Question about 1999 GMC Sonoma

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Gmc 4.3 won't start and backfires

Gmc 1999 sonnoma 4.3 won't start and backfires. was hard to start now can't start

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If this engine has a distributor, the clamp bolt that secures it to the engine may be loose and that allowed the unit to turn which changed the ignition timing. If you can turn it by hand you will probably need to re-time it.

Posted on Sep 26, 2009

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Sounds like you may have a crank sensor or a ignition module,or pickup coil gone bad,you should use a scan tool to look for cranking RPM's,or pull your distributor cap and look for a green corrosion on the pickup coil wires at the module.

Posted on Sep 26, 2009

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1 Answer

Have a 1999 Kia Sportage that won't start. Have changed Head gasket and set timing. Have also check to see if getting spark and am getting spark. Will crank but won't start.


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