Cranks no start

183,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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77JOHN77
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  • 3 POSTS
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?
Mar 23, 2020 at 2:27 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
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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
Mar 23, 2020 at 2:32 AM
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77JOHN77
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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.
Mar 23, 2020 at 2:51 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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
Mar 23, 2020 at 2:56 AM
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77JOHN77
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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.
Mar 23, 2020 at 3:00 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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
Mar 23, 2020 at 7:23 AM
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