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Unread 07-05-2013, 08:59 PM   #1
steve_80
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Rough idle, cleaned IAC, now worse :(

Tonight I took out my IAC on my 2000 WJ v8 because I've been having rough idling and driving hesitation.

I cleaned it with tb cleaner (sensor safe) and a toothbrush and let it dry. I made sure no spray went into the iac motor. Let it dry then installed it.

I started up no problem and it was quiet, then I drove around the block and the idle kept bouncing from 200-600 rpm likes bouncing ball. It's worse than before I cleaned it.

It was covered in gunk when I cleaned it. So I thought it would run smoothly. I'm out of ideas.

Anyone know why it's now running worse?

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Unread 07-05-2013, 11:02 PM   #2
steve_80
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I just took the tb off and cleaned it completely. It's spotless.

Can't test it until tomorrow. Kids sleeping. Damn v8!

If this doesn't work, any suggestions?
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Unread 07-05-2013, 11:56 PM   #3
Jrboarder27
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It might be worth it to change out your fuel filter/ pressure regulator. I've heard they can cause rough idle, but not sure about RPM issues.
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Unread 07-06-2013, 05:18 AM   #4
99SK04GTX
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Tps?
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Unread 07-06-2013, 07:58 AM   #5
rcwj04
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Check your tps, but maybe you possibly put it back in upside down?
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2004 WJ Laredo 4.0 116k
2" BDS coils & Bilstein 5100's | Addco rear swaybar with energy bushings |
K&N FIPK | glasspack | plasti-dipped badges | 17" moabs | HID's, 245/65/17 Cooper Discover AT3 | Rola rack | Fawkes stand alone shackle tabs | Bed lined interior (what a pain that was)
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Unread 07-06-2013, 09:37 AM   #6
steve_80
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i didnt remove the TPS, i followed the cleaning instructions at wjjeeps and it never mentioned to take it off.

should i take it off and clean that too?
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Unread 07-06-2013, 09:42 AM   #7
99WJ539918
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Unhook your battery for twenty minutes and let the computer erase the run data. Let me know how it runs after that. Good luck.
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Unread 07-06-2013, 09:56 AM   #8
steve_80
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both terminals?
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Unread 07-06-2013, 10:33 AM   #9
rcwj04
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Just the negative is all you need
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Quote:
You forget that most members here don't own a crystal ball to tell you exactly what your problem is, specially with bad pictures that don't say/show much of anything... -Jacko84

Just a 19 year old kid with a Jeep, and broke because of it, and loving every moment.
---------------------------------------------------------------
2004 WJ Laredo 4.0 116k
2" BDS coils & Bilstein 5100's | Addco rear swaybar with energy bushings |
K&N FIPK | glasspack | plasti-dipped badges | 17" moabs | HID's, 245/65/17 Cooper Discover AT3 | Rola rack | Fawkes stand alone shackle tabs | Bed lined interior (what a pain that was)
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Unread 07-06-2013, 02:54 PM   #10
steve_80
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ok i did that, and drove it for 40minutes, started great and idle is smooth.

ill give it a week to see if it stays smooth. the last time i sprayed TB cleaner in it was smooth like this, but the problem came back after a week or so. But this time i took it off and cleaned the IAC as well.
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Unread 07-06-2013, 09:43 PM   #11
narnwv
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just a note...

you can't clean the TPS. It's a sealed electrical device.
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Unread 07-06-2013, 11:29 PM   #12
steve_80
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ah ok, then i wont bother taking it off, thanks for the heads up
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Unread 07-07-2013, 03:23 AM   #13
KFLECK
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keep me posted on how this is going for you. I seem to have the same problem myself
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Unread 07-07-2013, 08:09 AM   #14
99WJ539918
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Quote:
Originally Posted by steve_80 View Post
ah ok, then i wont bother taking it off, thanks for the heads up
He's right, but you can unplug it and check for corrosion in the plug, and if there is any you can clean that. Keep us updated, there are a lot of bad idling threads being posted these days.
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Unread 07-08-2013, 10:13 AM   #15
doorjamm
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It was just that the computer was so used to the skewed readings that it managed everything off of that with a large compensation and that compensation became normal. Then you cleaned it and it got way different readings which really confused it and caused the rough idling. My jeep did the same thing when I finally decided to fix my o2 sensor relay. I never restarted the computer, but I just drove it for 5 minutes until the roughness went away
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