SPONSORED LINKS

Engine shuts off after 25 minutes?

Tiny
QFONG
  • MEMBER
  • 1995 MERCURY MYSTIQUE
  • 2.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 131,000 MILES
After the engine idles for about 25 minutes, it shuts off and will not restart. The PCM/ECM is very hot to the touch. I can smell unburned gas when I try to restart.
Monday, April 3rd, 2023 AT 11:58 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
The PCM should not be hot, it sounds like you have a shorts injector, ignition coil or a bad ground to the PCM, can you see if the coil is hot as well, if so, I would replace it with a new one. Check out the images (below). Please let us know what happens.
Images (Click to make bigger)
Thumb
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Monday, April 3rd, 2023 AT 3:41 PM
Tiny
QFONG
  • MEMBER
  • 92 POSTS
The PCM should be grounded from terminals 20 and 60, is that correct? The coil pack is new. It was warm but it sits right over the bank 1 exhaust manifold. I will investigate tomorrow.
Was this
answer
helpful?
Yes
No
Monday, April 3rd, 2023 AT 5:36 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Here are the PCM wiring diagrams so you can see which wires are power and which are grounds.

This guide can help you check:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the images (below). Please let us know what happens.

Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Thumb
Was this
answer
helpful?
Yes
No
+1
Tuesday, April 4th, 2023 AT 10:06 AM

Please login or register to post a reply.

Related Engine Stall While Driving Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
Engine Stalls While Driving
GUIDE
Engine Stalls While Driving
An engine that stalls while driving and then starts back up again, either immediately or after a short time is different from an engine that just wont start or if the...
VIEW MORE

Sponsored links