TPS Symptoms & Figures
#1
Junior Member
Thread Starter
Join Date: Sep 2012
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
TPS Symptoms & Figures
Hi all,
I'm chasing an eractic fuel economy issue. Although the trip computer always shows "generous" figures (between 16-25mpg which is much better than I actually get), my actual economy seems to wonder greatly.
I've also experienced some hesitation so I decided to plug in my OBD2 scanner and view the readings from the TPS as reported by the ECU.
Do these sound correct?
At idle - 15.3%
At full throttle (via pedal or throttle body) - 78%
Surely the max throttle should be 100%, but my main concern is that 15% seems high at rest.
Does anyone have a reading from their 4.0 please?
NB: This is a 1998 4.0 Auto.
I'm chasing an eractic fuel economy issue. Although the trip computer always shows "generous" figures (between 16-25mpg which is much better than I actually get), my actual economy seems to wonder greatly.
I've also experienced some hesitation so I decided to plug in my OBD2 scanner and view the readings from the TPS as reported by the ECU.
Do these sound correct?
At idle - 15.3%
At full throttle (via pedal or throttle body) - 78%
Surely the max throttle should be 100%, but my main concern is that 15% seems high at rest.
Does anyone have a reading from their 4.0 please?
NB: This is a 1998 4.0 Auto.
#3
Junior Member
Thread Starter
Join Date: Sep 2012
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
I'll update this thread myself, in the hope that this helps someone in the future.
Previously, by using an OBD scanner, the TPS was showing 13% at idle and 78% at full throttle. I was getting occasional hestitation and aweful MPG.
I have replaced the TPS and now have 17% at idle and 99.8% at full throttle. I have LOTS more power (massive difference) and I hope this helps my MPG. Time will tell.
Previously, by using an OBD scanner, the TPS was showing 13% at idle and 78% at full throttle. I was getting occasional hestitation and aweful MPG.
I have replaced the TPS and now have 17% at idle and 99.8% at full throttle. I have LOTS more power (massive difference) and I hope this helps my MPG. Time will tell.
#4
Seasoned Member
Join Date: Jan 2011
Location: Grand Haven, Michigan
Posts: 493
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0 I6
not to hijack this thread, but how do you know when your tps is bad?
I kinda like the sound of more power and better mpg...but i dont know how to tell if mine is working or not working right
I kinda like the sound of more power and better mpg...but i dont know how to tell if mine is working or not working right
#5
Seasoned Member
Join Date: Jun 2012
Location: Ronceverte WV
Posts: 427
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1998
Model: Cherokee
Engine: 4.0 I6
Try searching for "tps adjustment"...... Cruiser has an excellent write up for it. I think in 96 it got changed to where you can't adjust it but, in said write up it will give you specific instructions on how and where to get the volt out put from the tps.
I do know that it could cause issues with your engine and tranny if it's failing. I would also advise you to get one from the dealership instead of one from any parts store. I think you can get one from Quadratec that's an oem unit too.
Hope I helped.
I do know that it could cause issues with your engine and tranny if it's failing. I would also advise you to get one from the dealership instead of one from any parts store. I think you can get one from Quadratec that's an oem unit too.
Hope I helped.
#6
Herp Derp Jerp
Join Date: Nov 2011
Location: Parham, ON
Posts: 18,251
Likes: 0
Received 12 Likes
on
11 Posts
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
+1 on cruiser54's writeup. A few changes to your '98 though, its not adjustable and the output voltage at full throttle should be 4.5 volts. The TPS plays an important role in helping the AW4 shift or lock up so this could impact your fuel economy.
Thread
Thread Starter
Forum
Replies
Last Post
jeefersjeepers
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
09-20-2023 12:51 PM
Zerocyde
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
45
06-29-2022 05:51 PM
DBFinney
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
09-24-2015 11:31 PM
hogans 96xj
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
6
09-13-2015 09:11 PM
mtoskippy
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
0
09-03-2015 09:21 AM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)