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Thread: 02 Sonoma MAF

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  1. #1

    Default 02 Sonoma MAF

    I have a 02 Sonoma 4.3l, and its throwing the dreaded p0300 code :/ I have rebuilt the motor and replaced all the ignition components and its still giving the p0300. It threw the MAF code 1 time, I cleaned it and cleared the code and it never came back. But I'm wondering if it may be faulty but not throwing a code ? The only thing that puzzles me is, when i watch it with an OBD II its cylinders 1 & 4 that misfire and every once in a while another cylinder will mis once or twice? any ideas or imputs ? thanks!!

  2. #2

    Default

    Misfires on warm up or still misfires after the engine is running at operating temp?

  3. #3
    Jr. Engineer Jamm3r's Avatar
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    Dec 2012
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    Default

    What do the fuel trims look like?
    Minneapolis area - 1997 K2500 regular cab long bed + 8.5' Western Unimount plow + modified transmission + 2nd battery + modified camper charge circuit + 1971 Cayo camper -and- 2004 4x4 Suburban 2500 8.1 + Maxbrake controller + 2nd battery + modified trailer charge circuit + Reese receiver, pulls 30' Airstream trailer

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