No spark when warm

1999 PONTIAC MONTANA
18,000 MILES • 3.4L • 6 CYL • 2WD • AUTOMATIC
Avatar
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 3:44 PM
Advertisement
Avatar
ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
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 4:18 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.