How To: Clean Your ICV-(Air Stabilizer Valve)

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  • e30pwr
    Mod Crazy
    • Oct 2007
    • 642

    #1

    How To: Clean Your ICV-(Air Stabilizer Valve)

    I had some sketchy idle problems the other day, after a can of seafoam I threw in the towel and decided on cleaning out the ICV, or as the Bentley bible calls it the "Air Stabilizer Valve". So Off to Autozone I went, Here's what you will need/What I used:

    • Carb Cleaner
    • Engine Degreaser
    • Flashlight(depending on where your working)
    • Wire Cutters
    • An appropriately sized hose clamp
    • Q-Tips
    • #10 wrench for getting the ICV mount off
    • 5/16" sized wrench to clamp the hose clamp


    ***All pics below text for easier reading of DIY***

    First things first, I went into the project with Bentley in hand. Here's the thing your going to be removing and cleaning. The Bentley didn't go into much detail so I figured why not make a DIY while I'm at it.

    First thing your going to want to take off is the electrical connection. It's sorta hidden but not hard to find, pull up on the two tabs and then pull the connector off.

    Now you will see the two hose clamps that will need to be taken off. I found it easier to take off the piece that mounts the ICV to the engine to help be able to move the ICV easier to get out of the hoses. The far clamp came off no effort and the factory crimp clamp was a bitch, so thats where the Wire cutters come in, just hack the thing off.

    After realizing I didn't have the right size hose clamp I jumped in the Turbo and off to Autozone again I went. The digital calipers read about 1.4" for the hose diameter so try to find a clamp that is 1.5".

    Originally posted by BergerNJ
    those factory clamps are actually a standard for use in irrigation work and can be used any funny pipe/rubber hose.


    when I do repair work on any hoses or pipes when working irrigation, the EASIEST way to get those clamps off is to grab where you can see where it was crimped inwards and twist. It should snap easily, and if it doesn't give it one or two more twists....Cutting them is actually harder.

    Depending on the icv, if it has a metal shroud/inlet then your safe in doing this. If its plastic, I am unsure, I would recommend cutting and not possibly over tightening the clamp to the point you crack or break the icv



    using them when twisting off makes it super easy
    After getting back and making sure the hose clamp fits you now can get on to the cleaning. You will notice there is an intake from the intake boot and the exhaust part of the valve that points parallel to the engine when mounted. I took my spray and carefully and slowly allowed the cleaner to barely squirt out of the included spray nozzle and let it just drop out of the bottom hole*See picture for this to make complete sense*

    Now put some engine degreaser on a rag and rub the outside of the ICV to make it all nice and half-shiny looking. Why not clean the outside too?

    Let it dry for about an hour (Take a nap, oder some pizza and a drink of your choice, the hardest part is over) before installing back on the intake. I let my car sit for another 6 hours before I started it back up and drove it around the block. Installation is the reverse of disassembly.
















    Below is my parts getter when the e30 is down. S60 Turbo FTW.








    The hardest part is done! Now to wait and eat.......

    Last edited by e30pwr; 05-21-2011, 03:31 PM.
  • Nicademus
    R3VLimited
    • Aug 2008
    • 2912

    #2
    Thanks for making this DIY. Really useful. How did it work out for you? Make things better? Your ICV looked pretty grimy inside.

    Well, posterity, you will never know what it cost us to preserve your freedom. I only hope that you will make a good use of it. If you do not, I shall repent in heaven that I ever took half the pains to preserve it.
    ~ John Adams ~

    Comment

    • dkerley03
      Advanced Member
      • Sep 2008
      • 186

      #3
      It helped a Lot!

      I cleaned mine on my 1988 325IS, it was in a little different location and different mount. But, same cleaning procedure. It really settled my idle down to a steady 700+/- RPM.

      Try, you can't loose!

      Comment

      • Nicademus
        R3VLimited
        • Aug 2008
        • 2912

        #4
        I'm waiting for mine to dry out fully as I type. Hopefully I didn't ruin it because I kinda douched the thing out pretty hard.

        Well, posterity, you will never know what it cost us to preserve your freedom. I only hope that you will make a good use of it. If you do not, I shall repent in heaven that I ever took half the pains to preserve it.
        ~ John Adams ~

        Comment

        • kamotors
          R3V OG
          • Nov 2007
          • 7102

          #5
          i cleaned mine, and the car seemed to idle much soother


          7speedshop.com

          Comment

          • Adrian_Visser
            R3VLimited
            • Jun 2006
            • 2823

            #6
            personally i have never had any luck cleaning icv's. I tried it on my e28 with no luck and same on my eta. there used to be a diy on unofficialbmw.com about cleaning them looks like the link doesn't work anymore though. the author mentioned that according to bmw carb cleaner can damage the icv and that you aren't supposed to clean them. i've never seen a difference either way though.

            '89 Alpine S52 with goodies

            Comment

            • dkerley03
              Advanced Member
              • Sep 2008
              • 186

              #7
              Originally posted by Adrian_Visser
              there used to be a diy on unofficialbmw.com about cleaning them looks like the link doesn't work anymore though. the author mentioned that according to bmw carb cleaner can damage the icv and that you aren't supposed to clean them. i've never seen a difference either way though.
              I do not know if carb cleaner will damage a ICV or not it, before I spend $140 for a new one on my 325ISm, I cleaned it! If it damages it and I buy a new one, I have lost nothing. If it cleans and fixes my idle, I have saved $140!
              So far mine is working fine after cleaning. :D

              Comment

              • M3 Ryan
                Site Sponsor
                • Oct 2003
                • 2298

                #8
                BMW tells you not to clean them with carb cleaner because it WILL fix them, and then they can't sell you a new one! I clean them all the time, never had an issue with it. Just make sure NOT to lube it when you are done (no spraying WD-40 or anything in there...) as it needs some resistance in the flapper.
                '88 M3.2 S54 Lachssilber/Black
                '07 335i Alpine/Black Sedan
                '12 X5 3.5i Alpine/Black
                iS Splitters For Sale, PM ME!
                sigpic

                Comment

                • Atreus
                  E30 Mastermind
                  • Sep 2008
                  • 1846

                  #9
                  Originally posted by Nicademus
                  I'm waiting for mine to dry out fully as I type. Hopefully I didn't ruin it because I kinda douched the thing out pretty hard.
                  so how did yours come out? i was going to do mine, but its all dark and cold now. tomorrow morning......
                  1991 325iC - Mauritsblau sumthin metallic blue. DEAD
                  1992 525i - Silber sumthin sumthin metallic- Rolling again, needs suspension/wheels/brakes/paint.... Fuck you A4S310R; BEAT YOU.
                  1989 325i - Cirrusblau Metallic sumthin sumthin-project - trying to clean up the interior(done), then the body, then a 5spd, then suspension, then..... - [Stolen :| ]
                  1991 325iC - Calypsorot Metallic
                  1994 540i - Granitsilber

                  Originally posted by scabzzzz
                  I've had blunts cock in my mouth, but I'm not gay.

                  Comment

                  • Nicademus
                    R3VLimited
                    • Aug 2008
                    • 2912

                    #10
                    Originally posted by Atreus
                    so how did yours come out? i was going to do mine, but its all dark and cold now. tomorrow morning......
                    Car runs still. Mine wasn't that dirty, I could tell it had been replaced previously. I'd go for it.

                    Well, posterity, you will never know what it cost us to preserve your freedom. I only hope that you will make a good use of it. If you do not, I shall repent in heaven that I ever took half the pains to preserve it.
                    ~ John Adams ~

                    Comment

                    • SpecM
                      R3V Elite
                      • Oct 2005
                      • 4531

                      #11
                      cleaning out the trottle body in much the same manner will help smoothness/power under load (not idleing)
                      1989 cirrisblau-metallic 325i

                      Comment

                      • Nicademus
                        R3VLimited
                        • Aug 2008
                        • 2912

                        #12
                        Originally posted by SpecM
                        cleaning out the trottle body in much the same manner will help smoothness/power under load (not idleing)
                        That's what I need. Is there a DIY on it?

                        Well, posterity, you will never know what it cost us to preserve your freedom. I only hope that you will make a good use of it. If you do not, I shall repent in heaven that I ever took half the pains to preserve it.
                        ~ John Adams ~

                        Comment

                        • SpecM
                          R3V Elite
                          • Oct 2005
                          • 4531

                          #13
                          Originally posted by Nicademus
                          That's what I need. Is there a DIY on it?
                          get some TB cleaner and an old toothbrush... take off the air boot... get to work!
                          1989 cirrisblau-metallic 325i

                          Comment

                          • dashboardmonkey
                            FUCK YOUR WAFFLES
                            • Jun 2008
                            • 6158

                            #14
                            I like the size of the hose clamp wrote on your hand.

                            Made me lol

                            Andy
                            -Andy

                            Comment

                            • Nicademus
                              R3VLimited
                              • Aug 2008
                              • 2912

                              #15
                              Originally posted by SpecM
                              get some TB cleaner and an old toothbrush... take off the air boot... get to work!
                              Thanks for the DIY, I say it should be a sticky ;)

                              Well, posterity, you will never know what it cost us to preserve your freedom. I only hope that you will make a good use of it. If you do not, I shall repent in heaven that I ever took half the pains to preserve it.
                              ~ John Adams ~

                              Comment

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