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No start no injector Pulse ICM is good

Tiny
ZANE MICHAEL
  • MEMBER
  • 1991 CHEVROLET S-10
  • 4.3L
  • V6
  • 4WD
  • MANUAL
  • 180,000 MILES
Okay, so I've spend 4 days on this truck and I'm stumped.
I have good spark everywhere, I changed out the ICM 3 times. Check ECM fuses, but I have no pulse to fuel injectors. Noid light test failed. Bought a new ICM and got a pulse for one start then nothing on the 4 ICM. And now I have no power or pulse to injectors? I've replaced everything but the ECM computer.
Second part of my question is, how would I test ECM? I have it unbolted but still plugged in. Is it still grounded with it unbolted from under the dash?
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Thursday, October 17th, 2019 AT 7:21 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,883 POSTS
Hello,

It is difficult for you to test the ECM but it sounds like you have a shorted injector which shuts down the ECM injector driver. Try to unplug each injector one at a time to see if you can get the injectors pulse back. Please let us know what you find. We are interested to see what it is.
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Saturday, October 19th, 2019 AT 12:50 PM

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