1995 xj 4.0

[Papa_Jon]

Idle is hanging around 1200 rpms . Notice it don't drop when in put in gear doesn't move at all stays same. Cold or at normal operating temperature.

 

[Papa_Jon]

Just notice there is no change when i unplug IAC .. i removed it to clean it. Is the plunger suppose to move? This is stuck out

 

[skyhighZJ]

Yes it’s supposed to move

 

[shelby27604]

If not the IAC, next would be to check for a vac. leak

 

[Papa_Jon]

Yes it’s supposed to move

Can't move it all ,even tapped it with hammer plunger standing strong.. guess I'll throw one on it ...

 

[skyhighZJ]

The iac is supposed to move as it allows air to by pass the throttle plate to manage engine idle. The thing that is curious is typically if it’s stuck “closed” (in the extended position) it should choke the engine like its stumbling. Either way it should move but the high idle sounds more like a vacuum issue like @shelby27604 said.

 

[Papa_Jon]

Most of vaccum hose have been replaced . Unless P.O deleted some thaty needed to be there. Im guessing pvc hose on top of valve cover thaty normally goes to air box has a little filter on it . Has a cone filter t the end of intake tube. Guess i start by replacing IAC then go from there.

 

[skyhighZJ]

Little filter in valve cover is fine as long as the corresponding hole in the air intake tube is blocked off.

 

[Papa_Jon]

Little filter in valve cover is fine as long as the corresponding hole in the air intake tube is blocked off.

on 95 it went to af box which history

 

[skyhighZJ]

Hasta la vista. My ‘97 was gutted too and had a mini filter on the VC

 

[Papa_Jon]

looking at new Iac looks like old one was stuck about half way out , guessing why it ran just idle high

 

[skyhighZJ]

That’s probably the issue then. I’ve heard of people cleaning them but they aren’t that expensive so might as well start fresh.

 

[RenegadeT]

I had a stuck IAC valve on one of my ECORS XJs, same deal with the high RPMs at idle. I had no shortage of parts XJs, so swapping a different one was no problem.

 

[a_kelley]

To be totally correct... The iac is NOT supposed to have a moveable pintle, it should seem stuck. However you should be able to use the scan tool to manipulate it and make it move in and out. If the pintle rotates, it's bad. If the pintle moves in and out under hand pressure, it's bad.

 

[Papa_Jon]

To be totally correct... The iac is NOT supposed to have a moveable pintle, it should seem stuck. However you should be able to use the scan tool to manipulate it and make it move in and out. If the pintle rotates, it's bad. If the pintle moves in and out under hand pressure, it's bad.

Should idle change when its unplugged?

 

[Papa_Jon]

So much shit has been removed from P.O Jeep runs great so far beside tranny slipping , once i get all little shit fixed I'll swap trans out

 

[a_kelley]

Should idle change when its unplugged?

not much.. it only should change it it's moving (and would need to be plugged in).. you should be able to command idle up/down..

 

[Papa_Jon]

Lowest i can get it. New IAC. How do i comand lower and higher. Don't think my soluis will do a 95

 

[a_kelley]

750-800 is normal.

If it's a 95 I can reflash it if you want a lower idle, but that's where it should be..

Commanding it with the scan tool will only result in temporary changes.

 

[Papa_Jon]

$40. cheap double den from Amazon install
Next is lights on roof rack and rod holders and tackle shelfs ... fishing jeep