Question about 2004 Jeep Grand Cherokee

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My jeep lurches when I reach 50-60 mph

I drive a 2004 Jeep Grand Cherokee Limited. V8 4x4 4.7 HO. Automatic Transmission
One day I was sitting on an incline at a red light in my jeep and my transmission was in drive and my foot was not on the brake because the incline was steep enough to keep my jeep from moving forward. When the light turned green, I hit the accelerator and I heard a noise and my jeep jerked violently forward. My jeep jerked so violently that I thought someone had run into back of me. After I stuck my head out of the window and realized that no one had hit me, I proceeded to drive. As I was driving down an onramp to enter the interstate, I was approaching about 55 mph and then my jeep jerked forward, and I could hear what sounded like my tires screeching momentarily. Then it did it again. After that it stopped, until the next time my jeep was approaching about 55 mph, which I am guessing would be 5th gear. This only happens when I am at about 50-60 mph and only when I am accelerating. Once I am past this speed range, then the jerking stops, but once I decelerate to below this speed range and then have to accelerate to above this speed range the jerking happens again. Throughout this whole process, my check engine light never came on. So no codes were ever recorded. I figure there is something wrong with my transmission, I just dont know what. Could it be a speed sensor?Now because my jeep has an issue at this speed, I have been keeping off the highways and driving on city streets to keep below 50 mph. However, I am now having another issue. Last week, while driving to work, I was driving in traffic, a lot of slow driving and stopping, and all of a sudden my engine light came on and it felt like my engine had lost half of its power. My engine would rev up with out a lot of forward movement. It was still driveable, it just took more rpms to get my jeep moving. My jeep gives out code "07000" which means there is a transmission problem. After about a day the check engine light went off and everything seemed to work fine, but I still have the high speed issue. Whew! I hope I have provided enough info for you to help me. Thanks for your time.

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  • chynessey Dec 02, 2008

    I figured out that it is a transmission problem before I posted this. I want to know if anybody can be more specific, for instance, is it a mechanical problem or an electronic problem? I flushed my transmission and it did not help.

  • chynessey Mar 16, 2009

    I found out that my Jeep was still under the power train warranty so I took my Jeep back to the dealership. It turned out to be a bad valve body.



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U need a Throttle Position Sensor.  The engine is missing. It is probably time for a tune-up. or at least checking the spark plugs, wires, distributer and cap, air filter, etc. 

If it's jerking back & forth, and not shaking/vibrating.... then it's most likely the lockup torque converter 
also Clean the spark plugs and wires(both sides of the wires and the attaching posts
and also check the shifting gears 

Posted on Dec 02, 2008

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This sound like a transmission problem that need to be checked out.The code 07000 confirmeds this also.

Posted on Nov 28, 2008


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