- Joined
- Dec 16, 2025
- Messages
- 1
- Points
- 1
- City
- Mankato
- State - Country
- MN - USA
- Vehicle Year
- 2000
- Vehicle
- Ford Ranger
- Drive
- 4WD
- Engine
- 4.0 V6
- Transmission
- Automatic
- Total Lift
- Leveling kit
- Tire Size
- 31 10.5 R15
I bought a 91 ranger with a 2.3/manual from a buddy in a crank/no start condition. After looking it over, I had an intermittent spark condition, it would occasionally get spark once the first time i would crank it over, then be dead. But now it consistantly has no spark. I had taken the icm to the parts store to get bench tested, and it passed. Using a test light, the coils are getting power, but the connector on the bottom of the dis module has a weak ground with key off, and no ground with key in the run position. If i go back and probe pin 16 on the pcm, which is ignition ground, with the bottom connector of the icm unplugged, it has the same symptoms. But if I plug in the connector for the icm, it has a strong ground at the pcm. If im reading the wiring diagram correct, it also ties into the crank position sensor. By plugging the connector into the bottom of the icm, am I pulling the ground off the crank sensor, and thats why my ground improves off the pcm? Im assuming i need a new pcm, because pin 16 looses ground with the key on when unplugged from tge dis module, and the other three main grounds are fine on the pcm.
