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'94 940 turbo. intermittent no start. 900

posted by  anarchyx34 on  Thu Oct 14 05:00 CST 2004
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last visit: Thu Feb 21 03:14 CST 2008
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This actually isnt about my car but another car I'm working on. It's a '94 940 turbo. It first came to me with a crank-no start condition. The fuel pumps were not running. Very reminiscent of a fuel pump relay failure which i've had happen on my own car. I replaced the relay, the car runs, so I sent the guy on his way. Then I got a phone call that the car stalled again and wouldnt restart. 20 minutes later it started. Now, what other relays can cause the fuel pumps to quit? Fuel injection relay?
--
'93 945 turbo. A big comfy box.... and a '90 Mazda 626 GT turbo, 16psi on upgraded turbo and a bunch of other mods.








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    '94 940 turbo. intermittent no start. 900

    posted by  anarchyx34 on  Thu Oct 14 10:15 CST 2004
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    last visit: Thu Feb 21 03:14 CST 2008
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    HAH... Turns out to be the crank sensor. Took the car for a ride, and it finally acted up. check engine light came on and the car died. Started again 5 minutes later and drove back to shop. If I have the car idling, and I tug on the wire going to the crank sesnor, she shuts off. No codes in the ECU though, which kinda surprised me.
    --
    '93 945 turbo. A big comfy box.... and a '90 Mazda 626 GT turbo, 16psi on upgraded turbo and a bunch of other mods.








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    '94 940 turbo. intermittent no start. 900

    posted by  spook on  Thu Oct 14 05:30 CST 2004
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    last visit: Fri Oct 24 08:06 CST 2014
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    Dear anarchy x34,

    Good p.m. and may this find you well. I'll bet the Crank/RPM Sensor - mounted atop the tranny bell housing, just behind the engine, at the 10 o'clock position (as you face the engine) - is failing. The sensor reads flexplate/flywheel rotation, and signals the fuel pumps to keep working, after the 1-2 second fuel pump "spin up", when the ignition is switched "on".

    When the sensor "cuts out", the fuel pump(s) stop(s). In the event of a collision - that stops the engine and starts a front-end fire - rhe RPM sensor signal loss stops the fuel pumps from feeding the flames.

    The RPM sensor wiring deteriorates over time. It is an easy fix, see the FAQs under FEATURES, above.

    Hope this helps. Post back on results.

    Yours faithfully,

    spook








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      '94 940 turbo. intermittent no start. 900

      posted by  anarchyx34 on  Thu Oct 14 05:54 CST 2004
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      last visit: Thu Feb 21 03:14 CST 2008
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      This was something I had considered. But I wasnt getting the priming pulse from the pump when the key is first turned on.
      --
      '93 945 turbo. A big comfy box.... and a '90 Mazda 626 GT turbo, 16psi on upgraded turbo and a bunch of other mods.







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