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1992 GMC C1500 1992 GMC WILL NOT START, NO SPARK

Tiny
VETTE68
  • MEMBER
  • 1992 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
I was driving along then motor quit, NO SPARK, all ignition components check out fine, power at all the right places, I pulled the ECM connector off the ignition module and jumped terminal A to C and got healthy spark but no gas spray from the injectors, pored some gas down the throttle body and she runs for a few seconds, got late so I put every thing back the way it should be and turned the key one last time and she fired up as normal, went for a run, every thing seemed fine, next morning NO SPARK again, could it be the ECM or the ESC/EST?
Please Help.
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Tuesday, December 1st, 2009 AT 10:17 AM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, my info showed est. During cranking, the ignition module controls the spark, uses signal from pick-up coil. Check primary circuits at coil when problem occurs. Pink wire is voltage. Should be a pulse on the white wire, engine cranking. Any trouble codes?
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Tuesday, December 1st, 2009 AT 10:46 AM
Tiny
VETTE68
  • MEMBER
  • 2 POSTS
Engine service light NOT on, NO service codes, just the code 12 diagnostic code.
So if I put a test light on the white wire it should flicker during cranking?
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Tuesday, December 1st, 2009 AT 1:09 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Yes, it should. If the lite is on and doesn't pulse, I'd check the pickup coil and ignition module.
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Tuesday, December 1st, 2009 AT 2:45 PM

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