Z32 Missfire possible ptu issue

Discussion in 'Technical' started by zedkelly, Jun 10, 2019.

  1. zedkelly

    zedkelly New Member

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    Hey hows things?

    Got an 1990 na
    I'm just wondering if posible missfire issues on one Cylinder could be a PTU issue.

    -compression is fine on that cylinder
    -injector looks to be working
    -seems to be getting some sort of power on the coil plug

    Thanks
     
  2. rob260

    rob260 Moderator Staff Member

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    If you are missing spark the PTU is a possibility. If you have a logic probe you can test pulse signal to verify.

    Where are you located?
     
    Last edited: Jun 10, 2019
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  3. zedkelly

    zedkelly New Member

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    I'm in Sydney . I Guess i would need a logic probé? I tested with a multimeter but maybe thats not enough right
     
  4. zedkelly

    zedkelly New Member

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    Is there any way to specifically test the PTU
     
  5. IB

    IB ?????

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    ECU usually throws a code 21 when PTU drops a cylinder.
    See tech section for how to do an ECU diagnostic.
     
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  6. zedkelly

    zedkelly New Member

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    Oh cool thanks Will do
     
  7. ZcrazyZx

    ZcrazyZx New Member

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    Its common on old style PTU's and usually wont throw an error code, if you've got a series 2 PTU then its pretty unlikely to be the problem, here's a diagram on testing it to be sure. Have you ohm tested the injector on this cylinder? Also pull your fuel pump fuse and ground the coil/plug while cranking to verify spark.
    EDIT: Here's a link to the post, the picture's clearer than mine https://forums.nicoclub.com/dead-cylinder-can-t-figure-out-why-read-me-s2-ptu-test-t564452.html
     

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  8. rob260

    rob260 Moderator Staff Member

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    A multi meter is too slow to catch a pulse signal.

    If you want to bring it up Hornsby way I’m pretty confident I could a diagnosis for you.
     
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  9. zedkelly

    zedkelly New Member

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    hello peeps

    was having trouble logging in but now fixed thanks to rob
     
  10. zedkelly

    zedkelly New Member

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    tried to start the car today, and first crank going well at full power, still didnt start, so I tried again, and nothing

    fuel pump is priming, no clicking relays nothing, what could this be now?
     

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