I own a Nissan 300zx Z31 1985, a car which has been having the same recurring problem almost a dozen times now. I am usually able to fix this issue, however the fix is never successful permanently. This time I cannot fix the issue. The car runs and drives but will always die aprox. 47 seconds after starting it. It seems that once the fuel pump stops priming fuel to the engine and shuts off, the car stutters and dies very shortly after. Usually I disassemble the Mass Airflow sensor line from the air filter to the engine and make sure everything is tight and secure, and it often works for a few weeks before I have to do it again. I have tried to find vacuum leaks using Starter fluid however I have been quiet unsuccessful. I have swapped out the following in order to try and fix this problem: - Mass Airflow Sensor - Air filter - Fuel filter - Fuel Pump - Spark Plugs - Throttle position sensor - All ignition/spark plug leads - Hose clamps - Some older hoses (vacuum lines, fuel lines & coolant lines)

I'm unsure at the moment as to what I can do to fix my vehicle and I am very interested in finding a permanent solution to this problem. I cannot take this vehicle to a mechanic as I would have to navigate heavy traffic with a car that stalls every 47 seconds.

Any help and advice would be most greatly appreciated.

Thank you for reading!

Kind Regards, Kail M.

Edit: ECU displaying error code 31 (Load Signal Circuit) and 23 (Throttle Valve switch). Any help is greatly appreciated

  • Take it to a mechanic on a trailer.
    – Solar Mike
    Jan 17, 2019 at 5:24
  • Managed to take it to the local mechanic, who could not pinpoint the problem. Their suggestion is to take it to the next town over to have an auto electrics expert to take a look. It's not worth the hassle of paying $200 to get it towed to the next town and then having no way to get back to it Jan 17, 2019 at 7:40
  • check fuel line for blockages,
    – Jasen
    Jan 17, 2019 at 9:20
  • Have you read the codes? It does have an ECU, here's a site that shows how to do it. Also, have you checked the fuel filter and your tank vent?
    – GdD
    Jan 17, 2019 at 10:33
  • 2
    I don't know the answer but my gut feeling is the fuel pump relay. If feels like the problem is that the fuel pump only runs when the priming circuit is live. If it were mine, the first thing I'd try would be to hard-wire the fuel pump and see if it run for longer than 47 seconds in that configuration. Jan 17, 2019 at 11:02


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