mixture has become too rich, unburned fuel is left in the exhaust system. The misfired spark plug ignites the rich air/fuel mixture, causing a loud “bang” in the tail pipe.
On bikes that keep the injectors on during deceleration adjustments to the fuel table in the zero percent fuel column from 2,000 rpm to redline may help reduce popping. A value of positive or negative 15-40 should be added and can reduce popping if it is still noticeable.
An engine backfire occurs whenever the air-fuel mixture in your car combusts somewhere outside the engines cylinders. This can cause damage to your cars exhaust or intake if left unchecked — and it also means that your cars engine isnt making as much power as it should, and is wasting lots of fuel.
Backfires
Touching back on air to fuel ratios, a vacuum leak will likely make your engine run “lean” (too much air.) This means the engine cannot efficiently ignite fuel in the combustion chamber. When fuel builds up in the cylinders and combustion occurs, it will expel a backfire.
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. This usually goes away once the engine warms-up.
Blown gasket may be cause of backfire.
Too little fuel in the cylinder and an excess amount of air can cause your bike to backfire. The combustion can be suppressed if too much air is present. Again, this issue can be fixed by making sure your carburetor jets are clean.
A backfire is usually accompanied by a bang or a loud noise from the engine or exhaust. If the noise is really loud then this could potentially mean damage to the cars intake or exhaust system. If the car exhaust is smoking after backfiring then the car might need to be checked.
Poor Fuel-Air Ratio
When combustion doesn`t happen in a timely manner, the exhaust valve opens while the air-fuel mixture is still igniting, causing this explosion to “spill” out of the cylinder, making a loud popping noise. In newer vehicles, computerized sensors help ensure the air-fuel ratio is correct.
To recap, decel pops are common and nothing to worry about, but unless you`re riding a bike that`s been modified and professionally tuned, backfires are a sign that all is not well with your bike`s setup.
If your engine is getting more fuel than it needs, a rich fuel to air ratio is the result. When your car has leftover fuel in the exhaust and the cylinders, that fuel explosively burns and creates a loud popping sound. Specifically, here we mean delayed timing, which causes the backfire.
Backfiring in internal combustion engines occurs outside of the combustion chamber, and is typically the result of an improper air to fuel ratio. An overly lean air-fuel mixture (i.e. an overabundance of air) can lead to a failure to ignite in the combustion chamber, also called a “misfire”.
A defective positive crankcase ventilation (PCV) valve or a malfunctioning exhaust gas recirculation (EGR) valve also can cause a backfire.
The major symptom of a vacuum leak is very poor idle quality, stalling, Spitting back through the Intake, and a very lean condition at part throttle. This is the most common problem when doing carb conversions where either adapter plates are used or new intake manifolds are fitted.
If the engine doesn`t have enough air, the air-to-fuel mixture ratio is off, and some fuel might be left after the spark. This fuel then makes its way through the system and could cause a backfire.
When engine problems occur in an automobile causing the vehicle to misfire, stall, backfire or not start at all, the idle air control is a component that may cause these symptoms.
Backfires
Touching back on air to fuel ratios, a vacuum leak will likely make your engine run “lean” (too much air.) This means the engine cannot efficiently ignite fuel in the combustion chamber. When fuel builds up in the cylinders and combustion occurs, it will expel a backfire.
If your engine is getting more fuel than it needs, a rich fuel to air ratio is the result. When your car has leftover fuel in the exhaust and the cylinders, that fuel explosively burns and creates a loud popping sound.
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I have had two small Coleman ‘Frontier PZ’ propane lanterns for a number of years with no problems. Last year one of them started shutting down for no apparent reason – it would light normally, burn for 4 – 5 minutes and then go out. This summer the second lantern has started doing the same thing. Changing gas cylinders seems to have no effect, nor does a new mantle fix the problem. It’s hard to be certain but as I can’t hear any gas hissing it’s as if the jet gets blocked after a few minutes alight. Turn off the gas, leave the lantern alone for a while and it will relight ok, though it will still only burn for a few minutes before going out again. Any ideas?
ANSWER : There is something in the jets or the piping to the mantels, you my find spider webing there, if you did no cap the port where the tank goes some small friends might have wanted to go camping with you.
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Mule 610 will not start. Was running fine, plowing snow and it starting acting like it was running out of gas and stalled. Put gas in put it won’t start and acts like it is not getting gas. Could the gas line have frozen due to the depth of the snow?
ANSWER : Did you ever find the fix for your mule?
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1974 harley golfcart have to choke everytime I go forward and backfires when going down hill when I take my foot off the gas.
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ANSWER : There is water in your fuel. Drain the tank and flush it out with denatured alcohol. Refill with fresh fuel.
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ANSWER : Back lift arms on 100-90 fiat will go op but will go down very slowly
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My engine revs on high by itself and runs rough
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Yamaha blaster backfire badly
ANSWER : Well i have had the same problem and it was a gear on the right side of the motor. the clip came off and the motor died. i did get it started to get it home but it backfired really bad the entire time. put the gear back on and has ran like a raped ape ever since. hope this helps.
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