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Crank, no start

Tiny
ADAMP 09
  • MEMBER
  • 1997 GMC SONOMA
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 153,000 MILES
Truck will crank, but won't start. Original problem was no power to fuel pump, but could jump, relay and, pump and truck would run. Replaced oil pressure switch, now the truck has no power to coil ignition control, mod crank, sensor or distributor. All fuses are good and have power when key is on. Also tried hooking up scan tool and could not get it to link.
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Wednesday, March 6th, 2019 AT 3:03 PM

3 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This sounds to me like it could be a wiring problem coming the Powertrain Control Module(PCM) a.K.A. "computer". Having said that, I have included for you, a troubleshooting guide from the vehicle manufacturer for you in the diagrams down below. Please go through it and get back to us with what you find out.

Thanks,
Alex
2CarPros
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Friday, March 8th, 2019 AT 4:26 AM
Tiny
ADAMP 09
  • MEMBER
  • 2 POSTS
Thanks fir the reply. I got the truck running. The wire harness came unplugged right above the brake booster. I couldn't see it because it had a black cover over it.
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Friday, March 8th, 2019 AT 10:54 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
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Monday, March 11th, 2019 AT 11:00 AM

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