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Serious Misfire, Please help

Discussion in 'Stock 2002 - 2005 Explorers' started by Hixc, January 18, 2020.

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  1. Hixc

    Hixc New Member

    Joined:
    January 18, 2020
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    City, State:
    Ashtabula, Ohio
    Year, Model & Trim Level:
    2004 Mercury Mountaineer
    I have a 2004 Mercury Mountaineer 4.6L V8. I have a code for P0354 that comes up for ignition coil D. I have a multimeter and have tested the COP Harness connector and do not get a 12v signal. However i get a 12V signal on the other 7 Plugs. I have also tested for continuity between pin E35 on the PCM side to the COP Harness and checks out good. I have also checked for resistance and get a reading of 0 ohms. So i jumped a wire from the battery to get a 12v Signal to the COP harness and was able to get the plug to fire and pulse. However when i do that, my check engine light flashes and gives me a whole new mess of codes.
    P2110
    P0122
    P0223
    P0403
    P0406
    P2100
    P2106
    P2107
    B1600
    B1681

    When i unplug the COP, these seem to go away. however now i have codes for
    P0354
    P0316
    P0302

    I have replaced every sparkplug and every single ignition coil 2wice.
     
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  3. TechGuru

    TechGuru Well-Known Member

    Joined:
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    Location:
    Texas
    Year, Model & Trim Level:
    2003 XLS 4X4 4.0L FLEX
    I don't have a V8 but the general first troubleshooting method I'd heard for COP vehicles is to swap the COP with another plug and see if the problem moves to the other plug or not to determine if the COP is the problem...
     
  4. Trollslayer

    Trollslayer New Member

    Joined:
    June 7, 2018
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    Location:
    Heart of Dixie!
    City, State:
    Saraland, AL
    Year, Model & Trim Level:
    2003 4.6 Eddie Bauer
    Make sure the little plastic clips that hold the connectors are tight.
     

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