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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 02-12-2014, 11:33 PM   #1
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Join Date: Aug 2013
Location: San Francisco
Posts: 43
My Ride: 2001 e46ci
Cleaning IACV via Throttle Body?

UPDATE!! 2/23/14

Hello Again!
So I cleaned my IACV, I took it out, after a long war with the lower boot's jubilee clip being faced down (the person who designed it like that should die in a fire).

My idle was perfect!...for 12ish hours, my check engine light when off and everything was smooth! AND THEN for some reason it started to get rough again, when i pulled up to a stop sign and put it into neutral (holding my clutch down) my car rpm would go to zero; I would stall. This happened for about 30mins until i go home and for the past hour or so it hasn't happened again.

I haven't gotten a hold of a code machine so i don't have codes yet, however my check engine turned back off after the rough idle went away. I was thinking about taking it out again and spraying it some more! Any ideas on why im getting a rough idle/stalling in neutral?

for those who are interested in removing their IACV, here are the links i used to remove mine:



Hello e46fanatics!

2001 3.25ci 5spd

So i have a really rough idle, it jumps up in down .5-1.5 rpm every once in awhile. Also once in a while i'd stall when i go into neutral (stopsigns, lights) and i looked up that one of the problems could be the IACV, I found a DIY to take it out, but i'd like try a alternative method before taking apart that area...

I was told by a friend that i could spray some carb cleaner into the throttle body, which would take the cleaner into the IACV and clean it a bit.
Has anyone done that before? i'm not the most mechsavy guy, so i was wondering before i start spraying stuff into my car i could get some other opinions?


Last edited by Callmetofo; 02-23-2014 at 03:55 AM. Reason: updated problem!
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Old 02-13-2014, 12:14 AM   #2
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Join Date: Jun 2012
Location: Calgary Alberta Canada
Posts: 733
My Ride: 2005 330ci zhp
Uhh we'll I sprayed some carb cleaner on the carb of one of my shitty dirt bikes while it was running and it sputters a bit but idles again normally. Cleaned it out a bit but that was also directly onto the carb. I can't imagine it would do any damage to anything, but you would be better off to just take the throttle body off and give it a proper cleaning with a rag. That way you will actually get all of grime off as some of it is pretty caked on there.

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Old 02-23-2014, 03:58 PM   #3
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Location: San Francisco
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My Ride: 2001 e46ci

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erratic idle, iacv, icv, idle air control valve

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