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Engine shut off while driving

Tiny
GEERTZE
  • MEMBER
  • 1997 GMC C3500
  • 7.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 176,000 MILES
While driving truck shut off. Cranks but does not start. It has 65 lbs fuel pressure and spark, no codes. Would a crank or cam sensor cause this? I did try a different ECM and checked all the fuses.
Friday, January 26th, 2018 AT 12:59 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

Did you put the original PCM back into the truck? Does the check engine light still work with the key on?

When you crank the engine does the tachometer move up a little showing rpm reading?

Also, remove one plug and check the compression. Lets make sure the timing chain is in time.

Roy
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Saturday, January 27th, 2018 AT 4:31 AM
Tiny
GEERTZE
  • MEMBER
  • 2 POSTS
Not the original PCM and yes the tachometer does move a little. I will check the timing.
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Saturday, January 27th, 2018 AT 7:18 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
If the tachometer moves while cranking, the crank sensor is working.

The swap on the PCM, did you have it flashed to your truck? It needs to see the VIN from your truck to properly work.

Roy
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Saturday, January 27th, 2018 AT 7:41 AM

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