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1993 GMC C1500 coil pack: no fire

Tiny
WHITEDEMON89
  • MEMBER
  • 1993 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 272,000 MILES
My 1500 shut down while driving and wouldn't start again.
I changed the electronic control module, the coil pack, and the ignition control module. The ignition fuse under the dash is good. I don't know what else to check. I pulled a code and it said ECM fault, but I changed the ECM and its still wont start. There is no fire between the coil pack and the distributer cap. Please help.
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Wednesday, June 4th, 2008 AT 8:44 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Inspect and test the distributor pick-up coil see below


https://www.2carpros.com/forum/automotive_pictures/12900_pick_up_coil_1.jpg

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Thursday, June 5th, 2008 AT 3:34 AM
Tiny
WHITEDEMON89
  • MEMBER
  • 4 POSTS
Am I just looking for continuity?
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Thursday, June 5th, 2008 AT 11:27 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
No.1 should read infinite and No.2 500 to 1500ohms
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Thursday, June 5th, 2008 AT 2:50 PM
Tiny
WHITEDEMON89
  • MEMBER
  • 4 POSTS
No 1 was Open Line (infinite)
No 2 was 862 ohms.
Any other ideas would be great. Thank you.
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Thursday, June 5th, 2008 AT 7:48 PM
Tiny
RASMATAZ
  • MECHANIC
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Check for battery voltage at the pink wire on the coil-No power there and ignition fuse tested good-its coming from the ignition switch.
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Friday, June 6th, 2008 AT 3:02 PM
Tiny
WHITEDEMON89
  • MEMBER
  • 4 POSTS
Pink wire is drawing the same voltage as the battery.
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Friday, June 6th, 2008 AT 3:39 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be a bad ignitiion control module again or the computer is not picking up an ignition reference signal to tell the ICM to fire the coil-

Try this disconnect the coil wire from the distributor and ground it to the engine and crank it over-do you have a snapping blue spark? If so check the rotor and distributor cap-it has to make it out of there to get to the plugs. Still no spark recheck above and test the wiring from the distributor to the computer-
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Friday, June 6th, 2008 AT 4:10 PM

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