PavementPrincess
NAXJA Forum User
- Location
- Oregon
I’ve got a 2001 cherokee 4.0 I’m having idle issues. I have searched and searched but haven’t found anything specific enough to help. Motor has 115k miles auto trans. Has new head and head gasket. Only problem is a miss at idle only. Starts fine hot or cold. No check engine light or codes stored. Get consistent 17.5 mpg however I drive it. Doesn’t run hot, right at 210 regardless of temp. Idle doesn’t change based on temp either. Idles the same when it’s cold or hot. Plugs done less than 1k miles ago. Was gonna pull em and read em. Like I said it’s fine all the time only at idle. I’ve got a scanner I can read live data but to be honest I don’t know how to interpret all of the readings from the 02 sensors. Where would you guys start if this was your rig? I’m gonna test each emission sensor according to online procedures and hope I get lucky. I’ve read about fuel pressure issues but I can’t figure out why it would only have issues at idle. I’ll test the pressure and report back. If I do a live data reading on my scanner and post it maybe I can get some feedback. Another thing when u do a live reading do you want a cold reading and operating temp? I feel lost trouble shooting when I have no codes or obvious failures.
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