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I drive a 2000 jeep grand Cherokee Ltd 4.7L it's been idiling high about 1500 higher than normal on start up and stays that way till I put in gear then it drops back down to the normal 500. While driving the vehicle or will jolt really hard then jump up in the rpms anywhere from 500 to 2500 rpms higher, then it will jolt again and drop back down to normal rpm while driving. It doesn't matter how fast I'm going, and this reoccurs frequently while driving. It only does this in freezing wheather from 30 degrees or below never during the spring or summer. I've heard and read many solutions to this problem anywhere from transmission fluid and filter change to fuel pump to the tps. I'm not very mechanically savy so I have no clue what to do. Any help is appreciated thanks.

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Hi Tyler, difficult to say without more details, but it sounds to me like the sensor monitoring the RPM for the engine management unit is faulty and the engine management cannot compensate. Bad connections will give more problems during cold times because metal shrink and connectors might loose contact. Best would be to get it checked out by someone that knows for your safety, this sounds very unpredictable and dangerous. Hope this helps.

Posted on Nov 14, 2014

  • Tyler Fink Nov 14, 2014

    Well it started this last year, and I took it into the jeep dealership and they said they didn't know what was wrong so they just cleaned the o2 sensor and it helped for about a week then went back to the original problem. Also I forgot to mention the the engine code it's throwing me is p0203

  • HalmarV Nov 14, 2014

    There are several sensors that work together, I once had inlet manifold pressure sensor changed, no luck, then whole turbo, no luck, then whole management computer, no luck, in the end, altitude sensor was bad! The maintenance manual only covered the first three items! My error code pointed to first sensor, replaced for nothing!

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Posted on Jan 02, 2017

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SOURCE: 2004 jeep grand cherokee idling problem. Revs motor 200 to 500 rpms higher while driving.

I had the exact same problem on my 04 GC. I put some Techron Concentrate Plus Fuel System Cleaner in from Wal-Mart and it seemed to fix the problems right away. Let me know.

Posted on Jun 01, 2009

  • 6982 Answers

SOURCE: 96 Jeep Cherokee RPM Surge While Driving

If the problem began before you changed the plugs that they are likely OK...Some engines "like" certain brand plugs better than others. You may have a weak ignition coil. Poor spark will generally show up at higher rpm's. Spark should be blue and have good "snap" to it and should easily bridge a 1/4" gap or better. If fuel was contaminated, it should show up at lower rpm's as well. System cleaners sometimes work but often are added far too late to do any good. (tank can hold up to a gallon of water without noticing it.) I use 3oz of acetone and one oz marvel oil per 10 gallons of fuel about once a month...cheaper and more effective than most cleaners. (and does not "melt" gaskets and seals as legend has it) The vehicle speed sensor can also give you problems but needs testing to determine if it's got any problems.
It's difficult to diagnose by remote control, but I hope you benefit form something here!

Posted on Jun 12, 2009

  • 15 Answers

SOURCE: I have a idle problem with my passport when I

have you checked for vacuum leaks?

Posted on Feb 04, 2010

  • 91 Answers

SOURCE: Tranmission will not shift into next gear from

Try changing the transmission fluid and transmission fluid filter. It is a fairly easy but kind of messy job. Just buy the new fluid and filter, Grab your metric socket set and go at it. NEVER WORK UNDERNEATH A HOT VEHICLE. You have to pull the transmission pan to do this job. When you break the gasket seal several quarts (liters) of transmission fluid will cascade down on you. Be ready for it. Don't forget that when it stops draining there is still a lot of fluid left in the pan. When you finish cleaning up the fluid clean the gunk out of the pan. Install the new filter and reinstall the pan with a new gasket. Do not over torque the pan or filter bolts. If you strip them out or break them off you will need professional help to repair it. Refill the transmission with fluid. It should take six or seven liters.

Posted on Mar 20, 2010

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