1989 Pontiac Grand Prix No Injector Pulse

1989 PONTIAC GRAND PRIX
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DEAN STREY
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  • 1 POST
replaced cps,ecm,icm,unplugged tps, still no injector pulse. when i replaced the ecm with a used part it fired up one time and then nothing again after that. tried 3 other ecms, 2 of them ran in other cars. IT HAS SPARK BUT NO INJECTOR PULSE????????
Jan 7, 2007 at 7:58 PM
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CARUNDELL
  • ✓Experienced Mechanic
  • 602 POSTS
[quote:d113802d87="dean strey"]replaced cps,ecm,icm,unplugged tps, still no injector pulse. when i replaced the ecm with a used part it fired up one time and then nothing again after that. tried 3 other ecms, 2 of them ran in other cars. IT HAS SPARK BUT NO INJECTOR PULSE????????[/quote:d113802d87]

Hey dean,
Lets get back to some basics, verify good ground for each injector, verify each injector has adequate 12v supply voltage. Get back to me!

Chris
Jan 9, 2007 at 7:17 AM

Suggested Repair

Verify a good ground for each injector and confirm each injector has adequate 12-volt supply voltage.

Conversation Summary

The owner of a 1989 Pontiac Grand Prix 2.8L reports spark but no injector pulse after replacing the crankshaft position sensor, ECM, and ignition control module and unplugging the TPS. A used ECM started the car once, then it would not run again. The expert advises checking injector grounds and 12-volt supply voltage.

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