i am looking at buying a 1990 cherokee 4x4 and the jeep will not shift out of first very easily it wants to just stay in first forever... but will eventually shift and is fine from there on up.. the man that owns the jeep said that it is the TPS (throttle position sensor) and i was wondering if that sounds right or if he is trying to get me...

 

A TPS is cheap... tell him to throw one in and have it shifting properly at time of purchase.

Does it shift correctly when in the 1-2 position?

 

yeah that is what i told him but he said he is selling it cause he cant afford to fix it.. but i am just curious, i don't know much about mechanics but does the TPS regulate shifting?? a buddy of mine said that did not seem right to him but neither of us really know... thanks for the feedback though man

 

from what i have read it has nothing to do with shifting i could be wrong thoe but you should first check the tranny fluid.... the TPS controls an regulates how much air is need to mix with gas an tells the PCM if your at closed or open throttle google search it thats where i found it an does it hesatated in reverse

 

Yes, the TPS does affect the shifting. The flat three pin connector supplies information for the engine, and the square four pin connector supplies information to the tranny. It is easy to test the TPS to see if it's working correctly though as long as you have a DMM.

Here is a link to checking/adjusting the TPS.

 

then i guess its different for a 98 then but i am also getting a 93 4x4 xj here in the next few days cant wait

 

yea mine had the same exact problem...its the TPS all day...they were like $40 from autozone

 

tps can cause the problem. If it is telling the computer that you have your foot on the floor, the trans won't shift until redline. If it is the tps, then it will want to downshift too soon if you slow down a bit. I had the same problem a while back and it was the tps.

Good luck.

 

i appreciate the feedback thanks everyone i bought the jeep and it is all better now it was the TPS!!! THANK YOU!!!