Cannot adjust timing ?

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Feb 18, 2015 | 12:39 AM

hunter1a

Thread Starter

Newbie

Joined: Jan 2015

Posts: 13

Likes: 0

From: Mojave Desert Calif.

Year: 2004

Model: Cherokee

Engine: 4.0

Cannot adjust timing ?

I have a 2004 G.C. that I just rebuilt the motor (4.0) and tranny (auto) on. I wanted to check the timing but ran into problems when I went to use my timing light. There are no spark plug wires for one thing.
I also read online that the timing cannot be adjusted ?
It runs fine but I noticed that once in awhile it "cough's " when I go to start it. Any help ?

Feb 18, 2015 | 05:05 AM

dave1123

Old fart with a wrench

Joined: Nov 2010

Posts: 14,398

Likes: 741

From: Manlius, east of Syracuse, NY

Year: 2000 XJ Sport & WJ Laredo

Model: Grand Cherokee (WJ)

Engine: 4.0L

It seems you got the cam sensor base and pulse ring installed properly and that's all that matters. The PCM takes care of the rest. If it wasn't right, it wouldn't even start.

Feb 18, 2015 | 02:44 PM

Bustedback

CF Veteran

Joined: Feb 2010

Posts: 12,367

Likes: 23

From: Oroville, CA

Year: 1995

Model: Grand Cherokee

Engine: 4.0 with all of the noise and clatter

There is a syncing procedure that requires a scan tool.

Feb 18, 2015 | 04:11 PM

SeriousOffroad

CF Veteran

Joined: Apr 2008

Posts: 13,952

Likes: 17

Model: Cherokee

Timing is not adjustable on any OBD1 or 2 Jeep. It is controlled by the PCM.

The PCM adjusts timing based on sensor input.

If you have a timing problem it's a result of a signal (or lack there of) from 1 or more sensors.

An OBD2 scanner is crucial to diagnosing the problem.