Cleaning IAC and Throttle body write up (for dummies) - Page 8 - JeepForum.com
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Unread 05-23-2011, 06:48 PM   #106
mkjohn
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1998 TJ Wrangler 
 
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Best Post i have ever seen! Did it this weekend...
Unfortunatly, Jeep still runs ruough for fifteen seconds or so when temp hits around 150. Smooth after that...

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Unread 06-11-2011, 04:27 PM   #107
Rubes
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Best "how to" post ever! Thanks...I cleaned mine of my '01 WJ. She's purring like a kitten now...
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Unread 06-22-2011, 10:49 AM   #108
MODUS
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great post

did all that work but still having idle problems.
most times start at 2500 rpm and after 3-5 seconds drop to 1100.
1100 is where it idle all day driving in the city. if i step a bit the gas it drop down to 900.
a few days ago thinks got worse. when i stop the car it drops down to 200-400 and up again to 1000 rpms.
what do you think guys? 2001 4.0 tj with edge 62mm tb. no codes!
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Unread 06-22-2011, 04:16 PM   #109
rgstj
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O-ring gasket 05-05

Is there any place that has O-ring gaskets for the 05 IAC.
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Unread 06-23-2011, 07:01 AM   #110
mkjohn
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I didn't have the exact same problem but had the rough idle problem and a drop in rpm's as you push the gas. I cleaned the throtle body as in this post, but that didn't help. in the end it wa the upstream O2 sensor. A simple test is to just unplug it and see how the engine runs. It will throw a code while unplugged but if it runs smoother you found your issue. A simple check.
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Unread 06-28-2011, 04:01 PM   #111
AKShaolin
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Just did this on my 98 ZJ. Screws were pretty frusterating to get at (I left the TB in because I wanted to just do a quick clean). Sure enough, my RPM went from 2500-1500 upon startup to a nice low 1250-750. Worked like a charm, awesome guide.
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Unread 06-28-2011, 04:08 PM   #112
AKShaolin
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Quote:
Just did this on my 98 ZJ. Screws were pretty frusterating to get at (I left the TB in because I wanted to just do a quick clean). Sure enough, my RPM went from 2500-1500 upon startup to a nice low 1250-750. Worked like a charm, awesome guide.
Forgot to mention. What I did was unscrew both the IAC and 3/4 screws on the piece directly attached to it. Then I took off the tube attaching to the TB opening so I could swing around the piece on the side and clean everything. Wasnt super practical, but it worked out. I would definitely suggest taking off the whole TB if you have the time, but it still worked for me.
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Unread 06-28-2011, 04:14 PM   #113
conrasm
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Quote:
Originally Posted by MODUS View Post
did all that work but still having idle problems.
most times start at 2500 rpm and after 3-5 seconds drop to 1100.
1100 is where it idle all day driving in the city. if i step a bit the gas it drop down to 900.
a few days ago thinks got worse. when i stop the car it drops down to 200-400 and up again to 1000 rpms.
what do you think guys? 2001 4.0 tj with edge 62mm tb. no codes!
How's your throttle response when you press on the pedal? Is there a slight dead spot with light pressure on the pedal? Could be TPS. Had similar problems on my wife's GC and intermitent stalling at stop signs and even while driving. Her's threw a code suggesting MAP or TPS malfunction. I cleaned the IAC bc she was also having some erratic idling with RPM's bouncing from ~400-1200. After cleaning and new TPS, running much better.
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Unread 06-29-2011, 01:14 PM   #114
MODUS
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throttle response is just fine. no dead spot either. still start at 2500 rpm and very slowly drop to 1000 1100rpm. that with the RPM's bouncing think start make me grazy
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Unread 07-11-2011, 09:09 AM   #115
srfnfly227
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Quote:
Originally Posted by fishinjeeper View Post
Yes, that happened to me. I believe its because there it was not completely dry. But after it warmed up, I have not had that problem since




It appears that there is one small screw or bolt in your IAC. you will need to take that out and then your IAC should come right out. Here are the pictures of your IAC and you can see the one screw hole
Does anybody know if this piece can be taken apart at all? I got it off without a problem, but there really isn't much to clean if it doesn't come apart.

Edit: pictures didn't come with the quote. It's the IAC for a 2006 4.0L
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Unread 07-27-2011, 10:08 AM   #116
berryjr
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I cleaned my IAC and it worked great! A couple of notes: be very careful with the gasket, Jeep doesn't sell it separately and neither do the auto parts stores I checked. I had to buy an adhesive backed thermostat gasket and cut it to fit. Also, I think I saw mention of rtv in this thread - I was told by the parts guy at Jeep that rtv doesn't do well near fuel... FYI
Thanks for the great writeup!
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Unread 07-27-2011, 10:42 AM   #117
spyder98
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What gaskets/orings do we need to fully do this on our jeeps? I want to buy everything before I start it
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Unread 08-05-2011, 03:10 PM   #118
berryjr
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Quote:
Originally Posted by spyder98 View Post
What gaskets/orings do we need to fully do this on our jeeps? I want to buy everything before I start it
"adhesive backed thermostat gasket" is all I had to get. Ask for it at the auto parts store. And you will need a good razor or Xacto knife to cut it to fit.
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Unread 08-06-2011, 03:25 PM   #119
mamelukesword
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Trying it tomorrow. My LJ runs rough when it is restarted with the engine near operating temp.
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Unread 08-16-2011, 04:41 AM   #120
ImaginaryFriend
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Excellent post and write-up. Not a hard job at all, but it's always nice to have some pictures and directions even for the simple things.

I hadn't run my A/C in over a year and when I finally got it fixed, my Jeep would sometimes stay at high RPM's (~2000) when idling. This usually happened when I was pushing in the clutch when coming to a stop. Cleaning the IAC did the trick. It was really dirty!

One note...after reading all the talk about the IAC gasket, I decided to not remove the IAC housing. It probably took a little longer and I used a little more TB cleaner, but it can be cleaned without removal. Both little chambers are accessible not only through the sensor hole, but there are two openings in the TB itself.

My Jeep is back to idling smooth. Thanks.
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