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Not getting a consistent spark out of the coil?

Tiny
HARRY CLARK
  • MEMBER
  • 1975 FORD F-350
  • 7.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I'm not getting consistent spark out of my coil when I first turn the key on it sparks and when I turn the key off it sparks but no spark when revving. Sometimes the engine will fire right off no problem be running fine then all of a sudden quit running. I've replaced all switches and coil electron control box, no go.
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Tuesday, March 21st, 2023 AT 11:14 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
It is common for the ignition module and ignition coil to go out on these trucks. I would replace them both to fix the problem.
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Tuesday, March 21st, 2023 AT 1:03 PM

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