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1990 740 Dies then immediately restarts 700 1990

posted by  gti2120 on  Sun Sep 10 12:02 CST 2017
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I have a 1990 740 wagon 2.3 SOHC Turbo. 234K

The car randomly stalls after it warms up for about 5 minutes. After the stall the car starts right back up and runs until the next stall. It happens while driving and while parked and idling . It seems to increase in frequency as it gets warmer. It can happen while driving in town or driving at 60 MPH . The car is throwing no codes.

I have spent a lot of time on various threads and forums, it seems that this is a fairly common issue but none of the fixes I have read about have fixed it.

So far I have changed :

-Fuel pump relay
-Both fuel pumps
-Fuel Filter

I swapped the Radio suppression/Fuel injector relay with the cooling fan relay.

The car was last tuned up in October ( plugs, wires , d-cap etc..)

Any help is greatly appreciated








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    1990 740 Dies then immediately restarts 700 1990

    posted by  aleekat on  Sun Sep 10 12:09 CST 2017
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    last visit: Fri Oct 24 13:19 CST 2014
    [RELATED]

    What does the tach do when it stalls? Go to zero immediately?
    I'd look at crank sensor wiring. Power stage.
    Sounds like ignition issue.
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    Post Back. That's whats makes this forum work.








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      1990 740 Dies then immediately restarts 700 1990

      posted by  gti2120 on  Sun Sep 10 17:03 CST 2017
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      Tach drops right to zero .

      When it dies , it acts like you were using the key .

      Would a failing crank sensor throw a code ?








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        1990 740 Dies then immediately restarts 700 1990

        posted by  spasske on  Tue Sep 19 07:59 CST 2017
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        last visit: Thu Oct 23 10:11 CST 2014
        [RELATED]

        If the Tach drops before it stalls it is either the crank position sensor and/or the power stage.

        When the Tach drops to 0 it cuts off the ignition.

        Good idea to replace both.
        --
        Paul NW Indiana '89 744 Turbo 180K/ '90 745 turbo 145K








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        1990 740 Dies then immediately restarts 700 1990

        posted by  aleekat on  Mon Sep 11 06:37 CST 2017
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        last visit: Fri Oct 24 13:19 CST 2014
        [RELATED]

        I'm not sure if you have the 2.4 or 2.2 ignition. 90 turbo was the switch over period. If 2.4 then it should throw a code. Look here and here:

        https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm

        https://www.brickboard.com/FAQ/700-900/ElectricalIgnition.htm#EngineCutsOutTachDrops

        https://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm#IntermittentNoStartorNoWarmRestartRadioSuppressionFIRelayRPMSensor

        https://www.brickboard.com/FAQ/700-900/EngineSensors.htm#Crank_Postition_Sensor

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