99 PCM replace/update
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Joined: Nov 2015
Posts: 2,863
Likes: 201
From: syracuse ny
Year: 1997 230,000 miles
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
Verrry EENteresting. I think I would still buy one tho.
CF Veteran


Joined: Jan 2017
Posts: 3,438
Likes: 417
From: Connecticut
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran


Joined: Jan 2017
Posts: 3,438
Likes: 417
From: Connecticut
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
Thread Starter
CF Veteran
Joined: Jun 2016
Posts: 1,011
Likes: 20
From: CO
Year: 99
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran




Joined: Nov 2015
Posts: 2,863
Likes: 201
From: syracuse ny
Year: 1997 230,000 miles
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
Sound like it would work with that?
CF Veteran


Joined: Jan 2017
Posts: 3,438
Likes: 417
From: Connecticut
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0
There have been a few complaints where users could not get it to work on various systems. Whether that was a compatibility issue or they don't know how drivers work, I couldn't say.
CF Veteran




Joined: Nov 2015
Posts: 2,863
Likes: 201
From: syracuse ny
Year: 1997 230,000 miles
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
I think that will work then. With the Windows 7 you of course get updates to 10.
CF Veteran




Joined: Nov 2015
Posts: 2,863
Likes: 201
From: syracuse ny
Year: 1997 230,000 miles
Model: Grand Cherokee (ZJ)
Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims
Well yeah but I think you can check spark by just placing the probe close to the plug / coil wire. Saw a guy do that. I think they call it "loose coupling".
The big starter current probe is pricey but you can watch the cranking current and determine the compression of each cyl. More current, better compression .
The big starter current probe is pricey but you can watch the cranking current and determine the compression of each cyl. More current, better compression .
CF Veteran


Joined: Jan 2017
Posts: 3,438
Likes: 417
From: Connecticut
Year: 2000
Model: Cherokee (XJ)
Engine: 4.0



that's the spirit!