Question about 2001 Pontiac Grand Am SE

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Backfires on decelleration 2000 to 3000 rpms only no codes

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Egr system not functioning properly, vacuum leak, intake air vacuum leak.

Posted on Oct 05, 2009

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MY 1968 MOPAR STUMBLES UPON ACCELERATION AND BACKFIRES ON DECELLERATION.


have you checked the timing chain for wear because if the chain gear has chipped it can cause that to happen, some of those chains are made of plastic Teflon and they can brake off so I would look to see if that might be the problem, or recheck the points and the timing.

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run the fault codes
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Backfire


one of the cylinders is missing. It doesn't fire sometimes and when it does, you get the backfire. Check the plugs. It should be obvious which cylinder is at fault.

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Backfiring on throttle-closed decelleration is usually caused by cold air being sucked into a hot exhaust systen. Check for poor seal where the downpipe meets the cylinder head, and leakage at any joints beneath the engine if it has a balance pipe. Hope that helps.

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if is doing it thru the carb then the fuel mixture is too lean, if is in the exhaust (also called after-fire) the fuel mixture too rich.

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EGR Valve!
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check ur plug wires they might be mismatched ...joe

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