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Thread: Interesting but weird issue

  1. #1
    Join Date
    Oct 2004
    Posts
    1,553

    Default Interesting but weird issue

    So I have my 1990 300zx tt running but notice a slight miss. I used consult to do power balance test and notice a small drop each time it cuts a cylinder it will say 200rpm or something but my cylinder 2 will say 19-35. I took the spark plug out and they are brand new and I see its firing but running a tad rich just curious what could it be? It's firing but maybe not getting a good spark or not enlighten power?
    Last edited by superspeed; May 25th, 2016 at 10:54 AM.

  2. #2

    Default

    Start with:

    1. Swap coils with another cylinder and see if the problem moves to rule out the COP.

    2. Remove injector connector and look for green death, check resistance of injector.

    3. Do a compression test.

  3. #3
    Join Date
    Oct 2004
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    Default

    Also driving i notice it happens in lower rpm when i WOT its smooth just lower 3k rpm?

  4. #4
    Join Date
    Feb 2009
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    1,761

    Default

    At WOT your alternator/battery might have slightly more stable voltage due to the increased RPM and a slightly better spark, might be worthwhile to stop at battery world or somewhere else and have them do an electrical scan.
    Model View Caffeine

  5. #5
    Join Date
    Oct 2004
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    Default

    i hear like a slight belt squeek could tiny bit of slack cause this issue?

  6. #6
    Join Date
    Apr 2011
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    4,866

    Default

    Sorry, but what type of Z from the approximately 40-year span are you talking about?

  7. #7
    Join Date
    Oct 2004
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    Default

    1990 300zx tt

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