wont idle.. with video

2006 KJ · **Posted:** Wed Nov 19, 2008 6:55 pm

well.. yesterday my jeep started acting up.. it will idle.. then it sounds like something kicks in (dont know what it is... maybe ac compressor?) then it will raise anywhere from 200 to 500 rpms.. stay there for a few seconds then drop 1500-2000 rpms.. i videoed it and you can see it below..

anyone have any idea what this could be? i cleaned the air filter.. throttle body.. and made sure all the plugs were connected in the engine bay.. i thought maybe it was a throttle positioning sensor? or something with the ac compressor.. or just my electronics going haywire..

this video below is right when i started it.. i'm not touching the gas at all... it's just about to repeat what it did first when the video shuts off.

if you listen close you can hear whatever kicks in kick in.. kinda like a wushing air noise

no lights came on on the dash.. and it doesnt seem to be running rough at all... i'm stumped

omGoddard · **Posted:** Wed Nov 19, 2008 7:03 pm

My old grandprix used to do that once in awhile, start up, rev up, then fade out.

I think I ended up replacing the o2 sensor.

Couldn't be certain on the jeep though.

jeepmedic46 · **Posted:** Wed Nov 19, 2008 7:26 pm

Think its the o2 sensor

SoDakJeep · **Posted:** Wed Nov 19, 2008 8:20 pm

what about a vaccum hose?

tommudd · **Posted:** Wed Nov 19, 2008 8:32 pm

SoDakJeep wrote:

what about a vaccum hose?

thats where I would start since there is no code showing up...yet,

course I could be wrong someone told me I was before so ..... :wink:

tjkj2002 · **Posted:** Wed Nov 19, 2008 8:43 pm

Check your battery(unhook,let sit for a few mins,then re-hook back up),that or your IAC went south.

2006 KJ · **Posted:** Wed Nov 19, 2008 9:30 pm

tjkj2002 wrote:

Check your battery(unhook,let sit for a few mins,then re-hook back up),that or your IAC went south.

what is the IAC???

also.. i have another hint...

when i have everything heat/ac wise off it does not do it (turned to the O.. whole way to the left on the dial so that nothing is on)... then when i put it on anything else when the compressor engages it does it again.. humm

jjfgt01 · **Joined:** Tue Nov 11, 2008 1:26 pm **Posts:** 8

AC Compressor going bad and drawing too much power?

2006 KJ · **Posted:** Wed Nov 19, 2008 9:44 pm

thats kinda what i'm thinking.. maybe it's trashed on the inside and sucking too much juice.. then staying open too long and stealing all the RPM's..

seems strange that the AC compressor would go bad in 22,000 miles though...

SoDakJeep · **Posted:** Wed Nov 19, 2008 10:00 pm

IAC is the (intake air something) I believe you said you cleaned your throttle body so maybe check around there?

tmaxx26power · **Posted:** Wed Nov 19, 2008 10:50 pm

IAC stands for Idle Air Control Motor

2006 KJ · **Posted:** Wed Nov 19, 2008 11:45 pm

tmaxx26power wrote:

IAC stands for Idle Air Control Motor

ohh that's the technical name for that thing.. i always called it the "throttle positioning sensor" haha.. on the drivers side of the throttle body i believe..

i thought that's what was wrong too.. so i cleaned it (after the problem had started) no dice.. it's going in for to the stealer monday for a fix.. i figure why change parts myself when it's free under warranty! after further investigation i'm almost positive it's the AC compressor.

omGoddard · **Posted:** Thu Nov 20, 2008 12:10 am

Can you unplug the TPS? My cousin's bonneville was reving by its self at times, so he unplugged the tps to check and it was fine.

Xodius · **Posted:** Thu Nov 20, 2008 12:36 am

With you saying that with the Heat/AC off it doesn't do it I would third of fourth the AC compressor going out...perhaps there is a bad wire coming from it? hmmm will have to think more on this one.

*edit*
Long shot but could it be something on the belt? Perhaps the tensioner is loose just enough when the ac is kicked in and causing more drag on the belt? Just pulling that out of my arse.

2006 KJ · **Posted:** Thu Nov 20, 2008 1:00 am

very good idea! didnt think the check the tensioner or belt itsself... i'll check that out in the morning and see if it gets me anywhere

rt_power · **Posted:** Thu Nov 20, 2008 10:14 am

just try unplugging the compressor. or run it either with no ac or no defrost. see if that removes anything from your problems

2006 KJ · **Posted:** Mon Nov 24, 2008 8:16 pm

just wanted to let everyone know just incase someone has this problem in the future..

took it to the dealer today (since it was under warranty...) and they said it was the "idle motor" i dont know where or what that is... but they are changing it and hopefully that fixes it...

UPDATE- got it back today and it was the IAC motor they changed.. thanks whoever said that was the problem in the first place.. would've been very helpful if i was out of warrenty

Jeepjeepster · **Posted:** Tue Nov 25, 2008 9:31 pm

Yea, thats probably the IAC.

The TPS and IAC are totally different things.

Tps=Throttle position sensor

IAC=Idle air control

wont idle.. with video

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