No spark when warm

Tiny
REDOXJOHN
  • MEMBER
  • 1999 PONTIAC MONTANA
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 18,000 MILES
When warm there is no signal at ignition control
at the ICM. ICM is new.
Signal is there when engine is cold and it does starts.
Monday, July 30th, 2018 AT 3:44 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The signal comes from the crank sensor.

When it does not start, does the tachometer move up while cranking?

Check the harness at the crank sensor.

Roy
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Monday, July 30th, 2018 AT 4:18 PM

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