Backfire

Asked by Sep 18, 2016 at 07:41 PM about the 2001 Chevrolet Blazer

Question type: Maintenance & Repair

Starts up backfires 5 seconds then runs great HELP

1 Answer

21,545

Having timing that is too late (retarded) can cause this same thing sometimes if your engine is running too rich. When the exhaust valve opens, the mixture isn't done burning so it ignites the unburned fuel in the exhaust system and causes a loud bang.

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