Irregular Idle

WickedKingWicker · **Joined:** Thu Oct 28, 2010 9:52 am **Posts:** 14

Im running into an interesting problem. I have an 06 Liberty and I am the second owner. It's still stock. The problem is that when you turn the AC on or the heat, the idle bounces between 900rpm and 350rpm somewhat at a fast pace and also stalls continuously after a period of time. There are no engine codes or even a misfire for that matter. It stops the irregular idle immediately after you turn the AC or the heat off. Ive been working on cars since i was 6 so I'm definitely not illiterate but the new electronics on these cars have me pulling my hair out. Was wondering if any of you guys have ran into this problem or know of the cause.

By the way, your site is way for informative than jeep forum

No idea why it took me 6 years to find this site

Straight6Jeff · **Posted:** Thu Oct 28, 2010 11:43 am

Sounds like it could be a dirty TB. Remove the TB from the manifold, clean the carbon out of all idle air passage, behind the blades, everywhere. Then clean it again.

Total r&r time will be about 20 minutes.

the gasket is reusable.

tommudd · **Posted:** Thu Oct 28, 2010 11:49 am

Plus when was the plugs replaced last, if you're not sure maybe a good time to throw some new ones in.

WickedKingWicker · **Joined:** Thu Oct 28, 2010 9:52 am **Posts:** 14

Actually replacing the plugs as we speak. That back passenger side plug is a PAIN :banghead:

I'll check the TB also while I'm out there. Appreciate it guys.

JeepinJarhead03 · **Posted:** Thu Oct 28, 2010 4:08 pm

plus and cleaning the tb are two good starting points if you know they're due

bad battery can also cause a similar issue, however mine never really bounced from 350 it just knocked off..

if it still has the original battery it may be tryin to tell ya somethin

WickedKingWicker · **Joined:** Thu Oct 28, 2010 9:52 am **Posts:** 14

Replaced the plugs and the battery is brand spanking new. Still doing the idle non sense though. I'll eventually track it down. With a name like Jeepinjarhead, were you in the Corps?

JeepinJarhead03 · **Posted:** Thu Oct 28, 2010 8:00 pm

Good deal on the battery then i guess?

Has it been doing this since before the new battery? 19 times out of 20 when there's issues with the TPS or IAC it throws a code, however, pull the IAC and check the port in the TB for gunk, the IAC often gets some build up around the cone of the plunger which can cause some erraticness

however, idling like that.. i'm surprised it's not throwing a code of some SORT if not a simple result of the momentary low idle when it drops

make sure all your vac hoses near the Master cyl are on good and not burned/cracked - except.. usually if ya got a bad enough leak there to cause a weird idle.. it's gonna show a code

other than the idle, does it drive ok and appear to have normal acceleration etc?

and yes I was in the Corps, Ooh, and or, Rah

Jeepjeepster · **Posted:** Thu Oct 28, 2010 9:27 pm

Unplug the A/C compressor then turn the heat on and see if it still does it. Your A/C runs with the heat on b/c Chrysler is stupid.

If it doesnt do it then, something may be up with the compressor.

WickedKingWicker · **Joined:** Thu Oct 28, 2010 9:52 am **Posts:** 14

Just a quick update. It's fixed. I found a leaking vacuum hose.....so i replaced them all

JeepinJarhead03 · **Posted:** Tue Nov 02, 2010 2:24 pm

awesome! Good deal!

Irregular Idle

Who is online