1989 4.0 idle too high
Senior Member
Joined: Aug 2010
Posts: 692
Likes: 1
From: Tempe, AZ
Year: 1990
Model: Cherokee
Engine: l6 242
Ive had this problem, everyone is gonna say that you need to check your sensors.
i would start by cleaning out the throttle positioning sensor and the crankcase positioning sensor. maybe even clean out your intake hose and Tb itself. and go from there?
i would start by cleaning out the throttle positioning sensor and the crankcase positioning sensor. maybe even clean out your intake hose and Tb itself. and go from there?
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