No spark when warm

1999 PONTIAC MONTANA
18,000 MILES • 3.4L • 6 CYL • 2WD • AUTOMATIC
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REDOXJOHN
  • MEMBER
  • 2 POSTS
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.
Jul 30, 2018 at 8:44 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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
Jul 30, 2018 at 9:18 AM
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