Engine stalls randomly SL1 1994 manual

Discussion in 'Saturn L-series' started by FeralserF, Aug 26, 2023.

  1. FeralserF


    Aug 26, 2023
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    Hi, I have a 1994 SL1 Manual. The car has had an issue where it has stalled six times randomly over the last few months. Sometimes in hot day weather, other at noght. Since buying, the vehicle always has had an idle that when starting the car would bow slightly up and down around the 750ish rpm mark.

    I noticed three times the stalls occurred shortly after filling gas, other three times no. The car accelerates fine, doesnt overheat, never a check engine light and drives cross country, mountains without a hitch. When I start the car, the fuel pump primes no issues. What could it be?
    FeralserF, Aug 26, 2023
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  2. FeralserF


    Sep 21, 2023
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    Electric Ladyland
    Sounds like crank position sensor CKP.

    What is the resistance across it ( car off or sensor pulled)?

    What usually happens is that the coil inside the ckp develops a crack or discontinuity.

    The problem usually becomes heat sensitive, because as the heat rises, the coil expands ever so slightly inside the ckp and breaks the continuity of the circuit.

    No ckp signal equals no spark and no fuel injector pulses. Engine stops dead.

    30 minutes is pretty much how long it takes the ckp to cool down enough and contract such that the coil becomes continuous again and the car drives like nothing ever happened.

    It's an inexpensive fix to a truly annoying problem.

    If you want to convince yourself, keep a spark plug socket, long extension, and a 3/8 ratchet with you. The next time it happens, carefully remove a plug and ground the electrode and have someone else crank the engine. There will be no spark. Yes you could test at the coils, but that's hard to see during the day.

    Reinstall the spark plug and do not over tighten as the aluminum block is Hot.
    Derf, Sep 21, 2023
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