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Fire to spark plugs

Tiny
BYRONCHEVYMAN
  • MEMBER
  • 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 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 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
  • 2 POSTS
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
  • MECHANIC
  • 16,098 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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