Last edit by: IB Advertising
See related guides and technical advice from our community experts:
Browse all: General Overview
- Jeep Grand Cherokee WJ 1999 to 2004 Crash Test and Safety Ratings
Important Information to help you understand your Jeep Grand Cherokee.
Browse all: General Overview
XJ Ask the Question Thread
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
NP249 in ZJs is like that. XJs, being a real Jeep, are just gears (planetary differential).
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Definition of snake oil.
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
They claim it's the perfect additive for every type of engine, as well as power steering, transmissions, and more. It increases horsepower and fuel economy. It bonds to metal and changes its surface after adding it to oil, but it doesn't affect any of the oil's properties. And I don't know about ZDDP, but it doesn't contain molybdenum.
Definition of snake oil.
Definition of snake oil.
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Cruise control has been finicky lately. Just installed a new-to-me clock spring and a JY engine servo.
- Most times when I turn the cruise control on the servo will not kick in to hold the speed
- Sometimes the cruise control light will not come on at all
- Horn still works and there is no airbag light, even when the cruise control light will not come on at all
- Sometimes after failing to engage the servo, the cruise control light will turn off and will not come back on after pressing the on button
Any ideas?
Thanks in advance
- Most times when I turn the cruise control on the servo will not kick in to hold the speed
- Sometimes the cruise control light will not come on at all
- Horn still works and there is no airbag light, even when the cruise control light will not come on at all
- Sometimes after failing to engage the servo, the cruise control light will turn off and will not come back on after pressing the on button
Any ideas?
Thanks in advance
Moderator of Jeeps
Joined: Jul 2011
Posts: 21,029
Likes: 3
From: Frederick, MD from Cleveland, OH
Year: 1993 YJ Wrangler
Engine: 4.0 I6
Cruise control has been finicky lately. Just installed a new-to-me clock spring and a JY engine servo.
- Most times when I turn the cruise control on the servo will not kick in to hold the speed
- Sometimes the cruise control light will not come on at all
- Horn still works and there is no airbag light, even when the cruise control light will not come on at all
- Sometimes after failing to engage the servo, the cruise control light will turn off and will not come back on after pressing the on button
Any ideas?
Thanks in advance
- Most times when I turn the cruise control on the servo will not kick in to hold the speed
- Sometimes the cruise control light will not come on at all
- Horn still works and there is no airbag light, even when the cruise control light will not come on at all
- Sometimes after failing to engage the servo, the cruise control light will turn off and will not come back on after pressing the on button
Any ideas?
Thanks in advance
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 102
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Cruise control has been finicky lately. Just installed a new-to-me clock spring and a JY engine servo.
- Most times when I turn the cruise control on the servo will not kick in to hold the speed
- Sometimes the cruise control light will not come on at all
- Horn still works and there is no airbag light, even when the cruise control light will not come on at all
- Sometimes after failing to engage the servo, the cruise control light will turn off and will not come back on after pressing the on button
Any ideas?
Thanks in advance
- Most times when I turn the cruise control on the servo will not kick in to hold the speed
- Sometimes the cruise control light will not come on at all
- Horn still works and there is no airbag light, even when the cruise control light will not come on at all
- Sometimes after failing to engage the servo, the cruise control light will turn off and will not come back on after pressing the on button
Any ideas?
Thanks in advance
Defective switch(es) on the steering wheel.





seriously though, I wonder when/where I was under impression there was a viscous coupler..

