90XJNSD

My 90XJ auto 2wd, is shifting kinda slow and sluggish, I replacesd the TPS and did a tune-up to it, it actually feels like it has more power, its just shifting kinda weak, like it doesn't want to shift. Thanks for the help and advice!!

The Rooster

Have you checked your trans fluid to make sure it is full? and what color is your Trans fluid?

90XJNSD

Yup, fluid level is good

The Rooster

What color is your fluid? have you ever changed it?

90XJNSD

I've only had the jeep about a month and a half, the fluid is reddish, like most tranny fluid

CRoading

Have your tranny check by a mechanic... If trans fluid was good then it must be be the tranny itself...

tjwalker

Did you ADJUST the new throttle position sensor you installed? Must be done with a meter.

Adjustment is very important and all new TPS units require adjustment after installation.

TPS is directly involved with shifting characteristics on the AW4.

90XJNSD

No, i did not adjust it, when i looked at it, it seemed like you couldnt adjust it, is there a write up on adjusting these, I wouldnt know how to adjust it. Thanks!!

98jeepsrt6

Also adjust your kick down cable.. It will be attached to the throttle body and follow it to the tranny.. on the bracket there is a button, with the engine off open the throttle to WOT.. press in the button and youll see the cable shift back into place. once thats done take it for a drive and see how it goes..

Cant find the write up about it, but if you look around im sure it will pop up.

tjwalker

1. Here is a link on a thread explaining how to adjust the TV cable

http://naxja.org/forum/showthread.php?t=1015963

2. More on the TPS for 87-90 4.0
---------------------------------------------


RENIX TPS
(Thanks to Joe Peters from NAXJA for this information)

MANUAL TRANSMISSION:

RENIX manual transmission equipped XJs have a three-wire TPS mounted on the throttle body. This manual transmission vehicle TPS provides data input to the ECU. The manual transmission TPS has three wires in the connector. Wire "A" is positive. Wire "D" is ground. Remove the three-wire connector from the TPS. Key ON, measure voltage from "A" positive to "D" ground. Note the voltage reading--this is your REFERENCE voltage. Now, reconnect the three-wire connector to the TPS. Key ON, back-probe the connector at wires "B" and "D". Measure the voltage. This is your OUTPUT voltage. Your OUTPUT voltage needs to be seventeen percent of your REFERENCE voltage. Adjust the TPS until you have achieved this percentage, if you can't achieve the correct output voltage replace the TPS and start over.

AUTOMATIC TRANSMISSION:

RENIX automatic transmission equipped XJs have a TPS with two connectors. There is a three-wire connector, same as the manual transmission vehicles have, and it is tested the same as the manual transmission equipped vehicles--FOR ENGINE MANAGEMENT RELATED ISSUES. However, the automatic TPS also has a four-wire connector. For the automatic transmission equipped vehicles the four-wire connector provides data to the TCU. Disconnect the four-wire connector. Key ON, measure voltage between "A" positive and "D" ground. Note the voltage. This is your REFERENCE voltage. Now, reconnect the four-wire connector to the TPS. Back-probe the connector at wires "B" and "D". Measure the voltage. This is your OUTPUT voltage. Your OUTPUT voltage needs to be eighty-three percent of your REFERENCE voltage. Adjust the TPS until you have achieved this percentage, if you can't replace the TPS and start over.

So, if you have an automatic equipped XJ your TPS has two sides--one side feeds the ECU, and the other side feeds the TCU. If you have TRANSMISSION issues check the four-wire connector side of the TPS. If you have ENGINE issues check the three-wire connector side of the TPS.

For those with a MANUAL TRANSMISSION--the TPS for the manual transmission XJs is stupid expensive. You can substitute the automatic transmission TPS which is reasonably priced.