Question about 1999 Cadillac DeVille

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My sisters cadillac has a check engine P0300 code. I have looked into this but wanted a shorter list of what it could be. Can u help?

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Hello... I don't think there is a shorter list.... The code, as you probably know means the vehicle is having random misfires... There are about 10 things that can cause that based on other symptoms.

Is the vehicle having other symptoms. That may help narrow it down... Also, are there any other codes present....

Good Luck...

Posted on Jun 02, 2010

  • Richard Wilkie Jun 03, 2010

    i got the same problem ,tonite i put plugs and wires in her and the code came back,,and i had a brokem plug and a vaccum leak take the motor cover off and look for a vaccum leak

  • Thomas Johnson Jun 03, 2010

    At this point of finding the vacuum leak, using some starter fluid, spray around vac hoses and lines and gaskets see if the engine rpm's change. If it does, that is where the leak is...

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Posted on Jan 02, 2017

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How To Fix P0300 random misfire codes in your car ...

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Read more at: http://www.obd-codes.com/p0300
Copyright © OBD-Codes.com Autolite Challenge Series P0300 Engine Misfire Diagnosis

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