No start, has fuel and spark

Tiny
DUSTIN JORDE
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • V6
  • MANUAL
  • 100,000 MILES
I've checked and replaced, Fuel pump (gets and holds 55lbs) all fuses are good and relays, new cam sensor, crank sensor, engine is timed properly. It gets good spark on all six cylinders and good fuel pressure on the rail, I'm getting 12V on all six pink wires, but also reading volts on the ground side of the injectors.
Tuesday, May 24th, 2022 AT 6:26 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
When you crank the engine you are getting spark? Sounds like yes.

Next are we getting injector pulse when cranking the engine?

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

Basically, each injector should be getting 12 volts like you are seeing and then the PCM grounds the injector in order to open it.

So, we can have power to the injector, but we need to know if the PCM is grounding it to command it on.

You do this by the guide above or use a test light or Noid light on the injector connector and crank the engine. You should have the test light flashing or blinking as you are cranking the engine.

If you do, then we have spark and fuel being delivered to the engine which leaves air and compression as the only other things needed in order to get the engine to start.

I suspect the engine is getting air, so we need to check the compression.

https://www.2carpros.com/articles/how-to-test-engine-compression

If we don't have compression then that is the issue if we do, then we need to pull the plugs and see what they look like. We may have a weak spark that is not allowing the engine to start.

Or we could have too much fuel but let's start with this and go from there

Thanks
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Wednesday, May 25th, 2022 AT 4:46 PM

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