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93 burb no start

Discussion in 'General Chevy & GM Tech Questions' started by osgprometheus, Apr 2, 2012.

  1. osgprometheus

    osgprometheus New Member

    I got a 93 burb, 7.4. That has no injector pulse. The Noid lights are not lighting when I test it. The fuse for the injectors has poser going through it. Does anybody have a wiring diagram for the ECM pins so I can test and see if it is pushing poser to the injectors?
  2. dualdj1

    dualdj1 New Member

  3. dipstick

    dipstick New Member

    Check as dualdj1 has said . If module is good need to check the grounds at thermostat housing clean and tight.
    These things will keep injectors from firing if bad. ecm..ign. module...pickup coil... bad connection.

    ---------- Post added at 04:57 PM ---------- Previous post was at 04:35 PM ----------

    www.moates.net/files/6) Miscellaneous Uploads/16168625 PCM - 93 C1500 Pickup 4L60E - Wire Diagram.gif
  4. osgprometheus

    osgprometheus New Member

    Cool. Thank you very much, I'll check those and get back to you if it does/doesn't.
  5. osgprometheus

    osgprometheus New Member

  6. dualdj1

    dualdj1 New Member

    ok so with the key on, you connected the clamp on your test light to battery +, and tapped the purple/white wire on the 4 pin harness with the probe, and got no injector pulse?
  7. osgprometheus

    osgprometheus New Member

    I had a buddy bring over his scan tool. He found no data recieved. We checked the power wires to the ECM. It has some wires not getting power to it. So now it's down to tracing wires... grrrrrr. I hate doing that.
  8. osgprometheus

    osgprometheus New Member

    Anybody know what color wires are supposed to supply power to the ECM. I forgot what my buddy said they were. My first show I am going to miss because it will not be ready. But I HAVE to have it mobile by the 9th of June. Any help would be GREATLY appriciated.
  9. osgprometheus

    osgprometheus New Member

    Last edited: May 8, 2012

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