Engine not starting, no codes?

1999 GMC SIERRA
164,000 MILES • 6.0L • V8 • 4WD • AUTOMATIC
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CADENRICCI
  • MEMBER
  • 1 POST
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.
Jul 28, 2022 at 4:21 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,244 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
Jul 28, 2022 at 7:04 AM
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