HELP !! Fuel/boost cut

Discussion in 'Z31/Z33/Z34 and Other Technical' started by Brenton31z, Jul 29, 2018.

  1. Brenton31z

    Brenton31z New Member

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    Help is needed I have done a lot of research and still can not fix this problem.
    Quick run down
    I have a 1986 z31 turbo was originally auto previous owner converted to manual and removed aircon. I am getting fuel/boost cut when ever the car hits positive boost. I have replaced all vacuum lines thinking this would be the problem. But no so
    I have done a code check and codes 13,23,24,31,41
    I have fixed code 13 with new C/T sensor and replaced the harness. Code 23 I have tested the continuity on the TPS and it reads fine I move throttle cable a little and it opens. (Do I still need to replace ?)
    Code 24,32,41 I’m not worried about as code 24 would be because of the auto to manual conversion code 32 I don’t have aircon and 41 I have after market fuel pressure gauge.
    I am lost where to go from here, all I can think is to replace the ECU but I just don’t want to be spending money for no reason. I do smell a little burning smell from ECU but apart from that I really don’t no.
    Any help would be much appreciated
     
  2. East Coast Z

    East Coast Z Well-Known Member

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    The first thing you need to investigate is................
    "I do smell a little burning smell from ECU".

    The second thing you need to investigate is................
    "Code 23 I have tested the continuity on the TPS and it reads fine".
     
  3. Brenton31z

    Brenton31z New Member

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    Okay so you are saying replace both of them ? Could this be the cause of the fuel/boost cut ? I didn’t think the TPS had anything to do with boost/fuel
     
  4. East Coast Z

    East Coast Z Well-Known Member

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    I didn't say to replace anything.
    I'm probably the last one on the forum that would recommend replacing anything unless fault diagnosis provides evidence the item is not working correctly.

    What I stated was you have identified two issues.
    Number one is, "I do smell a little burning smell from ECU".
    This is not normal, if you choose not to investigate this issue any further, what can I say?

    Number two is, "Code 23 I have tested the continuity on the TPS and it reads fine".
    Here's a question.
    If a fault code #23 was logged & you tested the continuity & it reads fine.
    Why was the fault code logged?
    Something has triggered it & that's what you need to diagnose.

     
  5. Brenton31z

    Brenton31z New Member

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    Okay thank you, I will be trying to work it out on the weekend wish me luck.
     
  6. Brenton31z

    Brenton31z New Member

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    So over the weekend I replaced the fpr hoping this was the problem but no.
    I think my ecu is fine smell has gone and it is reading fault codes. I’m assuming the code for the tps is coming up is because it has been changed to a manual so it still has the automatic wiring loom.

    Any ideas to solving my problem would help thank you
     
  7. East Coast Z

    East Coast Z Well-Known Member

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    "I think my ecu is fine smell has gone and it is reading fault codes."
    What are the fault codes?
    "I’m assuming the code for the tps is coming up is because it has been changed to a manual so it still has the automatic wiring loom."
    Making assumptions is a great way of not diagnosing problems correctly.
    You need to gather evidence to confirm a component or circuit, is operational or defective.

    You have a theory relating to the TPS code being logged.
    Possibly the place to start in putting your theory to the test, would be to compare the TPS circuit diagram between an automatic & manual vehicle.
     

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