Weird Idling
My 1990 Cherokee will start up just fine; but it will idle at different revs about every 20 seconds it will go up higher, then drop down. This is only in park.
Any idea what it could be?
Any idea what it could be?
Renix Super Guru
Joined: Mar 2008
Posts: 24,653
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From: In yourz postez fissin jurr spelinzs
Year: 1990XJ/1989MJ
Model: Comanche
Engine: 4.0L Renix
This is addressed in your other thread. Read it first and then see if you have an answer.
CF Veteran
Joined: Nov 2008
Posts: 7,874
Likes: 100
From: Northern Ontario, Canada
Year: 1990, 1999, 2000
Model: Cherokee
Engine: 4.0
i didn't see your other thread, but, do you have a/c, and is it on, or at least the defrost setting selected with either cool or heat.
with an a/c equipped jeep, your a/c pump will run whenever you have any a/c modes selected, or your defrost. doesn't matter if it's in cool mode or heat mode.
you will hear the pump kick in and out about every 20 seconds. it will sound like the engine revs up a tiny bit when the pump kicks in. then back to idle when it kicks out.
with an a/c equipped jeep, your a/c pump will run whenever you have any a/c modes selected, or your defrost. doesn't matter if it's in cool mode or heat mode.
you will hear the pump kick in and out about every 20 seconds. it will sound like the engine revs up a tiny bit when the pump kicks in. then back to idle when it kicks out.
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