Question about 1990 Nissan 300ZX

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Check engine light goes on and off, when is on runs like sh$%!!

I think one of the injectors is bad

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  • maxbond55 Apr 19, 2009

    My engine light goes on and off too. When i drive and get to 4-5 RPM the car sorta chokes and lets out bad smells..

  • yadayada
    yadayada May 11, 2010

    does it miss?

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  • 59 Answers

Could also be O2 sensor, or EGR system

Posted on Oct 10, 2009

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No pulse means the injector ground side is absent, since you have power to the injectors. The ground wire goes into the engine computer to be internally grounded for the pulse. You can test the injector ground side with a test light, as a verification of it not having pulse. If it really has no pulse, but it has correct voltage to the injector solenoid, then you have a bad injector, or a bad ground wire to the pcm, or a bad pcm.

Use a test light with a ground clip and a needle-type probe. Unplug the injector connector and note which is the power wire terminal and which is the ground wire terminal. Clip the test light lead to the POSITIVE battery post, and put the probe into the injector's ground wire terminal. Now have someone crank the engine over and watch for a blinking light on the tester. If you have a blinking light, the injector ground side is working right, so check if voltage to the injector is correct, or if you have a bad injector. If you have no blinking light, then no pulse is correct. You will need to check the ground wire to the computer before assuming a bad computer. I think they are called quad drivers inside the computer that control the injector grounds.

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so i think you have fuel injectors problem ??
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WITH MY BEST WISHES

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