DISA - Intake Manifold Actuator question - E46Fanatics E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

Thread Tools Search this Thread Rate Thread Display Modes
Old 09-07-2013, 04:14 PM   #1
Registered User
Join Date: Jun 2011
Location: Burt, Michigan
Posts: 22
My Ride: 2001 330ci
DISA - Intake Manifold Actuator question

Sort of a newbie and enjoying the forum so I figured someone with some more knowledge could aid in my thought process. I replaced my CVV this past winter and in the process of replacing all of the rubber on the intake manifold and replacing as many gaskets as I could along the way, I definately believe that my DISA/ Intake Manifold Actuator may have been/ needs to be replaced. I remember playing with it and noticing that when it was rotated that it made a popping noise which I think I can vaugly hear when my car is idling after going for a trip (once it is at operating temp for a while) leading me to think that it may be gettnig worse. I have not had any noticable performance changes, at low idle it doesn't have any problems like I believe I have read would be present, just interested in getting some opinions on what someone more knowledgeable thinks about the car and the sound. Currently has 165,000 and I feel its well maintained. I am a college student who would like to not spend an arm and a leg on parts if they are not necessary but I want it to be maintained so if someone feels its necessary I wouldn't hesitate to purchase one. Thanks again
stgoulet is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 09-07-2013, 04:41 PM   #2
Zero. Leaks.
Solidjake's Avatar
Join Date: May 2008
Location: NYC
Posts: 31,106
My Ride: '02 330i 6MT
Best thing to check if it has failed is to listen to the disa with it plugged in and the engine on. Then turn off the engine, unplug the disa connector, start the car and see if there is a difference. If you notice a loud rattling sound gone then it must be replaced.
Solidjake is offline   Reply With Quote
Old 09-07-2013, 05:03 PM   #3
Registered User
Join Date: Mar 2013
Location: Southend, UK
Posts: 3
My Ride: E46 325I Touring
As I recall, my disa (manifold adjuster) made the same popping sound when moving the flap, which is normal. This valve has a somewhat strange mode of operation, it is an electrically triggered vacuum operated device that is closes when then engine revs are below around 4000rpm and opens above 4000rpm.

There are threads on the forum that will assist in testing it.... basically close the flap and cover the small hole tightly with your thumb then let the flap go, if it rotates back with no resistance, the diaphragm is knackered. Be aware though there is more than one mode of failure for this device. edit: If the flap is loose or has fallen off then there are refurb kits available, but beware of anything coming loose in your intake!

I had lean codes and this valve wouldn't close when I had intake leaks, I replaced the intake boots as there was a tear (still had lean codes) then the ccv and all associated pipes due to puffs of white smoke, excessive oil consumption and an disturbing squeal/whistle when the engine was hot.

It now closes and operates as it should.

In my case at least the lack of vacuum seems to be the reason the valve didnt close, once the intake was airtight the disa operated normally.

Last edited by judge_jamin; 09-07-2013 at 05:06 PM.
judge_jamin is offline   Reply With Quote
Old 09-09-2013, 05:20 PM   #4
Registered User
Join Date: Jun 2011
Location: Burt, Michigan
Posts: 22
My Ride: 2001 330ci
Thanks for the replies: I have had lean codes and other O2 codes and have replaced all the rubber on the intake as of last winter/into spring but still occasionally have codes thrown (I will look them up today when I get out of school). I have disassembled it twice and I don't hear any "sucking" leaks around the intake but I do hear that popping occasionally. I do apologize my knowledge isn't quite up there, but I'm learning. I took a picture of the valve this summer so I will get that up when I figure out how very soon to try and get your opinion on its condition, just remembered that I did that.
stgoulet is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Censor is OFF

All times are GMT -5. The time now is 08:07 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - VerticalScope Inc. All rights reserved.