Question about 2004 Jeep Grand Cherokee

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I drove about 2200 miles this weekend in my 2004 Jeep Grand Cherokee and it was from mass to Iowa and back, when I got to Iowa shut off my car and then later on at night I ran to the store my engine light was on. It ran fine. Could it be the o2 sensor?

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  • Jeep Master
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It most likely is,but stop at a auto zone,they will check it for free,make sure that is all that it is.

Posted on Jun 01, 2010

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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)
i clean it.
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ever get a tuneup this decade or running spark parts 500,0000 miles
for the new world record.?


now the tricky part of ISC, , fully explained in the SM serv. man.
the PCM learns its behaviors.
it learns all hot start settings and cold
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if it can move there(sticks) engine car race.
or run too slow,
cold start would be worse, as hot isc is more closed
so if sticks there closed, the next cold start will be horrid
some newer manuals telly you to add 5% throttle if car is hard starting this is so common.

clean it. end story.
ISC

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1 Answer

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1 Answer

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