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Thread: help. 6.0 p0300

  1. #1

    Default help. 6.0 p0300

    hey i have a 2500hd with the 6.0 and i am getting a p0300 and p0200 code. i have put new wires and new coils on as well as tested all the fuel injectors and they all pulse and drop 20 psi when pulsed. any ideas would be great thanks

  2. #2
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
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    Did you also replace the spark plugs to try & cover your P0300 code? What type of plugs do you have in it?
    For your p0200 code did you circumvent the controll to pulse the injectors? How did you check them
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  3. #3


    Definitely new plugs. AC Delco gapped at .040".

    Have you cleaned the MAF? Are you running a K&N?
    When you hear hoofbeats, look for horses not zebras.

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