haunted 1989 chevy cavalier

1989 CHEVROLET CAVALIER
214,000 MILES • 6 CYL • 2WD • AUTOMATIC
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BIGGIN69
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  • 2 POSTS
1989 cavalier runs about 25 minutes and then just shuts down. has new coil packs,ign module,ecm,still firing after it shuts down still has correct fuel pressure after shut down,almost new converter,new crank sensor. im running out of idles, please help?
Jun 3, 2011 at 10:47 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
If you're sure that you still have spark and correct fuel pressure, that only leaves injector pulse. Use a noid light to test that. If it's injector pulse that you're losing, that tends to point to a bad ECM. You can try tapping on it when the car is running to see if it responds to that but otherwise, it's going to be a difficult thing to confirm.
Jun 4, 2011 at 5:01 AM
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BIGGIN69
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  • 2 POSTS
thanks for your responese. is a noid light a regulur test light,and where do i test the injector,car running or nor running while testing, car had a new pcm a little over a year ago is there a computer other then the one behind the glove box or do they go out that often. i also know that you have to change out the prom chips in the pcm do these ever go bad. thanks for any help you can give
Jun 4, 2011 at 9:42 PM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
No, it's not a regular test light. A regular test light will damage the computer. https://www.2carpros.com/images/external/1Noidlightpair__.jpg
Jun 5, 2011 at 4:16 AM
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