Deceleration Backfire
Okay, some of you know that I am curious about my local trusted mechanics' conclusion that backfiring on deceleraton almost HAS to be caused by an exhaust leak. I spooged (technical term) high-temp RTV on both sides of the final three exhaust gaskets on my car. These three gaskets touch the CAT. There is just one gasket, besides the ones against the heads, that I have not touched, and that is the one before the crossover pipe.
the popping and snapping on deceleration did not change at all. I see that an exhaust leak may still be present at the start of the crossover pipe, causing this. Okay.
But my feeling is that an exhaust leak at the head would spit all the time (like other intake manifold leaks I have had on other cars), so I am not ready to conclude that there is a leak there.
So, here's my curiosity: Do you think my broken head stud is allowing air to get in, causing the decel popping and snapping?
One more thing: occasionally (about 1/5 of the time) the engine makes a single loud SNAP just before it fires on startup. Do you feel this is related?
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'83 SC
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