Idle problems
06-03-2018, 09:36 AM
#1
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Model: Cherokee (XJ)
Idle problems
1998 Cherokee 4.0l runs fine then about a minute idles rough, and when you floor it, it clears up. What would cause this issue?
Last edited by Stupid4XJ; 06-03-2018 at 09:39 AM.
06-03-2018, 03:21 PM
#2
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Year: 1999
Model: Cherokee
Engine: 4.0
06-03-2018, 08:09 PM
#3
I have had two causes for a rough warm idle.
1. Used autolite plugs one time. Chased a warm rough idle for a few weeks until I went back to champion coppers. Problem went away.
2. A couple years later, it was back. I had replaced the coil awhile back with an echlin form NAPA (was chasing a different problem). Went back to a MOPAR cold and warm idle problem went away.
In both cases, it seemed to run fine, except at warm idle.
Definitely worth checking/cleaning the IAC too. those cna get pretty nasty. It can be difficult to get a socket in there. When I do anything on the throttle body now, I just take the whole throttle body off. Take the air intake tube off (flat blade screwdriver). 4 bolts holding it in, couple fo electric connectors and done. then you can clean the whole throttle body too. If it's never been done, it can use it.
1. Used autolite plugs one time. Chased a warm rough idle for a few weeks until I went back to champion coppers. Problem went away.
2. A couple years later, it was back. I had replaced the coil awhile back with an echlin form NAPA (was chasing a different problem). Went back to a MOPAR cold and warm idle problem went away.
In both cases, it seemed to run fine, except at warm idle.
Definitely worth checking/cleaning the IAC too. those cna get pretty nasty. It can be difficult to get a socket in there. When I do anything on the throttle body now, I just take the whole throttle body off. Take the air intake tube off (flat blade screwdriver). 4 bolts holding it in, couple fo electric connectors and done. then you can clean the whole throttle body too. If it's never been done, it can use it.
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