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
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
  • 52,796 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
  • 52,796 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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