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Crank no start

Tiny
BRANDONELI
  • MEMBER
  • 1998 GMC SIERRA
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 345,000 MILES
Okay, I plugged a computer to the truck and it tells me the crank sensor. So I buy a new one. Put it on an I be darn, same thing. What else do I need to do? Change the camshaft sensor too? Someone help me out. This just happen out the blue nothing else is wrong with the truck. Help
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Wednesday, November 11th, 2020 AT 10:49 AM

4 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Let's start with what the actual code is that you are getting. Unfortunately there is normally a few things that can cause these types of codes so let us know what the actual code is and we can figure out next steps.

Thanks

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

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor
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Wednesday, November 11th, 2020 AT 11:23 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

What is the code number that was sent? Codes rarely identify bad parts just failed systems.

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

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

When you crank the truck, does the tachometer move up a little showing RPM? That will tell me if the crank sensor is sending a signal to the ECM.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

Can you hear the fuel pump run?

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

I attached the wiring diagram of the system for you.

https://www.2carpros.com/articles/how-to-check-wiring

Roy
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Wednesday, November 11th, 2020 AT 11:30 AM
Tiny
BRANDONELI
  • MEMBER
  • 3 POSTS
No RPM movement. The scanner has a screen. So it said crank sensor. Fuel pump comes on. But no start. Should I replace both cam sensor and crank sensor?
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Wednesday, November 11th, 2020 AT 11:38 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Again, what is the code?

Can you check for voltage to the crank sensor?

Roy
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Wednesday, November 11th, 2020 AT 11:45 AM

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