1989 Pontiac Grand Am cranks wont start

Tiny
KINGIAN71
  • MEMBER
  • 1989 PONTIAC GRAND AM
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
I know there is no injector signal but the car starts when I prime the intake, what would make the injectors not fire? Fuel psi is great oil psi is great with new sender unit. I cant find a mechanic in my town that can fix it. This car is for my daughters 16th b-day next month please help me. Thenk you guys foe a speedy reply on my last entry.
Sunday, February 28th, 2010 AT 9:05 AM

7 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hi, with the key on, do you have voltage at the injector plug. The computer controls the injector on the ground side. Without the rpm signal, no injector pulse. The rpm signal comes from the crank sensor, dis ignition. Any trouble codes?

If you had a recent post on this vehicle, if you stay on the original post, the person you were talking to will receive an e-mail notice of your post, but, I'm glad to help anyway I can?
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Sunday, February 28th, 2010 AT 9:18 AM
Tiny
KINGIAN71
  • MEMBER
  • 4 POSTS
I checked and I have 23v at the injector plugs does that mean that the crank sensor is bad?
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Sunday, February 28th, 2010 AT 1:42 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
23 volts is way too much, should be battery voltage. With key on, maybe 11 volts.
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Sunday, February 28th, 2010 AT 2:00 PM
Tiny
KINGIAN71
  • MEMBER
  • 4 POSTS
My bad blond moment I missread the meter its actually 23mv at the injector plug.
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Sunday, February 28th, 2010 AT 2:08 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hi, you need to have the setting on voltage not mv. If that reading is correct, the voltage isn't correct. Take a reading across the battery posts, key on, no crank. Then take a reading at the pink wire with black tracer at the injector. The reading should be close to the same.
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Monday, March 1st, 2010 AT 9:03 AM
Tiny
KINGIAN71
  • MEMBER
  • 4 POSTS
Ok first thank you for your time. Their is no voltage with the key on at the injecter plug. Computer? If so why will it run after I prime the intake? Crank sensor? Seems more likely but I just don't know.
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Monday, March 1st, 2010 AT 4:30 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
What is litre size of engine? Voltage at the injector comes from a fuse, not the computer. If no voltage with key on, check fuses. The injector voltage wire on some, start as pink/black, then may be red at the injector.
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Tuesday, March 2nd, 2010 AT 9:06 AM

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