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DIY: Do It Yourself
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Old 07-03-2013, 06:37 AM   #1
ocellatus
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Join Date: Apr 2013
Location: Tehran, Iran
Posts: 34
My Ride: 325i 2005
Help! Rev wiggles after ICV cleaning :(

Hi there,

My e46 ( 2005 325i on 60k Miles ) did not have a noticeable problem but I did a cleaning job on Idle Control Valve (ICV) and Throttle Body (TB) recently. In the way through, I also cleaned the MAF sensor with a contact cleaner spray and also used some ICV/TB cleaner on the DISA valve to clean up the dirt.
After reassembling everything I reset those adaptation parameters with a coding device.

Since then, this happens sometimes when the throttle is released the rev does not lower smoothly. Instead, it lowers while it has a small, rapid but ordered bouncing move.

A mechanic told me that's because you did not lubricate the ICV. And he was right! I only used those TB/ICV/etc cleaner sprays and he said it has dried out the ICV valve causing step moves instead of smooth lowering. I felt so stupid! but was happy for finding the reason, we went through the ICV removal process again and got it lubricated. This time I could easily hear the knock sound of the valve when I was shaking it in my hand, meaning its good to go. But yet there is no sign of improvement. Rev still wiggles sometimes when the throttle is released.
This happens like 5 times in a 30 minutes city driving with a lot of throttle releases.

Here is a video of the symptom I explained :
http://s4.picofile.com/file/78173332...cated.avi.html

Downhill made a constant speed and rev there but usually this happens while the rev is lowering with throttle released.

I would appreciate your comments on this issue.

Last edited by ocellatus; 07-04-2013 at 09:24 AM.
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Old 07-06-2013, 12:39 AM   #2
ocellatus
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Join Date: Apr 2013
Location: Tehran, Iran
Posts: 34
My Ride: 325i 2005
Help!

Any ideas?
Anyone ever encountered such problem?
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Old 07-06-2013, 11:05 AM   #3
markusmarkus
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Location: USA
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My Ride: 2001 330Ci
Help! Rev wiggles after ICV cleaning :(

Did you replace the TB gasket?


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Old 07-06-2013, 12:43 PM   #4
ocellatus
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Join Date: Apr 2013
Location: Tehran, Iran
Posts: 34
My Ride: 325i 2005
No I did not replace anything, markus. All gaskets and boots seemed very healthy.

So, could this be related to TB gasket?
We removed TB and I cleaned its both sides with a lot of that TB cleaner spray. Maybe some has spilled on the gasket, I don't know if it has bad effects.
Should I have lubricated the TB valve as well?

Here are attached 2 pics of TB gates and gasket taken after I cleaned it. I only used a cheap TB cleaning spray.
Attached Thumbnails
Click image for larger version

Name:	E46_ICV_TB_cleaning_16.jpg
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ID:	514940   Click image for larger version

Name:	E46_ICV_TB_cleaning_17.jpg
Views:	61
Size:	64.9 KB
ID:	514941  

Last edited by ocellatus; 07-06-2013 at 12:44 PM.
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Old 07-09-2013, 07:10 AM   #5
ocellatus
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Join Date: Apr 2013
Location: Tehran, Iran
Posts: 34
My Ride: 325i 2005

When this is happening, usually if I give the throttle a small tap it will be fixed. Same if I wait or brake until the rev reaches the minimum.
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Last edited by ocellatus; 07-09-2013 at 07:25 AM.
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Old 07-09-2013, 08:11 AM   #6
junklar
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Location: Queens
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My Ride: 2002 325ci
I think its your disa valve.. Search it on here
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