Re: Severe Misfire
Posted: Sun Nov 13, 2011 1:14 am
Well a crack in the exhaust manifold will certainly cause a back fire but I fail to see why it would cause a severe misfire, it wont improve the running of the engine as exhaust systems are designed to extract the burnt gasses as well as silence the car.
The engine is not taking air in through the exhaust valve on the exhaust stroke but expelling burnt gasses, the back fire is caused by air getting into the exhaust system through the crack in the manifold but air is not drawn into the combustion chamber.
You could run the engine with no exhaust system on and it should not misfire but it will be hell of a noisy.
Is the engine actually misfiring or is it just the impression you are getting because of the backfiring?
The engine is not taking air in through the exhaust valve on the exhaust stroke but expelling burnt gasses, the back fire is caused by air getting into the exhaust system through the crack in the manifold but air is not drawn into the combustion chamber.
You could run the engine with no exhaust system on and it should not misfire but it will be hell of a noisy.
Is the engine actually misfiring or is it just the impression you are getting because of the backfiring?