Question about 2005 GMC Sierra 2500HD 4WD

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5.7 gm runs rough and back fires through the intake

I have a 2000 2500 gmc and it runs rough and misses and when under heavy acceleration it back fires through the intake... I have replaced the plugs and wires and it didnt help.... What to do??

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  • carhob May 11, 2010

    check engine light must be on,scan for problem code!could be block cat. conv.,or sensor related to timing,code will point to problem area

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I agree with the timing. Your timing is way advanced causing pre-detonation and throwing your flame front and/ or unburnt fuel out through your valves and into your intake manifold. If you have gone off-roading a lot or someone has been beating on your engine or engine compartment while the engine is running your knock sensor will advance your timing to try and fix that. I agree that you should get that thing on a scanner ASAP but I can almost guarantee that you need a timing job and possibly a new knock sensor.

Posted on Mar 12, 2009

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