1. #1
    Cherokee2004's Avatar
    Cherokee2004 is offline Junior Member
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    4.7l v8 cylinder heads

    Just recently had my V8 cylinder heads resurfaced and installed with new head gasket and new water pump. after putting this all back together the vehicle won't turn over now, not even getting a spark. Any ideas of what I missed or could be the issue now ?


    Any help is much appreciated.

  2. #2
    k-2's Avatar
    k-2
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    Re: 4.7l v8 cylinder heads

    BASICS -
    Wont crank - In P or N -?
    If not cranking it won't spark.
    KOEO
    coils have 12v?
    Injs have 12v?
    CODES?

    Tell what year, vehicle and we can get wiring dia to work from

  3. #3
    Dragon5126's Avatar
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    Re: 4.7l v8 cylinder heads

    first is your static timing properly set?

  4. #4
    Cherokee2004's Avatar
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    Re: 4.7l v8 cylinder heads

    It started now, but dies. Getting 4 error codes of
    P0353, P0354, P0355 and P0358. All ignition coils issues. Highly doubt that they all went bad at once so im thinking a bad connection or fuel pressure issue is causing these codes to come on. Just put back on the heads cylinders and thinking that possibly since the battery was disconnected that could posdibly be an anti theft feature, but doubtful. More leading towards a fuel issue considering the vehicle wasnt running/started in 3 weeks. 2004 Jeep Grand Cherokee Overland V8 4.7 L

  5. #5
    k-2's Avatar
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    Re: 4.7l v8 cylinder heads

    put a fuel pressure gauge on it post PSI.

    Check connectors at coils - tight and is there 12v KOEO?

    You do have a scanner? It is capable of showng ALL codes?

  6. #6
    JPNinPA's Avatar
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    4.7l v8 cylinder heads

    I would verify spark plugs are ok no external arcing marks or damage and the boots are intact. Check the connectors and wires to the coils.
    Also check that all plugs into the PCM are locked and tight.

    Regards,
    JPNinPA

    Sent using TapTalk
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  7. #7
    Cherokee2004's Avatar
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    Re: 4.7l v8 cylinder heads

    The battery was taken out and disconnected for about 3 weeks while the head cylinders were being worked on. Whats the possibility of it being an issue with the PCM and that just needs reflashed ? Checked all the wires, connnections and fuel pressure is fine. Starts, but dies shortly afterwards like the PCM isnt letting fuel in to keep it running. Scanner keeps showing different codes each time as well. Im 99% think the PCM needs reflashed. Any other thoughts ?

  8. #8
    JPNinPA's Avatar
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    Re: 4.7l v8 cylinder heads

    Post the codes


    Regards,
    JPNinPA

    Sent using TapTalk
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

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