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Re: 97 Blazer dist question.
Clarify something for me: You mentioned "backfire", a backfire occurs in the exhaust. A "backfire" through the intake is called induction. Two different symptoms, completely different diagnosis procedures. Which are you experiencing?
There may be a vacuum leak, (internal or external) with the intake gasket, or possibly a leak in the air inlet between the MAF and the throttle body. Either scenario will cause a lean condition which can cause induction. Depending on where and how large the leak is, it may or may not set a DTC. The OBDII system does not monitor secondary ignition, fuel delivery, or base engine mechanical problems.
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