1997 wrangler 2.5l 5 speed high idle.
 

recently purchased a 1997 jeep wrangler w/ 4cyl. 5 speed, no a/c. when the jeep warm up to operating temp. it idles @ 1500rpm. I've replaced the AIC control, the TPS, recent tune up. spayed around the intake and checked all lines for vacuum leaks and still having same problem. can anyone help ?

Re: 1997 wrangler 2.5l 5 speed high idle.
 

Maybe your throttle return spring is worn or broken.
Have you tried to see if you can pull any codes?

Re: 1997 wrangler 2.5l 5 speed high idle.
 

throttle spring is fine. it's seems that as the temp goes up so does the idle. if i shut it off for a few minutes the idle is reduced, then i drive it again and the idle raises to about 15 or 1600rpm's. i put it on a actron scanner and there are no codes to read.

Re: 1997 wrangler 2.5l 5 speed high idle.
 

Sticky throttle cable?
Dirty throttle body?
With a Manifold Pressure sensor (MAP) the PCM can interpret a vacuum leak as throttle input and won't necessarily kick out a code. You may want to re-check for a vacuum leak.

Re: 1997 wrangler 2.5l 5 speed high idle.
 

hey thanks for all the help. the intake manifold rear bolt that is by the firewall was loose. problem solved.

Re: 1997 wrangler 2.5l 5 speed high idle.
 

I should check my intake manifold bolts as well. Maybe that would fix my whistling engine.

Re: 1997 wrangler 2.5l 5 speed high idle.
 

it funny but they seem to just come loose. i suggest everyone check the that all bolts are tight.