Cleaning IAC and Throttle body write up (for dummies) - Page 16 - JeepForum.com
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Unread 09-23-2013, 09:10 AM   #226
Ajcobosco
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Quote:
Originally Posted by Knuckelhead

No, it's an air valve controlled by the PCM to maintain proper idle rpm...
Interesting and cleaning this will help smooth the idle? Mine sounds like it's got a jumpy idle but the tac doesn't move much. Also the 4.0s do not have a mass flow air sensor does it?

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Unread 09-23-2013, 01:11 PM   #227
Knuckelhead
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Quote:
Originally Posted by Ajcobosco View Post
Interesting and cleaning this will help smooth the idle?
It might.
Quote:
Originally Posted by Ajcobosco View Post
Also the 4.0s do not have a mass flow air sensor does it?
Nope, it has a MAP sensor: http://www.jeepforum.com/forum/f9/ma...ensor-1063614/
...
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Unread 09-23-2013, 05:05 PM   #228
Ajcobosco
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Thanks ill be trying to do this tomorrow now.
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Unread 09-23-2013, 05:33 PM   #229
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You're welcome and post back as to how it goes...
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Unread 09-23-2013, 05:45 PM   #230
Ajcobosco
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Quote:
Originally Posted by Knuckelhead
You're welcome and post back as to how it goes...
I'll take pictures as I go threw it as well.
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Unread 09-24-2013, 03:37 PM   #231
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I'm still waiting for the call that my gasket came in. They said it would only take a couple of hours to get.
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Unread 09-28-2013, 02:47 PM   #232
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Well I finally got the time. I didn't notice a huge difference in the idle but it wasn't to bad either.


Before

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After



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image-4155915176.jpg
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Unread 10-02-2013, 11:41 AM   #233
Ajcobosco
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Well I did get 24.64 mpg when I drove in the mountains and back. 240 some miles that day
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Unread 10-14-2013, 11:35 AM   #234
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The next one I got 17.8 for city driving
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Unread 12-09-2013, 12:03 PM   #235
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Good evening all. I've been having light throttle jerkiness on my 98 manual 4.0 TJ (170,000 km), no problem with full throttle.

This jerking was driving me nuts. Noticed slight crack in dizzy cap, so changed that + rotor arm, HT leads, plugs, coil.
Still the problem remained..

I went to the dealer (not to get my pockets picked LOL..) to see if they could check the diagnostics as had been having intermittent 'check engine' light. No codes. Mechanic says maybe the IACV needs replacing but no stock & not really sure without fault codes.., so start with changing that & if no better do the same with the TPS. (pocket emptying dealer mode..).
Didn't change anything, just parked it up as only use it in the desert once or twice a month. Next drive (a week later), no jerkiness, problem 'solved', but as I didn't know what had been wrong before.., was concerned if it happened again how to diagnose..

Now that moment has come again..., I've read all of this excellent thread & plan to attack the TB, TPS, IACV etc with TB cleaner as it seems the problem is rooted there..

I also wondered if a dirty injector or two had somehow 'coughed' & cleared their throats, but this thread seems to point to the TB & associated sensors..

I removed the TB the other day but hadn't read this thread at that point & the inside of the TB didn't seem dirty. However I did note the inside of the intake manifold below the TB was heavily carboned..., what is best to clean that & should it make much difference?

When cleaning the TB, does it help to use any metal polish on the TB throat after/before using TB cleaner?

Is everyone using WD40 or similar on the sensor electrical connections?

Any other advice appreciated as driving on soft sand with a needed light right foot at times is damn tricky with jerky power delivery!!

Thanks in advance! :-)

Last edited by djtjdxb1998; 12-09-2013 at 12:23 PM..
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Unread 12-12-2013, 02:18 AM   #236
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Update.

I have changed the TB with a used one & all now is good! Havn't found any TB cleaner so that seemed worth trying!
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Unread 04-01-2014, 02:35 PM   #237
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hey everyone. Im trying to clean my tb and having issues getting the sensors to pull off. Is there a trick to do it. Im pushing the connector in with my finger and there not pulling off.
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Unread 04-01-2014, 02:38 PM   #238
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Quote:
Originally Posted by dmb2002man View Post
hey everyone. Im trying to clean my tb and having issues getting the sensors to pull off. Is there a trick to do it. Im pushing the connector in with my finger and there not pulling off.
Push the plug in slightly then pres the clip and pull...

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Unread 04-01-2014, 02:58 PM   #239
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This is the one im talking about.
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Unread 04-02-2014, 02:21 PM   #240
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On my 2006 tj 4.0, can I just unscrew the 1 screw on the map sensor and then remove the rubber hose? I also see throttle position sensor has 2 screws which is on the back side facing the firewall on the tb. Can i also just remove those screws and pop it off. thanks
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