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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 01-16-2012, 06:51 PM   #1
geoffriehl
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info on the DISA valve, READ!!!!

ok guys, I finally have something to contribute! After chasing misfire and lean codes, and installing an air pump I did not need, I finally located and fixed my issue. If you get lean codes, misfires, at cold start up a little of a choppy idle but THAT bad, maybe a slight lack of acceleration, but not that bad...plugs and coils are good...check the DISA valve gasket! (sorry, dont have pics)

easy to remove, anyone reading this can figure it out...once it is out, and you can see flat spots...scrape the old orange gasket out....clean it real well, go to Advance, and buy a $2.00 Fel Pro gasket PN 35489 for a 1991 to 1994 Ford Probe...it fits like a glove! Seat the gasket in there, coat it in oil, set the valve and alternate tightening the bolts up, it fits PERFECT and AIR TIGHT!

Fixed me right up! and thanks to the guys on here for the suggestion to check that

Any questions, hit me up

Geoff
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Old 01-16-2012, 08:15 PM   #2
325xittt
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Nice find on the gasket. love to save some coin
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Old 01-16-2012, 08:54 PM   #3
E RaK
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Is there any way you can post a mini-diy?
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Old 01-16-2012, 09:17 PM   #4
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I have been chasing a very similar issue for a couple years now. Cold startup, misfire on cylinder #1, not the coil (swapped them around). I can avoid the issue if I hold the rpm's to 1100 for a minute or two. If I don't do this, the SES comes on and the engine goes to limp mode. I tried building up the DISA gasket with electrical tape. My valve seems to be working fine, spring seems intact, valve snaps back OK. I saw another thread where this issue was fixed for some by replacing the fuel filter, but this did not help on my car. I also read where someone poured SeaFoam into the tube from the air pump. Tried this too with no affect. I am going to try this gasket out, boy I hope it works! Seems like there are several causes for this issue. Thanks for providing something new and cheap to try. I don't understand why BMW doesn't make a replacement gasket for the DISA. They seem to do everything else so well.
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Old 01-16-2012, 09:26 PM   #5
Silver325
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Quote:
Originally Posted by E RaK View Post
Is there any way you can post a mini-diy?
There are only two screws that hold in the DISA. This link shows the
DISA removed;
http://forum.e46fanatics.com/showthr...t=disa+removal
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Old 01-16-2012, 09:39 PM   #6
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Good find!
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Old 01-16-2012, 09:50 PM   #7
Razkal
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I replaced my DISA a week ago and it took about 20 minutes, made a difference with idling and my fuel consumption is better now as well.
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Old 01-17-2012, 06:55 AM   #8
geoffriehl
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yea, I drove her in this morning...the acceleration is smoother with much more power. I drove 600 miles over the weekend with an avg of 25.5 mpg, Maybe my gasket being wacky casued that....well, also my air filfter was junk....swapped that out also yesterday....Glad I was able to help! just make sure you get all the old gasket out...and make sure and lube the new one after you get it on the valve --- while it is out, inspect the upper and lower boots real well, even if they are not cracked, it may not be a bad idea to replace them while you are there. I reinstalled my upper (it was ok) but I may be putting a new one on soon, considering they are not expensive.
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Old 01-17-2012, 08:02 AM   #9
druggrepp
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I had done the disa valve check, all ok.
Put all new intake boots on. Perfect for 6 months, then stumbling off red lites{5 spd}. I retightened all the intake boot clamps. and 99% better.
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Old 01-17-2012, 08:44 AM   #10
geoffriehl
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Originally Posted by druggrepp View Post
I had done the disa valve check, all ok.
Put all new intake boots on. Perfect for 6 months, then stumbling off red lites{5 spd}. I retightened all the intake boot clamps. and 99% better.
do you have any codes?
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Old 01-20-2012, 02:16 PM   #11
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Hey OP did you have any issues with the rpms surging between 1-2 k when coming to a stop before you changed the gasket?
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Old 01-20-2012, 02:17 PM   #12
geoffriehl
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no, i never had a surge....but i guess it could cause that
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Old 01-20-2012, 09:22 PM   #13
wildcat293
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how the hell did you figure out this gasket fits?

amazing find
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Old 01-21-2012, 09:00 AM   #14
geoffriehl
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well, ill give you the reader's digest version....it was suggested that I check the valve, and if the gasket was flattened out to replace it and that BMW does not offer a gasket but you can buy one on ebay. So, I ebay searched it and saw what the person was selling, looked at the valves, saw that I would have to scrape the old gasket out, got it out all clean and sat at my desk thinking about it and i thought there has got to an oring I can find to fit. Im the srv mgr for volvo in savannah, I searched my parts dept and an oil filter oring was close but too big, so I walked over to the advance auto across the parking lot and i know all the guys there, so they just let me dig through a box of random o-rings...and i opened a few up and settled on trying a few...and that one just seemed to fit!! thats about it! Glad I was able to help
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Old 01-21-2012, 12:43 PM   #15
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O-ring installed

I installed this o-ring today. The most time consuming part of this DIY is just getting the old gasket material removed and cleaning up the plastic groove (careful not to scratch it up!). As you can see in the photo below it fits very well. I should note that it is a bit thick in diameter, so even after lubing it up with a coat of oil I had to use the mounting screws to fully pull the DISA into the intake plenum. However, I think it made a really nice seal.

It was about 12 degrees F outside when I did this repair. Upon startup, I did not get any misfire codes or go into limp mode! I am going to reserve judgement on whether this really did fix my cold startup issue though. I'll need to try several more cold startups to be sure, and report back later how this goes on the long term. I am hopeful

[IMG]Photobucket[/IMG]
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Old 01-21-2012, 02:18 PM   #16
geoffriehl
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yea, thats exactly what I found, at first I was afraid it was going to roll out when I put it in, but when I started the bolts back in went in the intake, and then I alternated tightening them up and by the time I was done, it looked good to me! Man, if that fixes your issue --- !!!! that would make ME happy!!!! :-0

please let me know!
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Old 01-23-2012, 07:03 AM   #17
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Guys, I am just chasing a ghost of bad mpgs recently. Car drives fine, idles fine, no rattles, no loss of power, no codes nothing, just recently mpg dropped by 50 miles a tank.
I am willing to check DISA and clean ICV, intake boots.
Will a bad DISA cause bad mpg?
Are we talking about this item in this thread?
http://www.ebay.com/itm/BMW-E46-330-...#ht_530wt_1217

I hate waiting for shipping, if its a same part then I will just get it from pep boys.

Also is it advised to change this O ring without having any symptoms of failed gasket? I mean as a preventative maintenance.
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Old 01-23-2012, 07:32 AM   #18
geoffriehl
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well, I am not sure about the mpg issue, (I have read threads on here suggesting it could) but if your intake boots were bad, I am faitly certain you would have a loss of power, a ck eng light...etc...

the ebay item: that is why I went to find something else -- I hate waiting also, and I also hate paying $15 for an o-ring!!! It fits great (maybe better than that one!) and costs $2 to $3! Im thinking about buying 50 of the one I found and then eBay them for $10!!!! (kidding!!!!)

good luck!
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Old 01-23-2012, 12:28 PM   #19
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Quote:
Originally Posted by geoffriehl View Post
well, I am not sure about the mpg issue, (I have read threads on here suggesting it could) but if your intake boots were bad, I am faitly certain you would have a loss of power, a ck eng light...etc...

the ebay item: that is why I went to find something else -- I hate waiting also, and I also hate paying $15 for an o-ring!!! It fits great (maybe better than that one!) and costs $2 to $3! Im thinking about buying 50 of the one I found and then eBay them for $10!!!! (kidding!!!!)

good luck!
lol, yah you should ebay them. I am just joking though.
Thats a wonderful find. I will stop by the advanced auto and get it today.
There is a buy one get one free on techron chevron in auto zone, I will grab a couple of those too.

I am not getting any SES/MIL lights nor any cold start problems or noticed any loss in power. Just the mpg dropped significantly, hence trying to do cheaper things first and see if it helps.

It won't do any harm if I take out the DISA and just replace the O-ring although the old one is tight, am I right? I just don't want to break anything, because I tend to break things when I am under the hood
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Old 01-23-2012, 12:41 PM   #20
geoffriehl
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No, it will not do any harm.....might as well try it!
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