Code P0300 and lots of white smoke - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-31-2014, 11:33 AM   #11
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I guess the only way to know for sure, is a f/p test.......does it hold? If it doesn't then you clamp off the supply and return, after, turning key to on to get max pressure( if it has rubber fuel lines) and see if the pressure holds....if it still drops quickly, then an injector is leaking.....another possibility, is a rub though condition on the control side of the injector circuit, that is grounding the injector to stay open....rare....but I have seen it once in my lifetime....

If you have raw fuel in that cat, you can just about kiss it goodbye....
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Old 10-13-2014, 07:41 PM   #12
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Sorry I forgot to update with what happened. I took the injector rail off and pulled the number 5. I could blow straight through the thing! It must have collapsed or stuck open. It the first time iv seen this, but i replaced it and it runs great again. Took awhile to burn the smoke off though. Guess ill be building a new exhaust this winter, i doubt there'* much of the cat left!
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Old 10-13-2014, 07:43 PM   #13
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Glad you were able to find the problem, I hope it continues to run good for you!
Thanks for updating us with your findings.
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Old 10-18-2014, 11:55 PM   #14
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Hope you changed the oil and filter.....

Yeah, raw fuel into a hot cat, is not good....surprised it didn't "lock" the engine.....
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