Question about 1993 Jeep Grand Cherokee

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Jeep cherokee idling issues

While in park the rpm jumped from 1000 down to around 700 and back up to 1000 what is the issue?
Comments:
- this issue is also when driving say you are on the road at 40 mph ..your rpms are at say 2000 while driving it will slightly jump from say 2000 rpms to 2200 rpms and back and forth..

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  • captncavmn Feb 06, 2010

    wondering if there were other causes

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Have you pulled any trouble codes from this vehicle? How many miles are on the vehicle and was there any work performed before this driveability problem? I'll try to help.Thanks.

Posted on Feb 06, 2010

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The map sensor is the most common cause for this. also idle air control valve could need to be cleaned.

Posted on Feb 04, 2010

  • michael schultz
    michael schultz Feb 06, 2010

    there could be but unlikely. have you had the computer scanned yet? this is the best place to start and have it scanned by a qualified tech.

  • michael schultz
    michael schultz Feb 11, 2010

    vacuum leak would be the other cause. i also see you left two thumbs up and that herts my rating i was just wondering why? i left you a good honest answer. maybe you could reconsider it? thank you for using fixya.com

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1 Answer

1995 jeep gr cherokee laredo jumps when first star in morning and runs rough when ac or heat on


my guess, car unseen.
car has an A/T trans, and all A/T jump from park to drive
selection is made on a cold engine, due to the very fast idle speed.
what was the park and cold idle speed. and out door temps.
the lower out door temps, make idle speed , cold engine, even higher
but when the engine reaches 180F or more and holds, the RPM
is about 800 RPM (the FSM tells the exact amount and does vary for the unstated engine option) so at 800 the tranny don;t lurch, did it on a hot engine. so if idle speeds are wrong say so and say it with engine temps. or its all meaningless.
next :
runs rough, the engine (even parked?) is called misfire.
misfire on a good engine (full compression)
is:
1: bad spark (or never had a tune up ever) every 60k miles.
2: bad fueling. too rich, too lean (low idle) bad injectors (stuck or clogged, or wrong fuel pump pressure or bad Fuel pressure regulator)
3: bad fuel.

there is a test for each possible failure. all very simple test.
it takes $80 in gauge tools to find engine problems.

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1 Answer

Jeep Grand Cherokee shuts off at idle while stopped. RPM fluctuates then engine eventually dies.


your idle air control valve is going out located behind the throttle body.

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IDLE IS SURGING,START IT AND IT GOES TO2000 RPM COMES DOWN TO 1000 RPM,GOES BACK UP TO 2000RPM THAN COMES DOWN TO AROUND TO1000 THAN BACK DOWN TO 600 RPM, I HAVE CHANGED THE idle sensor motor at a cost of...


An exhaust leak ahead of the O2 sensor can cause this. Air leaking in gives it an inaccurate reading. Check ahead of the sensors for telltale black sooty streaks at your exhaust joints and tighten any you find loose. You can temporarily cover any small holes with some muffler tape as well. Hope this helps.

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Should idle at 750-875. I would not exceed 950 and would not go below 700.

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