Question about 1990 Pontiac Grand Prix

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Fuel injectors have power for about 5 cranks then go dead

I've got a 90 pontiac grand prix. It will fire then die. we put a tester on a fuel injector and it lights up for about five cranks then there is no power to the injector. The test light starts out bright and gets dimmer with each crank of the engine.

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  • fisheadfishe May 25, 2009

    I'll give it a try, thanks!!

  • Anonymous Mar 22, 2014

    engine fires but the injectors are not working

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  • Pontiac Master
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Mass air flow sensor.

Posted on May 25, 2009

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My 89 Grand Prix with a 2.8 just dies going down


Sounds like a bad fuel injector. Back in the day we would let them runout in the parking lot and when they stalled we would rip off the intake plenum as fast as possible and ohm check the injectors. They should be around 13 ohms. If they are significantly less, say 3 ohms, than those injectors are bad. This system bank fires the injectors. Meaning that all three injectors on the front back fire at the same time and all three of the injectors on the back bank fire at the same time. If one injector hoes bad it will shut down the whole bank which will stall the engine.

Sep 11, 2014 | 1989 Pontiac Grand Prix

1 Answer

1999 pontiac grand prix lost power on highway n now it wont start


Fuel Pump ?
You checked that (fuel pressure)

Check anything at all

Spark
Injector Pulse
Dead Battery
Ignition Switch
Failed Ignition Module

Aug 11, 2014 | 1999 Pontiac Grand Prix GT

1 Answer

I have a question about my 92 Grand Prix 3.1 with 70,000 miles. I recently replaced the fuel filter and now, I'm not able to start the car. It cranks, but will not fire up. I've noticed that I'm not...


Good fuel pressure, but none to the cylinders? Check the injector circuit. All injectors will have battery voltage to them with the key on. A "noid light" can be used to check both power and ground. The light should be blinking when the engine is cranked. Noid lights are cheap, and just plug into an injector connector. If it blinks with the engine cranking over, the circuit is good-both power and ground.

Jul 14, 2014 | 2002 Pontiac Grand Prix

1 Answer

Ok on my 98 Chevy s10 I've pin pointed down to the


If you can make the injector click without cranking the engine, the injector ground circuit is bad, probably the computer.
If the injector only clicks when cranking, the ground circuit is working right, so the problem is with the injector drive circuit. There should be a fuse for the injectors in the power distribution box by the battery. Have you checked for that? Also check for power to the fuse with key on. Use a testlight or voltmeter to check for power.

Nov 08, 2012 | Cars & Trucks

1 Answer

No power to the injectors



No injector pulse at injectors:
a) check fuses
b) use scan tool to read RPM at PCM while cranking. Ask question specifying RPM PID data.
c) crank sensor/cam sensor/ign. module/wiring fault
d) stuff not plugged in properly
4) check fuses
5) dead PCM note PCM pulses injector ground based on sensor input, power is constant from ignition
how are you testing injectors theres something called a noid light auto parts store let you use them free you have to test it on the injector itself what did you car do before it died does it turn over but not start

Dec 03, 2010 | 2002 Pontiac Grand Am

1 Answer

My grand prix jerks around 80 km/h. Also it jerks when trying to accelerate at times. This problem is intermittent at the moment. This problem started after the mechanic worked on an oil pan leak, front...


Did he weld it? If so, did he disconnect the battery?

I had a 1990 Cadilac Devile that jerked around 35 mph and it was missing on a cylinder because the fuel injector was not firing.

I wonder if this is happening to yours.

The solution, in my case, was another ecm because the old ecm was not firing the fuel injector.

You can check this by using a fuel injector tester that lights up or by listening to the fuel injectors click with a stethoscope.

Jul 16, 2010 | 1998 Pontiac Grand Prix

1 Answer

Car spins over but will not start 1999 Grand PRIX GT


If its injection you need to test light injector leads and see if you are getting fire there. There also should be fuses for the injectors too, there is a fuse box under hood wear them fuses are located.

Feb 11, 2009 | 1999 Pontiac Grand Prix

1 Answer

1988 Pontiac Grand Prix will not fire at all


more than likely ur injectors are malfauctioning run some chevron techron injector hope theyre not completely bad

Jun 02, 2008 | 1988 Pontiac Grand Prix

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