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Crank no start?

Tiny
LOUD_8.1VORTEC
  • MEMBER
  • 2004 CHEVROLET SILVERADO
  • 8.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Hello,

I have 62 PSI of fuel pressure and I have sparks and also a good compression 190 PSI the only one is that I have pulses of only 6 volts to injectors with no resistance in the wires between injectors and PCM. The complete harness is okay. All truck fuses and relays are okay. The crank and cam sensor are new. The truck worked some miles with no problem. I already changed the BCM, and I did relearn procedure for the vats (pass lock) etc. And I didn’t have any security light, but I suspect that this is because a similar problem happened to me when changing BCM more I scanned it and there is a non-communication code between BCM and i/p and PCM. But yet I managed to make it run despite this problem last fall so here it is.
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Sunday, January 29th, 2023 AT 8:38 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,574 POSTS
Yep, I have seen this problem before and it was a shorted fuel injector pulling the voltage down from the PCM, I would unplug all injectors to see if the voltage comes back and if so, plug the injectors in one at a time until the voltage drops, this will be the bad injector, or you can just test them, here is a guide to help:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

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Friday, April 5th, 2024 AT 9:15 AM

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