Rockfrog Posted October 31, 2016 Share Posted October 31, 2016 Hello, was just wondering if the 1990 2.5L tps is the same as one from a 4.0L? Buddy of mine has a 2.5L that is revving up and down at part throttle. Figuring to see what can be done cheaply - as in if I have any parts that will work for him? What causes should I look at? 1990 2.5L 5spd (looks to run the Renix system) .... Could a Bad IAC be another possible culprit? O2 sensor? He's put a new fuel pump in a few months back already. Sent from my SM-G930W8 using Tapatalk Link to comment Share on other sites More sharing options...
cruiser54 Posted October 31, 2016 Share Posted October 31, 2016 don't know for sure. some parts catalog shed some light....holding baby now. sorry for punctuation. Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 31, 2016 Share Posted October 31, 2016 Hello, was just wondering if the 1990 2.5L tps is the same as one from a 4.0L? The 2.5 and 4.0 TPS have different part numbers, so probably not interchangeable. Also the manual and auto tranny models use different TPS's for each. Link to comment Share on other sites More sharing options...
cruiser54 Posted October 31, 2016 Share Posted October 31, 2016 you can use an auto tps on a manual. just won't usw the trans pigtail. keep in mind the tps difference between 2.5 and 4.0 could be the length of the harness. Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 31, 2016 Share Posted October 31, 2016 you can use an auto tps on a manual. just won't usw the trans pigtail. That's for the 4.0. How about the 2.5? Link to comment Share on other sites More sharing options...
Rockfrog Posted October 31, 2016 Author Share Posted October 31, 2016 The 2.5L lists as a Standard Th31... I'm thinking it may mean that it uses an unmodified GM part... Does anyone have the TPS wiring pinout for a 1990 2.5L to confirm? The 4.0L used a TH32 with a modified pinout specific to Renix. By re arranging the wires I have modified my own 4.0 to use the GM part instead of the AMC variation. I would like to confirm the 2.5's needs if possible. Sent from my SM-G930W8 using Tapatalk Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 31, 2016 Share Posted October 31, 2016 That info should be in the electrical FSM. Since the 87-90 models use the same TPS, you can download the 88 electrical manual here: https://onedrive.live.com/?id=C40904CFDA278A46%21115&cid=C40904CFDA278A46 Link to comment Share on other sites More sharing options...
cruiser54 Posted October 31, 2016 Share Posted October 31, 2016 2.5 TPS A Yel/Grn TPS input to ECU B Brn/Tr TPS ground at ECU C Red/Tr TPS 5 volt supply 4.0 TPS A LtBlu TPS 5 volt supply B Brn/Tr TPS ground to ECU C Yel/Grn TPS input to ECU Link to comment Share on other sites More sharing options...
cruiser54 Posted October 31, 2016 Share Posted October 31, 2016 That info should be in the electrical FSM. Since the 87-90 models use the same TPS, you can download the 88 electrical manual here: https://onedrive.live.com/?id=C40904CFDA278A46%21115&cid=C40904CFDA278A46 Or just read Post 8..... Link to comment Share on other sites More sharing options...
HOrnbrod Posted October 31, 2016 Share Posted October 31, 2016 Link to comment Share on other sites More sharing options...
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