mushratt

ok on my 94 grand cherokee limited when you start it up it was idling real low,i changed the IAC about a month ago and was idling great.well yesterday it starts idling really low to the point that it almost died ,so i pull the throttle body off and clean it the iac had black on it again so i cleaned it as well put it back together started it up and well it idled down to about 100 on the RPM and will not idle any higher.is there somthing im missiing here ?what else could it be anyone have this same problem ?thanks David
P/S it drives great and runs great when your going down the road just the low idle

cherokee93pete

T.P.S ?

mushratt

thank you sir i will give it a try.
Does anyone know if the TPS can be chked?

mushratt

this is some bull crap,i just bought a brand new TPS started bolting it on and the front cover falls off im headed to idiot zone to get a new one

mushratt

Ok just replaced the TPS and no change whatsoever!!!!so where do i go next???Any ideas maybe the IAC went bad again?i did by it from autozone.IM lost ,think i will blow this pile of sh!!! up and by my son a FORD.

ol"blue

My guess would be the IAC (Idle Air Control) valve on the throttle body for your 5.2L.
Dan

mushratt

Dan thanks so much for your help sir,I pulled it again and the plunger on the end was all the way out so i adjusted it once again and screwd it in ,then started it up and it run perfect,drove it for about 2 miles to get some gas and it started idling back down to about 100 RPMS.I Beleave it is a faulty IAC ,am i wrong for thinking this way?the IAC was just replace a few months ago.Thanks so much once again all the help really is apreciated.
Thanks David

mushratt

Also when i get another IAC do i really need to adjust it or just put it in and drive it ?
Thanks David

ol"blue

I can't say for sure as I'm in Mich. visiting and am away from my source of info. All I have is my brothers Haynes manual (which doesn't tell me anything about the IAC), and his lap-top. Sorry David I can't be of more help.
I'm sure more people will chime in with some helpful info.
Dan

mushratt

Thanks Dan, for your help sir.
Anyone else know the answer?
Thanks David

cherokee93pete

sorry about the wrong direction i pointed you to i thought you said you replaced i.a.c they are on the same circut so when the computer see's something wrong in the circut it could be any of the sensors good to know the i.a.c was the culprit i dont buy any thing from A.Z i just get the bad ones myself all the time... about adjustments have no clue about that cant find my books anywhere lol??!!!

mushratt

No sir i asked for help and you helpd,nothing to be sorry for.And i did replace the IAC but its not working properly.And once again thank you sir for your help.
Thanks David

mushratt

OK guys bringing it back to the top because we drove it for one day and the same thing is happening,idles low,and when you first start it you have to have the gas pedal pushed before it will start.Maybe the computer going bad sending a bad signal?I did notice however that it has a good leak at the manifold ,could this be causing this problem?Any ideas what to do next?
Thanks David

ak81jeep

did you clean where the plunger of the aic seats if it`s still carbon up you`ll have the sam problem, also check for vaccum leaks.

ol"blue

Where is the leak? Need a better description.
Dan