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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 06-02-2009, 09:52 PM
ventsyv ventsyv is offline
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DIY: Repair DISA rattle

If your engine sounds like a diesel your DISA might be the problem. The DISA is a valve that regulates the amount of air that goes in the intake manifold.
To diagnose the problem, simply check if the rattle is gone when the DISA is disconnected. First, open the hood and listen to the engine running. Now turn off the car, disconnect the DISA and start the car again. If the rattle is gone, you know the DISA is causing it.
http://s12.photobucket.com/albums/a2...t=MOV02505.flv

People have suggested taking the DISA off completely and closing the hole with metal plank. Others suggest cutting off the flapping part of the DISA so that it never closes. The third option is to either replace the DISA or try to clean it.

Parts: CRC Throttle Body Cleaner - about $10

Procedure: Take the DISA off.

Once you have it out, take out the little plastic cap. You see the moving mechanism for the rod. Spray Throttle body and clean it. See picture bellow.




Move the flap to fully closed position. Using the little straw that came with the cleaner, spray throttle body cleaner inside the the hole the rod goes into. (circle on picture) Keep moving the flap so that the cleaner can reach everywhere.
Spray and clean the flap area. (Arrow on picture)




Also spray in the little air hole. Be careful not to get cleaner in your eyes because moving the flap will expel it of the air hole.



Reinstall the DISA and the rattle should be gone.

Many thanks to Solidjake, Myfirst330Ci, Brian McKinney and all other bimmerfest members.
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  #2  
Old 06-03-2009, 06:10 AM
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phlfly phlfly is offline
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Hey guys how is easy to remove DISA. I have read procedure, but is it easy to access there? how many hours?
Thanks
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  #3  
Old 06-03-2009, 07:36 AM
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Solidjake Solidjake is offline
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Quote:
Originally Posted by phlfly View Post
Hey guys how is easy to remove DISA. I have read procedure, but is it easy to access there? how many hours?
Thanks
Try 15 minutes, lol. Remove the intake by taking out the 2 bolts and the 3 pop rivets, remove the MAF section, get a ratchet with an extension and a T40 (I think) head and just take out the 2 bolts. Slip it out and put it back in.



OP, thank you for this write up.
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  #4  
Old 06-03-2009, 09:26 AM
ventsyv ventsyv is offline
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If you have T40 driver, it will take you 15 - 30 min. I took the air filter box out by removing the two screws, no need to take the plastic piece near the fan, just slide it out. You have to disconnect the sensors and undo the screw that secures the MAF sensor to the lower intake elbow first obviously. Then there are two screws that hold the intake elbow to the lower intake "hose".
Finally you have the two T40 screws. Just make sure you have T40 (star) driver. I tried using hex key for 45 min, then put everything back together, went to the store and bought a set of star keys. Using the T40 key I got the screws down in 2 minutes.

So to summarize:

2 screws - 8mm I think
3 flaw head screws
2 T40 screws
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  #5  
Old 11-30-2010, 08:55 AM
Nervous Nervous is offline
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Hey guys,

Thanks for DIY!
Quick question: the flap on my DISA moves freely for about 180 degrees. No resistance from stop to stop (from 0 to 180 deg). Is it how it should be?
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  #6  
Old 11-30-2010, 09:02 AM
marlin1881 marlin1881 is offline
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Originally Posted by Nervous View Post
Hey guys,

Thanks for DIY!
Quick question: the flap on my DISA moves freely for about 180 degrees. No resistance from stop to stop (from 0 to 180 deg). Is it how it should be?
Nope. There should be spring-loaded resistance to fully close the flap, in one direction. If not, I'd replace the DISA assembly itself.
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  #7  
Old 11-30-2010, 09:26 AM
jcourcoul jcourcoul is offline
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I take it that since you have to remove the rubber air intake boots to get to the DISA and if they're old, cooked and brittle, there is a good chance of damage in the process, right? So it may be a good idea to have a replacement set on hand before starting, right?

Also, would a bad DISA or ICV cause failure to start?
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  #8  
Old 11-30-2010, 11:44 PM
mujjuman mujjuman is offline
tappa tappa toit
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Quote:
Originally Posted by jcourcoul View Post
I take it that since you have to remove the rubber air intake boots to get to the DISA and if they're old, cooked and brittle, there is a good chance of damage in the process, right? So it may be a good idea to have a replacement set on hand before starting, right?
my guess is yes

Quote:

Also, would a bad DISA or ICV cause failure to start?
my guess, no... unless there is a huge vacuum leak where the disa goes. but a vac leak doesnt seem to be your prob.... seems more like fuel pump related
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  #9  
Old 12-01-2010, 06:56 AM
Nervous Nervous is offline
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Quote:
Originally Posted by marlin1881 View Post
Nope. There should be spring-loaded resistance to fully close the flap, in one direction. If not, I'd replace the DISA assembly itself.
Thank you, I see now: the flap is completely detached from the rod, there should be something that attaches one to another in the middle of the flap. And this part is missing on my DISA.... Oh, well, another $150.....
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  #10  
Old 12-01-2010, 07:26 AM
marlin1881 marlin1881 is offline
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Quote:
Originally Posted by Nervous View Post
Thank you, I see now: the flap is completely detached from the rod, there should be something that attaches one to another in the middle of the flap. And this part is missing on my DISA.... Oh, well, another $150.....
We've seen a LOT of these fail over the years, and it honestly surprises me to the volume. This part is on the intake side of things, and really shouldn't be subject to as much heat as some other plastic parts under the hood. Most of these failures are related to the flap being broken somehow, or leaks around the gasket where it mates with the intake manifold.

It's an easy fix, but it ain't cheap.
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  #11  
Old 01-29-2011, 09:09 AM
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bluebee bluebee is offline
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To those who already know their DISA is malfunctioning, you might want to look at this thread to see why you don't want parts of it flying through your engine and taking out cylinder #3!


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  #12  
Old 01-30-2011, 01:10 AM
jcourcoul jcourcoul is offline
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Good grief!

Betcha fixing that cost a wee bit more than a piddling new DISA!!
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  #13  
Old 01-30-2011, 03:35 AM
greghol greghol is offline
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Quote:
Originally Posted by jcourcoul View Post
Good grief!

Betcha fixing that cost a wee bit more than a piddling new DISA!!
Yep, That is why I had the Indy replace the intake boot and DISA when they did the oil separator (CCV)!

Greg
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