Mechanics

K1500 NO SPARK

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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Darrin A
April 6, 2010.



Test the distributor pick-up coil.

Rasmataz
Apr 6, 2010.
Where is that located and how do you test it. Just so you are aware, I have noone to help today.

Tiny
Darrin A
Apr 6, 2010.
Its inside the distributor

Rasmataz
Apr 6, 2010.
The only thing inside the distributor is the rotor and the ICM, have replaced both of them

Tiny
Darrin A
Apr 6, 2010.
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.

Rasmataz
Apr 6, 2010.
All that seems to be fine

Tiny
Darrin A
Apr 7, 2010.
Where are you checking for spark? Coil or the plugwire end

Rasmataz
Apr 7, 2010.
At the spark plug

Tiny
Darrin A
Apr 7, 2010.
Check it at the coil side

Rasmataz
Apr 8, 2010.