Question about GMC Sonoma

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Cranks backfires it cranks and then backfires

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That could be a timing issues when it back fires
Why ,no idea,not a question you can guess at as we do here
Could also be a vacuum leak & lean fuel mix
When you say cranks the motor turns over nothing else
Cranking has nothing to do with the motor starting or running
You have a no start & back fire as I gather

Posted on Jul 27, 2013


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