Weird weird weird idle!!!!!!
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Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Wheel, break, fix, repeat
Joined: Dec 2011
Posts: 205
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From: Chesapeake, VA
Year: 1987
Model: Cherokee
Engine: AMC I6 4.0
Food for thought. I have an 87. It had the same idle issues when I first got it. I did the same ground cleaning and vacuum checks listed here but nothing worked. I started poking around the fuel rail and I pulled back the heat covers on my injectors. I found that TWO of the injectors each had a broken wire. I was running a 4 cylinder. I'm actually impressed at how "well" this engine runs on 4 cylinders. It's not smooth, but it still runs. When it get up to temp it actually keeps itself breathing, mostly...
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Joined: May 2012
Posts: 21
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From: Clackamas, OR
Year: 1988
Model: Cherokee
Engine: 4.0
O2 sensor is done and it is running alot better. The idle issue is still there. Started it this morning and the idle was at 700, then started it when I was leaving the store and it idled up at 2000. I canceled the CPS order from Crown and went to Jeep and ordered the actual Mopar one today. The injectors were all good so I will let you guys know what happens when I replace the CPS tomorrow.
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