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
CF Veteran
Join Date: Apr 2011
Location: Indianapolis
Posts: 4,825
Likes: 0
Received 2 Likes
on
2 Posts
Year: '99 and '91
Model: Cherokee
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,971
Received 1,559 Likes
on
1,263 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,971
Received 1,559 Likes
on
1,263 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,971
Received 1,559 Likes
on
1,263 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Join Date: Nov 2013
Location: Wetumpka, AL
Posts: 1,347
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1987
Model: Cherokee
Engine: 4.0
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,971
Received 1,559 Likes
on
1,263 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Senior Member
Join Date: Feb 2014
Location: Minnesota
Posts: 854
Likes: 0
Received 1 Like
on
1 Post
Year: 1996
Model: Cherokee
Engine: 4.0
That's what i was thinking!
I will check tomorrow after work, it's cold outside and i already downed a couple beers lol
I will check tomorrow after work, it's cold outside and i already downed a couple beers lol
::CF Moderator::
Join Date: Aug 2011
Location: Prescott, Az
Posts: 43,971
Received 1,559 Likes
on
1,263 Posts
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Member
Join Date: May 2012
Location: Gilbert, Arizona
Posts: 203
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Need some help with my nieces XJ. It is a 1999 Sport, 4.0, automatic. Unfortunately I can only relate what she is telling me, but I have run out of ideas and have no way to go check it out myself. She says it rev's up on its own (not sure how high it revs) when sitting at a stop light and will overheat (just found out it only heated up twice, not sure how hot tho).
After doing some reading here I suggested:
1) clean IAC
2) Clean throttle body and valve
3) test TPS
4) check for vacuum leaks around intake
and this is the response I got from her boyfriend:
Replaced tps sensor, ignition coil, spark plugs, wires, cap, rotor, fuel filter and pump, ecm, cleaned out throttle body and checked all fuel injectors. Checked for evap leaks around intake, no leaks. It has a surging issue with the coil and injectors. It's an inline 6, 4.0, 2wd with 118,000 on it. Started following wiring going from ignition coil to harness found two broken wires shorting to ground, repaired wiring, problem still persists. The engine will go up in rpms at idle and while running. Very random and not a constant pattern. After flashing the new ecm and installing it, the problem was fixed for a day and a half and then came back. I did some research on it and found out the '97-'01 4.0L Cherokees had a lot of problems with the harness going to the ecm in the engine compartment. I believe it's the harness, from the electrical tests I did and all of the parts we changed out. I also traced all visable wiring to search for anymore broken wiring or any metal to metal contact and nothing else was found. Any advice would be great at this point, the only open recalls I found from the dealer was the air bag light coming on and gauges all dropping (clock spring) nothing regarding any wiring.
Sorry about all of the second hand info, but it is all I have. If there is anything at all you can think of please let me know and I will pass it along. If not, no worries, figured it was worth a shot asking.
Have a good one and as always Thanks!
Dro
After doing some reading here I suggested:
1) clean IAC
2) Clean throttle body and valve
3) test TPS
4) check for vacuum leaks around intake
and this is the response I got from her boyfriend:
Replaced tps sensor, ignition coil, spark plugs, wires, cap, rotor, fuel filter and pump, ecm, cleaned out throttle body and checked all fuel injectors. Checked for evap leaks around intake, no leaks. It has a surging issue with the coil and injectors. It's an inline 6, 4.0, 2wd with 118,000 on it. Started following wiring going from ignition coil to harness found two broken wires shorting to ground, repaired wiring, problem still persists. The engine will go up in rpms at idle and while running. Very random and not a constant pattern. After flashing the new ecm and installing it, the problem was fixed for a day and a half and then came back. I did some research on it and found out the '97-'01 4.0L Cherokees had a lot of problems with the harness going to the ecm in the engine compartment. I believe it's the harness, from the electrical tests I did and all of the parts we changed out. I also traced all visable wiring to search for anymore broken wiring or any metal to metal contact and nothing else was found. Any advice would be great at this point, the only open recalls I found from the dealer was the air bag light coming on and gauges all dropping (clock spring) nothing regarding any wiring.
Sorry about all of the second hand info, but it is all I have. If there is anything at all you can think of please let me know and I will pass it along. If not, no worries, figured it was worth a shot asking.
Have a good one and as always Thanks!
Dro
CF Veteran
Join Date: Nov 2013
Location: Wetumpka, AL
Posts: 1,347
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1987
Model: Cherokee
Engine: 4.0
Definitely not needed. I had poor heat in mine. Found I had a bad heater core(checked temp across hoses, then a week later my core exploded) when I bypassed the core I removed the valve. Now that my new core is in and hooked up its a fire breathing monster in there
Senior Member
Join Date: Feb 2014
Location: Minnesota
Posts: 854
Likes: 0
Received 1 Like
on
1 Post
Year: 1996
Model: Cherokee
Engine: 4.0