99 jcg xmission problems...

99 jcg 150k. just cruising along at about 65 and suddenly the car jerks, the check engine light comes on and now is slow to accelerate and won't shift into overdrive. I continued to drive to my destination and left it in park for about 45 minutes. Come out and start it up and the check engine light is still on but the drivetrain seemed to behave a little better. It has been making jerks and slips but never this bad. Is this something as simple as transmission fluid? Any help would greatly be appreciated. Also, I seem to have the same problem as anybody else with the heat in the car. Has anyone successfully completed that job on their own, or is it just worth forking up the money?

I have a Jeep Cherokee 1994 4.0 6cyl automatic. Mine does the same jerking on the highway going about 55-65 mph with rare slipping of trans. when driving in the city. I love my Jeep and was told it was the throttle position sensor, so it was replaced, but still does it. Did you find anything out on yours ? It sounds like mine....and I am dying for an answer. I thought it was the trans but not sure.

i ran the codes in my jeep and it came back the output/input speed sensor on my transmission. it is an inexpensive fix and i plan on doing that in the near future and then go from there. i will keep u posted.

Where did you get your codes ran ? Is there a place to plug something in ? Is there a device I can purchase ? In my newer car there is a little plug under the dash but I didn't see one in the Jeep.

JMZ_INDY - You can read the codes yourself on a '94 by counting the flashes on the Check Engine Light. The codes will be two digit numbers ranging from 11 to 63. You may get several codes, but at a minimum, you will get code 55, which signals the end of the code check. If you only get code 55, that's a good sign, but not always the whole story. To read the codes, use the ignition switch. Turn it from off to on and back to off rapidly three times, leaving it on the third time. Then watch for the check engine light to flash. Count the flashes between long pauses, and assemble the two digit numbers. You can repeat the ignition switch sequence several times to get the hang of it. Then, post the codes you get and I'll tell you what the manual says it could be. Or, you can search this site and find other threads that list the codes, but don't use any that are '96 or later, only '95 or earlier.

Did you ever get this problem resolved. What is the cost of the sensor and where is ti located?

Thanks

Did you ever get this problem resolved. What is the cost of the sensor and where is ti located?

Thanks

I just fixed my boss' wifes intrepid about 2 months ago because she had a bad input and output sensors they were like $17 each and took about 10 minutes to replace them both. The problem they were having is when they were driving along it would shift a lil hard then when they come to a stop it and start again it would not upshift just stay in 1st or 2nd gear, they would have to shut the engine off and restart it again for it to work fine or when coming to a stop put it in NEUTRAL then it would be fine - end result the trans was getting stuck in limp mode because of a bad input speed sensors.

The TCM uses signals from the Input and Output speed sensors to calculate slippage in the trans (mainly torque converter) and when the TCM picks up a certain amount of slip it shuts the trans down (puts it in LIMP MODE) so no damage is done.

JUST A LIL INFO.