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"Engine Timing Off" - If the timing is off, the spark from each spark plug will occur when a valve is partially open. This can cause the combustion of the air/fuel mixture to partly occur in the exhaust manifold (i.e. backfire) and the sound will thus be heard through the tailpipe.


Typically, a backfire takes place when one of the above explosions occurs outside your fuel cylinders. Some backfires travel back up the intake valve while others spill out through the exhaust system — causing a type of backfire known as an “afterfire.” Afterfires can sometimes result in visible flames shooting out of the tailpipe.


June 24, 2019. An engine backfire occurs whenever the air-fuel mixture in your car combusts somewhere outside the engine's cylinders. This can cause damage to your car's exhaust or intake if left unchecked -- and it also means that your car's engine isn't making as much power as it should, and is wasting lots of fuel.


Why do Engines Backfire? Reason #1: Bad Engine Timing. An engine backfire is what occurs when the combustion event takes place outside the engine's combustion cylinders. Inside each cylinder, fuel and air are mixed in a precise ratio at the exact right time. A spark ignites the entire mixture, and the resulting explosions are what power your car.


Afterfire occurs through the generator’s exhaust and is due to a lean or rich air-fuel mix, a timing issue (late combustion), or a stuck exhaust valve. In this article I’m going to talk about what causes backfire and afterfire in a generator, if they can damage your engine, and how to fix them.


The engine backfire through the exhaust ONLY and not all the time either ! Backfire through the driver side on the number 5-6-7-8 cylinders . The passengers side fire OK I think and gets hot on the headers and muffler like normal . NOW the drivers side exhaust is cool and the exhaust gasses are cool coming out the exhaust !


What causes an exhaust backfire when you let off the pedal....the crakling and so on.... reson is that i have a 355 with sportsman II's and XE268 i will be running Hedman 1 5/8 primary headers to a 3" collector I want to run a dual 3" system with and X-pipe, flowmaster 40's and turndowns at the...


Backfiring through the muffler or carb? Makes a difference as to how to proceed. I’m thinking valves not closing properly or carb running rich. When you post back include the model and spec numbers, I’m think either an HH80 or HM80 engine. Waiting to hear back.


My 305 is backfiring through the exhaust and skipping when I drive it, sounds fine at idle. When I rev the engine to about 2000 rpm it starts to pop and backfire.


Briggs and stratton then replaced the engine after two years of fighting with them and more than $1000.00 spent on their part. The new engine has only 5 hours on it and is now backfiring thru the exhaust, but has not spewed gas out of the carb as of yet. Contact the U.S. Consumer Protection Commission in Washington and report this to them.