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My 1967 327/300 has just started backfiring thru the exhaust on acceleration only. It seems to be confined to the left side of the exhaust system. Any suggestions as to where I look--fuel (seems OK),timing, condenser,exhaust valve spring?? I was on my way to a club event this morning and had to turn back as the car was undriveable, was I embarassed to show up in a Cavalier!
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Re: C2 Backfire Thru Exhaust
The correct term is "afterfire". Backfire is when it spits back through the carburetor.
The first step would be a compression or leakdown test as this condition is commonly caused by a burned valve especially if it only occurs on one bank. If the compression/leakdown numbers are okay the ignition system should be thoroughly inspected and tested including the spark plug wires.
If both the above prove okay, the carburetor is suspect.
Duke -
Re: C2 Backfire Thru Exhaust
Don,
You haven't been messing around with the spark plug wires and accidentally got two of them switched, have you?
A broken valve spring might also be a possibility, but you should find that when you perform the leakdown check that Duke is suggesting.
Good luck,
GeneComment
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