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Injectors not firing?

Tiny
MK4FABIAN
  • MEMBER
  • 1991 CHEVROLET TRUCK
  • 2.8L
  • V6
  • 2WD
  • MANUAL
  • 104,000 MILES
My 1991 Chevy S10 Tahoe's injectors are not firing, and I still do not know the cause. So far, I've replaced the ignition control module, fuel pump/relays/tank/filter, throttle body, and every fuse possible in the truck. I have also checked my injector connectors using a Noid light and both are good. My next best guess would be the ECM, ignition coil and/or a wiring issue with the distributor. What are some possible reasons that in still getting no fuel?
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Monday, July 31st, 2023 AT 8:23 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,054 POSTS
I have seen the injector short out causing the injector driver inside the PCM to lock up and not produce a pulse. You can be sure by doing an OHMs test across the injector windings. it should be about .20 ohms, or you can disconnect one of the injectors at a time to see if the pulse returns. We should run the codes as well.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

and

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please go over these guides and get back to us.

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Tuesday, August 1st, 2023 AT 12:48 PM

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