SPONSORED LINKS

1991 Pontiac Grand Prix 91 GP 3.1 No Injector Pulse

Tiny
MRARCADE
  • MEMBER
  • 1991 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
Hi, my father in law bought this car. It had been sitting for a year or so. Driven maybe once a month. After buying the car it ran for two days then died and will only start once in a great while. It will start with starting fluid and it has fuel pressure. I had the ignition module tested at O'Riely's and it tested good. I have read some posts about similar problems, but have not read many solutions. I have tried 3 different ECM's. All used though. But no luck.

If anyone can provide me with the pinouts of the four ecm plugs so I can make sure it is getting voltage that would be great. I have not tested the injection pulse with a noid light because we don't have an Autozone in town to borrow the noid light.

I am trying to troubleshoot as much as I can without removing the plenum to test each injector for a short.

Thanks in advance for any and all advice!
SPONSORED LINKS
Tuesday, August 25th, 2009 AT 9:39 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Noid light sets are usually $20 or less. But you want to test the injector pulse with a noid light first.

Also check injector fuses.

If injectors are not pulsing, then either a fuse or injector driver in ECM, or wiring to injector harness.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, August 26th, 2009 AT 6:47 AM

Please login or register to post a reply.

Related Fuel Injector Test Content

Fuel Injector Test
GUIDE
Fuel Injector Test
A fuel injector is responsible for allowing fuel into the engine and is controlled by the PCM as part of the fuel injection system. Fuel pressure supplied by the fuel pump...
VIEW MORE

Sponsored links