90 Renix bad idling issues
#1
CF Veteran
Thread Starter
Join Date: Nov 2009
Location: Conroe, Texas
Posts: 1,262
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Cherokee
Engine: I6
90 Renix bad idling issues
I recently bought a 90 model cherokee renix laredo with 150k miles. everything is fine except for the idle. when it first starts it runs fine at around 7-800 rpms then after about 3 minutes of warming up it goes up from there, it'll jump to 1000 then all the way to 1800 then back to 1500 fluctuating, then after it reaches operating temp it wont leave about 1700 rpms, it sucks driving down the road trying to stop the thing. i've replaced the tps and the IAC. The Tps cured my shifting problem, wouldn't shift out of first gear unless i took the fuse out and shifted manually. What else should i be looking at?
#3
CF Veteran
Thread Starter
Join Date: Nov 2009
Location: Conroe, Texas
Posts: 1,262
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Cherokee
Engine: I6
#4
Junior Member
Join Date: Apr 2010
Location: Blanding, UT
Posts: 93
Likes: 0
Received 0 Likes
on
0 Posts
Year: 88
Model: Cherokee
Engine: 4.0 renix
check you 02 sensor, i was having issues like yours and i chased the prob around for half a year. i bought the sensor about 7 months ago , just never put it in cause i was told it wasn't the prob. finally changed it anyway and what a diff. way more power and nice smooth idle. the sensor was toasted(sounded like a worn out baby rattle when i shook it) my 88 has 162 k miles on it and had the original o2 sensor.
#6
Seasoned Member
Join Date: Sep 2010
Location: Chattanooga
Posts: 306
Likes: 0
Received 1 Like
on
1 Post
Year: 1989
Model: Cherokee
Engine: 4.0L I6
Clogged EGR valve could be another potential problem as well. EGRs are a bad issue in the RENIX system. Even the Haynes manual mentions that the EGR sucks.
Have you tried running seafoam through the system? It may not cure your problem but might make it better. I had a small revving when cold issue, it would just stall out. Ran seafoam through the system and it completely fixed it.
I used to have a high idle, near or at 1500rpm, and replacing the EGR fixed it for the most part at least. Cold idles at 700rpm, but slowly creeps up to 1000rpm.
Have you tried running seafoam through the system? It may not cure your problem but might make it better. I had a small revving when cold issue, it would just stall out. Ran seafoam through the system and it completely fixed it.
I used to have a high idle, near or at 1500rpm, and replacing the EGR fixed it for the most part at least. Cold idles at 700rpm, but slowly creeps up to 1000rpm.
Thread
Thread Starter
Forum
Replies
Last Post
Blackcherokee290
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
27
07-26-2022 07:52 PM
frantic29
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
16
09-26-2015 04:30 PM
Ye Ol' Cherokee
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
15
09-05-2015 04:36 PM
David Chauncey Clothier
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
08-29-2015 09:31 PM
bornofscreams
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
2
08-24-2015 02:09 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)