Hello, I’m new to the forum! Let me start by saying that I recently purchased a Jeep.
It has 213,000 miles on the body, but the 4.7 engine has been rebuilt and only has 63,000 miles on it.
The previous owner mentioned that four different mechanics diagnosed the issue as the PCM (Powertrain Control Module).
However, I’m experiencing problems while driving: the Jeep stutters, stalls completely at red lights and stop signs, and sometimes shuts off with a surge-like motion when I try to stop.
Strangely, it always starts right back up without hesitation.
My OBD2 scanner consistently shows code P1391.
Despite researching horror stories related to this issue, none of the electronics in the cab seem to be malfunctioning.
I’ve removed the PCM from the Jeep, and it’s heavily corroded on the back side.
The connectors appear secure, and wiggling them doesn’t affect the idle.
Additionally, I found some wires with scraped or burnt insulation on the left side of the engine block near the starter.
These wires are black and orange, possibly related to the dimmer light.
The scanner also indicates erratic ignition advance behavior, dropping just before the Jeep is about to stall and then recovering.
Overall, the Jeep runs well except for this occasional hesitation.
Tomorrow, I plan to replace the Camshaft position sensor.
Does anyone have insights into what might be causing these issues? Thanks! 