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Thread: Puzzling backfire

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    silverside's Avatar
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    Default Puzzling backfire


    2001 Buick 6cyl. Car was running fine. On starting it tried to start but backfired hard enough to break the pcv valve/ pressure sensor mount. The same continues each time we try to start it. I looked for a vac line problem but found none. Any ideas? EGR? Only code set was for cyl 1 misfire and evap vent.

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    If it has a timing belt it could have broke or jumped. Or it might be crank position sensor. Usually with the sensor though they usually just won’t start but crank over.
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    Again with cray , Timing belt jumped.


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    I will check it out Saturday and let you know the results

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    Quote Originally Posted by partsman1 View Post
    Again with cray , Timing belt jumped.


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    Those don't have a timing belt. They're pushrod engines with a short timing chain that is not likely to fail, although it is a possibility.

    They had some common intake gasket leaks, as well as failures with the ignition control module. CKP is a possibility as well, but there's no way to diagnose it online.

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    Fixed now. Crank position sensor took care of it. Thanks all!

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