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:
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.If you're experiencing idle issues on your Jeep Wrangler TJ the most likely culprit (and the first thing you should check) is your IAC (Idle Air Controller). Often times the IAC gets very gunked up causing the Jeep to idle improperly. A simple cleaning is usually all it takes to get it running as good as new.
If you end up needing to replace your IAC valve (they do fail on occasion), you can find the part numbers (and the links to purchase them on Amazon) below:
2005-2006 IAC Valve (Part # 4861552AC)
1997-2004 IAC Valve (Part # 4874373AB)
There is no need at all to remove the throttle body to clean the IAC. This is probably one of the easiest and cheapest things you can do.
Below you'll see a diagram of the top of your throttle body with the IAC sensor labeled.
View attachment 14140
Take your IAC off (it's held on by two small torx screws). Clean it with your throttle body cleaner, this is what it will look like before and after.
View attachment 1798
View attachment 1799
Then take off the IAC housing and both sides (house and throttle body). clean that too. before and after...
View attachment 1800
View attachment 1801
View attachment 1802
Put it all back together and you're good to go. Very, very simple. It doesn't get any easier than this!
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 againChris, 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.
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.
It rolls over and over but will not fire unless i give it a little throttle, then it wont idle.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?
It rolls over and over but will not fire unless i give it a little throttle, then it wont idle.
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.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.
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.
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 crossedSounds 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.
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
View attachment 69703
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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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!If you're experiencing idle issues on your Jeep Wrangler TJ the most likely culprit (and the first thing you should check) is your IAC (Idle Air Controller). Often times the IAC gets very gunked up causing the Jeep to idle improperly. A simple cleaning is usually all it takes to get it running as good as new.
If you end up needing to replace your IAC valve (they do fail on occasion), you can find the part numbers (and the links to purchase them on Amazon) below:
2005-2006 IAC Valve (Part # 4861552AC)
1997-2004 IAC Valve (Part # 4874373AB)
There is no need at all to remove the throttle body to clean the IAC. This is probably one of the easiest and cheapest things you can do.
Below you'll see a diagram of the top of your throttle body with the IAC sensor labeled.
View attachment 14140
Take your IAC off (it's held on by two small torx screws). Clean it with your throttle body cleaner, this is what it will look like before and after.
View attachment 1798
View attachment 1799
Then take off the IAC housing and both sides (house and throttle body). clean that too. before and after...
View attachment 1800
View attachment 1801
View attachment 1802
Put it all back together and you're good to go. Very, very simple. It doesn't get any easier than this!
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.