Slayer6667

hello. Im new to this site. Im working on a 2002 grand cherokee 4.0 and its busting my *****. I keep getting p1391 code. Ive changed the cam sensor,crank sensor and the pcm.I tore open the wire harness and cant find any burnt or broken wires. Can somebody PLEASE point me in the right direction.

CompleteCherokee

did you use a good brand crank sensor, or a cheapy?

Fred/N0AZZ

This needs to be moved to the GC forum may get more help.

Xj88

Moved

dave1123

Check the plugs on the PCM. they can rattle loose or get a corroded pin connector.

Slayer6667

Thanks for all the replies. I finally figured out the problem. Apparently when the new cam sensor was installed it was put in 3or4 teeth off. I was told by the owner that a known good mechanic put the sensor in and knew what he was doing. Truck runs great now. They even had it at the dealership,cant believe they couldn't figure it out.....

dave1123

The problem is when they pulled it, they took out the oil pump drive gear as well. That had to be retimed. The sensor comes out easily leaving the gear still in and timed. The "Good mechanic" didn't do it right and the dealership thought he did.

Welcome to CF, BTW!

CompleteCherokee

glad to hear it was an easy fix, although hard to figure out

Fred/N0AZZ

It seems that its the simple ones that cause the most problems at times and the most challenging when its an "Operator or Installer" malfunction's.

Been there done that more times than I care to admit.