1994 GMC Sierra control module in distributor

Tiny
JAMESG1551
  • MEMBER
  • 1994 GMC SIERRA
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 92,000 MILES
Truck would not run. Ase mech. Put new distributor module in, ran for 4 miles and quit again. He gave up. I replaced distributor control module useing gm part useing vin.#. Also replaced wire harness from distributor to coil and pin plug going to engine control module. Same thing again. Smell something burning then quits. Have traced all wiring. Timing was reset after replaced. Don't know what to do next. Could 2 gm modules be defective? Please help. I am lost. This is getting expensive. Thanks james
Tuesday, December 15th, 2015 AT 2:06 PM

5 Replies

Tiny
JAMESG1551
  • MEMBER
  • 4 POSTS
Ase mech. Also put a engine control module in truck. Dont know if he had a good dist. Module in when he did that or not. Sent it back they tested it it was a good unit. James
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Tuesday, December 15th, 2015 AT 3:12 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check to see if two wires leading to module from pick up coil are touching plate and have worn through then check wires leading to distributor. Scan for codes by crossing A & Bat aldl see if you have any codes. Check crank sensor in timing cover clean all sludge and debris off of it. Check vacuum lines for soft like going to map sensor especially. Finally check for a broken gasket at base of tbi unit they break and cause stalling high idle etc. Also check fuel pressure with a gauge should be 9-11 psi you will need an adapter for that. Has fuel filter ever been replaced? Then check fusible links by starter one may be partially burnt causing problem.
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Tuesday, December 15th, 2015 AT 3:12 PM
Tiny
JAMESG1551
  • MEMBER
  • 4 POSTS
Have checked all. No crank sensor on this that I know of. Starting to think miss match between after market distributor and new distributor control module. Burns out module within 4 miles, leaving no ignition.
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Tuesday, December 15th, 2015 AT 6:05 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Do this test and screws are tight also check ground from battery to engine as well as ground wire from rear of cylinder head to body and battery to body ground. Do these tests that i'm sending. If it's a short in tach or tach wire it may do what you are experiencing. Otherwise I have no further suggestions.
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Wednesday, December 16th, 2015 AT 6:54 AM
Tiny
JAMESG1551
  • MEMBER
  • 4 POSTS
Problem solved. Found bad pin plug on wire harness from dist. To coil. I can only guess after years of vibration feamale pin in plug just bigger and was no longer making contact with male plug. Thanks for the help. James
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Thursday, December 17th, 2015 AT 4:49 AM

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