Just wanted to say thanks for this thread and the very knowledgeable folks on this forum. I completed the IAC and throttle body cleaning today with great success. IAC was removed for cleaning, but not the throttle body. A couple before & after pics:
How to clean your IAC (Idle Air Controller) valve
- Thread starter Chris
- Start date
Thank you everyone for such a great forum!! I did the IAC today, but the top nipple came off to expose a screw and spring, with some lithium grease in there. I don't think I was suppose to disassemble it, but it went back together......I guess. Took off and cleaned throttle body, that went well. Ordered a new IAC, considering the original equipment on the entire vehicle is 19 years old, so it won't hurt to pop in a new $20 part, plus I may have messed it up. Also ordered a new a new MAP sensor and TPS and Coil Pack for good measure. Got them from 1A Auto, links embedded. Reviews looked decent and the prices were the best I could find. Anyone use this online parts store before??? Figure I will pop on the new coil pack when I do plugs Tuesday evening, got Plugs Jerry B. recommended.
While I might be replacing good parts with new, I figure some easy bolt on components are easy for me to do, and a tune up is always a good thing!
It has been interesting working on the vehicle, a learning experience, and I am really getting a better understanding of the Jeep. I will continue to get more ambitious, and have purchased some more tools, and there is great satisfaction in doing work myself!
While I might be replacing good parts with new, I figure some easy bolt on components are easy for me to do, and a tune up is always a good thing!
It has been interesting working on the vehicle, a learning experience, and I am really getting a better understanding of the Jeep. I will continue to get more ambitious, and have purchased some more tools, and there is great satisfaction in doing work myself!
I just did this in my 06, and the IAC is somewhat different, here are a few pics before:
and after:
and after:
Josh Crider
New Member
Chris, would this be a reason why my '99 TJ wont idle if i hot-start? My Jeep drives fantastic, isnt over heating, cranks strong when it cranks, but if ive driven for an hour or so solid and shut the engine off, it wont crank back for a good while.
Josh Crider
New Member
Let me clairify, if i give a little throttle, it WILL crank under this circumstance, but as soon as i let off of the throttle(in neutral/with clutch engaged) it idles all the way down to zero and dies. After i play this game with it about 10 times, it will finally idle at about 200 RPM, where i can drive around the parking lot for a minute, then it bumps back up to 800ish RPM and everything is like normal again
OP
You're saying after a driving it for a while, you turn it off, then go to start it again, but it won't turn over, crank, or anything while it's still hot?
Josh Crider
New Member
It rolls over and over but will not fire unless i give it a little throttle, then it wont idle.
OP
I'd start with the IAC first since it's easy and free.
Have you scanned it to check for error codes?
I heard of an issue like this recently and it turned out to be the CPS had gone bad. Though usually when things like that go bad, they throw check engine lights / codes.
Josh Crider
New Member
I scanned it before and it didnt throw anything but ill try again. Ill also look into the IAC. Im also going to replace the coolant temp sensors this weekend and see if that helps.
OP
Sounds like a plan! Be sure to use OE Mopar sensors or else they'll give you trouble!
Post up the results when you're done.
Josh Crider
New Member
I changed the ECTS and cleaned the IAC this morning and it seems tp be doing good around town but i havent been off anywhere yet. Im going from Atlanta to Blairsville next weekend so fingers crossed
Same setup for my 2006 sport tj. Can these be replaced or would it have to be a new throttle body?
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A bit late, but all of those sensors can be replaced if needed.
TJNUT
New Member
Just saw this thread, I just happened to have done this a couple of weeks ago and it also fixed my idle issue, It wanted to cut off before.
I found some video's on YouTube. One thing that may be relevant is one video suggested to disconnect the battery during this process, it stated that if you don't you could end up with a check engine light that will need to be cleared. I did and had no issues.
Great simple fix, Thanks.
I found some video's on YouTube. One thing that may be relevant is one video suggested to disconnect the battery during this process, it stated that if you don't you could end up with a check engine light that will need to be cleared. I did and had no issues.
Great simple fix, Thanks.
260k on my 03 Sahara and the idle had gotten low and rough over the last couple of months. Pulled the throttle body and disassembled the IAC. Cleaned everything up and it's idling like new. Thanks!
Pulling the throttle body is about a 3 minute job and makes disassembly and cleaning much easier. And no screws dropped into oblivion.
OP
