High idle issue, cant figure it out.
#1
Seasoned Member
Thread Starter
Join Date: May 2012
Posts: 350
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
High idle issue, cant figure it out.
I'm having an issue with high idle, cleaned the IAC, replaced the TPS, cleaned the throttle body (wasn't all that dirty), replaced the engine air temp sensor, and still idles high. The OX sensor was replaced about two months ago, and the CPS was replaced about two years ago.
The only engine codes I WAS getting, were 12 & 25.
It's fine when I do a cold start, and drives fine.
If I turn it back on after it's warmed up, that's when it starts acting up.
It down shifts hard into 1'st gear, and revs up to 1,200-1,500. I put it in neutral and/or park, and let off the break, it still revs high.
I'm at a loss right now and need some advice.
1995, 4.0, autotrans, all after market exhaust (just two months old).
The only engine codes I WAS getting, were 12 & 25.
It's fine when I do a cold start, and drives fine.
If I turn it back on after it's warmed up, that's when it starts acting up.
It down shifts hard into 1'st gear, and revs up to 1,200-1,500. I put it in neutral and/or park, and let off the break, it still revs high.
I'm at a loss right now and need some advice.
1995, 4.0, autotrans, all after market exhaust (just two months old).
#3
Member
Join Date: Sep 2013
Location: Thurston County WA.
Posts: 104
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1990
Model: Cherokee
Engine: 4.0 HO
replace the IAC.
could be a vacuum leak. normally only the renix models had issues with the intake getting lose, but it is worth a check
could be a vacuum leak. normally only the renix models had issues with the intake getting lose, but it is worth a check
#5
Seasoned Member
Thread Starter
Join Date: May 2012
Posts: 350
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
#6
CF Veteran
You " started messing with the wires" and the idle came down. Define messing.
Sounds like an electrical connection/wiring problem, and messing with it didnt fix it, it likely just temporarily made contact. Chase the cause for a permanent fix because it will be back...
Sounds like an electrical connection/wiring problem, and messing with it didnt fix it, it likely just temporarily made contact. Chase the cause for a permanent fix because it will be back...
#7
Seasoned Member
Thread Starter
Join Date: May 2012
Posts: 350
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Trending Topics
#10
Seasoned Member
Thread Starter
Join Date: May 2012
Posts: 350
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Ok, well I thought I solved the issue. I've re torqued the manifold bolts, cleaned the O2 sensor, even sprayed carb cleaner along the manifold gasket. I'm positive there isn't any air leaks.
I'm still getting codes 24/25 being thrown. I ordered a new TPS and MAT sensor connector to re wire the sensors. Seeing how code 25 says it's a short.
I'm still getting codes 24/25 being thrown. I ordered a new TPS and MAT sensor connector to re wire the sensors. Seeing how code 25 says it's a short.
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
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)