1989 Pontiac Trans Am Fuel injector Pulse

MRANDELL87

MEMBER
1989 PONTIAC TRANS AM
V8
2WD
AUTOMATIC
236,000 MILES

I have spark. I have power to my fuel injectors but when I crank the car I lose my fuel injection pulse. What do I need to do to fix it?

Wednesday, February 10th, 2010 AT 7:18 PM

3 Replies

JDL

MECHANIC
16,098 POSTS

Hi, check for rpm signal. Use a noid lite on the injector plug, engine cranking, if the lite flashes, you have voltage and ground. Voltage goes hot at key on, computer switches the ground, if there is an rpm signal. Sometimes an issue with ignition module. Check for trouble codes. See if anything shows up?

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Thursday, February 11th, 2010 AT 4:44 AM

MRANDELL87

MEMBER
2 POSTS

Thank you very much for your response. I have already done that and the computer and ignition controle module are brand new. My noid light lights up on both sides of the injector when I crank it. That is where I am lost as to what the problem is.

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Thursday, February 11th, 2010 AT 7:44 PM

JDL

MECHANIC
16,098 POSTS

The noid lite tests both voltage and ground at the same time. You plug it in to the connector. To get voltage on only one leg, you'd have to unplug the other injectors on that bank. I hope I didn't misunderstand your question?

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Friday, February 12th, 2010 AT 9:44 AM