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Will not start

Tiny
KLEGGSKAA1
  • MEMBER
  • 1993 GMC SIERRA
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
It wont start or fire. We changed the computer. Pick up coil. Fuel pump relay. Ignition coil and still wont start or fire.
Friday, February 8th, 2019 AT 11:52 AM

2 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This sounds like it could be a problem with your Crankshaft Position Sensor(CKP). Here are are a few links explaining what a CKP sensor is, symptoms of when it goes bad, and how to replace it:

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Also, I have included a factory Inspection flow chart for you in the diagrams down below. Check it out and let us know what you find out.

Thanks,
Alex
2CarPros
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Friday, February 8th, 2019 AT 7:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,527 POSTS
If I can jump I here. Will it run on starting fluid? Next if you turn the key on while cranking the engine can your hear the fuel pump run for five seconds?

This guide can help as well:

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

Alex is one of our newest experts and by the looks of it going to be one of our best. Please run down these guides and report back.

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Monday, February 11th, 2019 AT 3:07 PM

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