I have a 1997 xj, 4.0 HO, Auto tranny.

Its running around 2000 rpm's at 60mph and wont shift untill around 2300 rpms. Im getting around 10mpg. I just replaced the TPS and cleaned the throdle body and IAC. And now its idleing fine when i start it but then after i drive it it idles around 1400 rpms. Any ideas or suggestions?

 

search "high idle" not to be an ***** but there is just too many things that can cause it i.e. vacuum leaks, cracked exhaust, it could be more than one issue causing the problem so research everything
I did like 5 things and every time my idle came down just a bit

 

My main concern isnt the high idol, its that its running at 2000 rpm's at 60mph and killing my gas mileage.

 

Then I'll be watching cuz I do around 2400rpm cruising at 65mph on 235/75 r15 with 3.55, I've been hitting 15mpg avg

 

Alrigt. And sorry if maby im askin stupid questions or i dont know what im talking about. Im new to the cherokee world and im trying to learn as much as i can. Im going into the Fire dept. so im used to being the rookie and getting my *** handed to me a few times

 

I mean I have a similar problem, my old xj never had to rev that high and neither do my buddies jeep I just refuse to go to a shop

 

Basically your saying your not shifting into OD until 2300rpms or are all of your shifts late ? Once my jeep gets above 2000rpm I can hear the sucking sound of 4$ a gallon gas...

 

All of my shifts are late. I do my best to keep it under 2000 rpm but it would take me like 2 min to reach 45mph. When it shifts into 2nd and 3rd it only drops like 200 maby 300 rpm. But when it shifts into 4th it goes down to around 1300 and then climbs from there as i accelerate. So idk. I got the xj on tuesday and im just tryin to work out all the buggs. Maby thats normal?

 

My 90 does this, im told to replace the TPS and have it set correctly, but it sounds like another issue for you. My 97 on the other hand shifts great, Overdrive kicks in at 41 mph everytime, i run 70 mph right at 1900 rpms. 31's with 3.55s. is yours 3.55 gears? what size tires?

 

3.55's on 235/75/15's

 

have you ever adjusted the detent/kick down cable

 

Nope. Is that what this is? https://www.cherokeeforum.com/f2/free-quick-fix-41821/

 

thats it it controls valve pressure in the tranny for shifting and trans mission kick down

 

alright. ima try that real quick. ill let you know what happens

 

Alright so i adjusted my detent/kick down cable. all my shifts are around 2000 rpm and at 45mph im doing 1500rpm. sound correct to you or is that still high?