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Engine not starting, no codes?

Tiny
CADENRICCI
  • MEMBER
  • 1999 GMC SIERRA
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 164,000 MILES
My truck won’t start. I checked to see if it had spark, it did. I replaced my fuel pump, filter, fuse, and relay. I replaced the cam shaft and crank shaft sensors. Still have an engine that won’t start. There are no codes to go off of.
Thursday, July 28th, 2022 AT 11:21 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

The first thought was no spark. The coils on these trucks have a common ground on the left front of the engine that is known to fail. I would still recommend checking it.

Now, you replaced the fuel pump. Do you have fuel pressure at the fuel rail? I need to know that first. If you haven't already checked, here is a link that explains how to test fuel pressure:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Let me know what you find. If you have already done this, check the ground I mentioned. It may work one time and not the next.

I will watch for your reply.

Take care,

Joe
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Thursday, July 28th, 2022 AT 2:04 PM

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