FIRE TO SPARK PLUGS

  • Tiny
  • ByronChevyman
  • 1990 Chevrolet Caprice
  • V8
  • automatic

My 1990 caprice will start but 4 of my spark plugs are not gettting fire, whats wrong?

Saturday, February 5th, 2011 AT 2:08 AM

3 Answers

  • Tiny
  • JDL
  • Expert
  • 16,236 posts

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

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Saturday, February 5th, 2011 AT 4:28 PM
  • Tiny
  • ByronChevyman
  • Member

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

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Monday, February 7th, 2011 AT 8:47 PM
  • Tiny
  • JDL
  • Expert
  • 16,236 posts

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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Monday, February 7th, 2011 AT 9:15 PM

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