Question about 1999 Saturn SL

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Engine shuts off when it gets warm

99 Saturn SL2 idles and runs great. No OBD2 codes present. After about 5 minutes will suddenly stumble and die. At this point there is no spark at any wire. Someone recommended changing module--that worked for about 1/2 hour before it died. Coolant sensor--no fix. Tried to follow Haynes manual recommendations for checking module and crank sensor, but all it lists is the wiring diagram for up to 95 which has 2 plugs. I can't find diagrams or suggestions for single plug module.

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  • redpegra Feb 08, 2009

    my 2001 cavalier is doing the same thing starts and runs well for about 5 minutes and then just shuts down....after it cools back down it will start again....we have changed the fuel pump and the a fuel sensor....neither helped.....help!!!!!!

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Try crank position sensor, it's common for those to stop working when they heat up

Posted on Apr 17, 2009

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Ignition switch possibly?

Posted on Jul 12, 2008

  • Richard Borders
    Richard Borders Oct 09, 2013

    wiring behind fuse box inside car is the problem seen it plenty times

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After warming up, the rpm is normal range.


Engine stalls cold or RPM fluctuates at idle up and down or dies near idle.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.

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