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1989 GMC Truck 1989 GMC K1500 no spark

Tiny
DARRIN A
  • MEMBER
  • 1989 GMC TRUCK
Electrical problem
1989 GMC Truck V8 Four Wheel Drive Manual

While driving, my truck just shut down. I have no spark. I replaced the plugs, wires, Dist. Cap, rotor, ICM and coil. I have 12v at the coil and still no spark. Could it be the PCM or the ECM?
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Tuesday, April 6th, 2010 AT 11:25 AM

9 Replies

Tiny
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Test the distributor pick-up coil.
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Tuesday, April 6th, 2010 AT 11:31 AM
Tiny
DARRIN A
  • MEMBER
  • 5 POSTS
Where is that located and how do you test it. Just so you are aware, I have noone to help today.
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Tuesday, April 6th, 2010 AT 11:35 AM
Tiny
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Its inside the distributor
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Tuesday, April 6th, 2010 AT 1:00 PM
Tiny
DARRIN A
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The only thing inside the distributor is the rotor and the ICM, have replaced both of them
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Tuesday, April 6th, 2010 AT 1:08 PM
Tiny
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Disconnect the 2 wire connector that connects to the ignition module and using an OHM meter probe the disconnected 2 wire electrical connector that goes to the PICKUP COIL and you should have an OHM reading of 500 to 1500 ohms.

Also check each lead of the pickup coil to be sure that neither wire is shorted to ground.
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Tuesday, April 6th, 2010 AT 1:16 PM
Tiny
DARRIN A
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All that seems to be fine
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Wednesday, April 7th, 2010 AT 2:15 PM
Tiny
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Where are you checking for spark? Coil or the plugwire end
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Wednesday, April 7th, 2010 AT 3:48 PM
Tiny
DARRIN A
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At the spark plug
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Wednesday, April 7th, 2010 AT 11:44 PM
Tiny
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Check it at the coil side
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Thursday, April 8th, 2010 AT 12:08 AM

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