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Old March 12th, 2010, 12:03 PM   #1
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Default freeway driving issue

i got a problem with my 01 cherokee that i cant seem to figure out. i thought maybe i could get some more input on it.

driving around town is good but when i am at freeway speeds specifically between 70 and 80 mph my RPM's jump and the vehicle kind of kicks forward and bucks. when it does this the check engine light comes on but then goes off after sitting for awhile. i was wondering if anyone has ever had this same problem and how to fix it. thanks.
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Old March 12th, 2010, 12:18 PM   #2
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I worked at clio chrysler and we had a few that came in doing that. We just changed the iac sensor.
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Old March 12th, 2010, 07:02 PM   #3
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I worked at clio chrysler and we had a few that came in doing that. We just changed the iac sensor.
not that I'm arguing with you, since I dont work on anything Chrysler or related, but what does the Idle Air Control have to do with anything above idle? Or does IAC mean something else to Chrysler/Jeep?
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Old March 13th, 2010, 02:16 AM   #4
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Are you sure its not the trans going and only does it when the overdrive is shifting down and back up ?
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Old March 13th, 2010, 09:23 AM   #5
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torque convertor lockup
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Old March 13th, 2010, 09:41 AM   #6
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Sounds like TC lockup. When the RPMs jump is it about 2-500rpm?
Take it in to autozone or something and see if you can get a code.
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Old March 17th, 2010, 07:26 PM   #7
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thank you all for the advice.
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Old March 17th, 2010, 07:28 PM   #8
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Well, I'm not quite sure how this is a problem, as the maximum speed limit on any Michigan freeway is 70mph. Maybe the jeep is telling you to stop speeding
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