Mechanics

FIRE TO SPARK PLUGS

1990 Chevrolet Caprice • V8 Automatic •

My 1990 caprice will start but 4 of my spark plugs are not gettting fire, whats wrong?
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ByronChevyman
February 5, 2011.



How long since tune-up. Plugs--plug wires--cap and rotor. Any applicable mil codes? Did you visually check for spark at the plugs?

JDL
Feb 5, 2011.
I just gave it a tune up a few days ago. And yes I visually checked by pulling them out 1 by 1 and 4 of them didnt change the motor and wasn't gettin a spark

Tiny
ByronChevyman
Feb 7, 2011.
Use a test lite on negative side of coil, engine cranking, there should be a pulse? If no pulse, suspect the ignition module or pick-up coil. There should be primary voltage at the coil with key on.
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JDL
Feb 7, 2011.

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