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Thread: Missfire codes 301 307 1300

  1. #1
    Join Date
    Dec 2007

    Default Missfire codes 301 307 1300

    Good morning well here is what i have so far coils are good new a while back new wires and plugs have checked ohm impedance at injectors all 15 have done a leakdown check cyl 1-3-7 at 5% cyl 3 at 16-17 have checked inlet manifold bolts none loose plugs are a bit black and showed black after a brief run no evidence of a/f in the oil clean and no smoke in the exhaust no overheating cyl 5 did blow into crankcase no sound at inlet or exhaust upper manifold is off at this point as rocker box gaskets were leaking thanks everyone in advance for any replys

  2. #2
    Join Date
    Oct 2014
    Key West, FL


    I would double check the coils, I bet something is wrong there.

  3. #3
    Join Date
    Oct 2011
    Mountains of Western Pennsy.


    I'm having trouble making heads or tails of this info. Do you mean; p0301 (#1 cyl. misfire), p0307 (#7 cyl. misfire), p0300 (multiple random misfires). Sounds like something dealing with the coil packs: wiring problem on the coil packs, high tension lead problems, cross firing on the high tension leads (plug wires).

    '99 Disco II
    '95 R.R.C. Lwb (Gone...)
    '76 Series III Hybrid 109
    '70 Rover 3500S

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