Question about 1989 Jeep Cherokee

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1989 Jeep Idle Races at startup

1989 4.0 L Jeep cherokee laredo, at cold startup the engine rpm's race. Have to shut it off 4,5,6 times to get it to idle at normal speed. Is this the idle control sensor or some other idle control part? Thanks

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  • gregglack Nov 01, 2008

    Just Bought a 1989 Jeep Cherokee Pioneer Just started to RACE at start up. The Car was fine and I drove about 300 miles in a day then parked it and went out for a short drive and it felt like the cruise control was stuck on but later when checking it out all cables worked to the intake manifold, I would have to say is it something with VACCUM? Do not know the car starts and races the engine speed.

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  • Master
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Yes its the iac "idle air control" they go bad also loose batt conections cause this problem good luck

Posted on Sep 20, 2008

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Posted on Jan 02, 2017

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I have a 2004 Jeep Grand Cherokee Laredo 4x4 with the 4.0L. It has approximately 150k miles on it. I started the Jeep with 1/4 tank of fuel in it and it started rough and acted like it was going to die....


long post.
ill reduce it for you.
misfires. (is RPM below 700 then misfire can be normal) for idle speed controls dead.
ISC the isc controls speed, of idle,.
mine stuck like zillion times, in 400k miles. endless.sticking
mine was a tiny gutless stepper motor drive ISC valve.
the cone valve is side gets nasty and sticks (
(PCV gases caused as seen on all engines)
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ever get a tuneup this decade or running spark parts 500,0000 miles
for the new world record.?


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clean it. end story.
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