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Thread: Puzzling backfire

  1. #1
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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.
    You can pour syrup on poop but that don't make it pancakes

    1982 Sea Nymph Bass Attacker with 40 Evinrude
    1999 Lowe Lake Jon with 9.8 Merc

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    Cray is offline Crappie.com Legend and Moderator of the Mechanics Forum * Crappie.com Supporter
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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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    You can pour syrup on poop but that don't make it pancakes

    1982 Sea Nymph Bass Attacker with 40 Evinrude
    1999 Lowe Lake Jon with 9.8 Merc

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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.

  6. #6
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    Fixed now. Crank position sensor took care of it. Thanks all!
    You can pour syrup on poop but that don't make it pancakes

    1982 Sea Nymph Bass Attacker with 40 Evinrude
    1999 Lowe Lake Jon with 9.8 Merc

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