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Crank sensor

Tiny
TUCKER ONE
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • 7.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Was starting hard, found the crank sensor was loose. Tightened and ran good until hot. Misfires and runs terrible, will not even make a hill. The more gas you give the worse it runs. Sometimes if you let up a little bit it will smooth out and pick up speed until you move the gas pedal then it falls on its face. Like it is running on four cylinders.
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Monday, January 23rd, 2017 AT 1:32 PM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Change out the crank sensor. It may have been damaged while loose. Check the wiring as well. The symptoms you give sound timing related.
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Monday, January 23rd, 2017 AT 1:57 PM
Tiny
TUCKER ONE
  • MEMBER
  • 1 POST
I think that you are right about it being timing related. I just do not know why it will come out of it at certain speeds and run really good when engine is cold. Any ideas on that?
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Monday, January 23rd, 2017 AT 2:15 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Typical crank sensor issue is being temperature sensitive. If you have access to a scan tool you can actually look at the signal and see what it is telling the ECM to do with regard to timing and injector pulse.
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Monday, January 23rd, 2017 AT 5:31 PM

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