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Cranks no start

Tiny
77JOHN77
  • MEMBER
  • 2000 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 183,000 MILES
Truck listed above is a 1500 5.3L vortec stalled on me last Saturday. I have replaced the fuel pump, fuel filter, plugs, plug wires, and coils and the truck doesn't want to start. I have fuel at the shrader valve an I have spark so what else could be keeping it from running?
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Monday, March 23rd, 2020 AT 9:27 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

I would start by checking the compression if you have fuel and spark to be sure the timing chain has not slipped.

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

https://www.2carpros.com/articles/car-cranks-but-wont-start

Can you test the actual fuel pressure? You need to be sure the proper pressure is at the fuel rail.

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

Roy
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Monday, March 23rd, 2020 AT 9:32 AM
Tiny
77JOHN77
  • MEMBER
  • 3 POSTS
It has compression and I pushed the shrader valve in with a small screw driver and fuel sprayed out. As far as the radiator but I do not have a tester to test just how much pressure I actually have.
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Monday, March 23rd, 2020 AT 9:51 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You can rent a tester at a part store that will hook to the port and give you the pressure.

What was the compression?

When you crank the engine does the tachometer move up a little?

Is the check engine light on?

Roy
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Monday, March 23rd, 2020 AT 9:56 AM
Tiny
77JOHN77
  • MEMBER
  • 3 POSTS
If I remember correctly it was like 123 to 126 and yes the tachometer moves up a little and the check engine light is on.
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Monday, March 23rd, 2020 AT 10:00 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Compression is low.

https://www.2carpros.com/articles/the-reasons-for-low-compression

The crank sensor is working.

Any idea on the fuel pressure?

Can you give me the code?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If you spray some starter fluid in the air filter, does it start and stall?

Roy
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Monday, March 23rd, 2020 AT 2:23 PM

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