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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 02-06-2008, 12:26 PM
DallasBill DallasBill is offline
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DISA flap failure -- a common issue?

Just curious here. My car was in for the instrument cluster pixel fix and to replace the power steering system hoses under CPO. I also had what sounded like a rattling valve lifter. It turned out to be the DISA flap assembly -- used to control the dual resonance intake system.

I have never heard of such a part before. Anyone know if this a common failure? The car has 55k on it.
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  #2  
Old 02-06-2008, 12:35 PM
2002_530i 2002_530i is offline
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Got any details on what/where this is? I have never heard of this particular item.

Chris
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  #3  
Old 02-08-2008, 09:39 AM
DallasBill DallasBill is offline
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It's called the dual resonance intake system in English (DISA is the German acronym).

It's a flap in the intake manifold (intake manifold solenoid valve) to vary the length of the intake runners and tune performance at different engine speeds. DISA valve controls the variable length intake manifold. On the side of the intake manifold, it gives better torque at low revs by closing keeping the intake runner long. After about 4000rpm, it opens up and makes the intake runners shorter for more horsepower.

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  #4  
Old 02-08-2008, 04:01 PM
porksoda porksoda is offline
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hah... varial intake manifolds are a great invention.

I dont know about our 530s but i know on other cars i have owned those things wore out and effected the performance and caused noises.

If the bm part is plastic i woudlnt be surprised if it wears out and gives you noise specially at a specific rpm.

what kind of noise were you getting anyway... if you had to explain it?
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  #5  
Old 02-11-2008, 11:37 AM
DallasBill DallasBill is offline
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3rd sentence, first post.
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  #6  
Old 02-11-2008, 12:05 PM
DanT DanT is offline
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fairly common on m54 engine
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  #7  
Old 02-12-2008, 09:18 PM
porksoda porksoda is offline
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Quote:
Originally Posted by DallasBill View Post
3rd sentence, first post.
i havnt seen the internals of it... but it should be a fairly easy diy... it should be close to the intake..

i wonder why yours is making noise .. if its a used car maybe it was "abused" a lot before you got it?
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  #8  
Old 02-13-2008, 07:21 AM
Jase007 Jase007 is offline
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I've taken mine apart on my M52TU motor and it is all plastic with rubber edged seals. Typically, it is caked with oil residue / varnish and this can prevent it from closing. It is a pretty flimsy piece and I wouldn't be surprised of failures.

Easy DIY b/c is right there in front of you looking at top driver's side of intake manifold in the middle. Easily removable electrical connection and then a few nuts / bolts to remove. I cleaned mine up with solvent and dental pick around the runner edges. Treated rubber with Wurth rubber care and reinstalled. I was getting "in there" to clean ICV and preventative maintenance to replace intake air temp sensor when I removed mine and cleaned / treated.

FWIW
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  #9  
Old 03-01-2012, 06:14 PM
mjbennett9 mjbennett9 is offline
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I was doing my ICV (helped a lot) and noticed my DISA was dirty but I wouldn't say a mess. I was tempted to clean it, but wasn't sure what part(s) to focus the cleaning on? and what cleaner to use? I have MAF, throttle and brake cleaner on hand. Also, that seal is not OEM replacable but heard of a place on ebay. However, I emailed him and he never replied. He has the DISA rubber ring for a 540 and 528 i think but 525i was not listed. anyway, any help on what to clean (where) and with what cleaner is appreciated.

Also, there's about a 1/4" of free play in either direction from where you see the flap now. However, if I move it closed, it's got plenty of tension to spring back. not sure if either of those conditions is a good or bad thing?
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  #10  
Old 03-01-2012, 10:26 PM
fortunateson fortunateson is offline
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Check out German Auto Solutions or Disa valve repair kit thread.
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  #11  
Old 03-01-2012, 10:57 PM
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doru doru is offline
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Quote:
Originally Posted by mjbennett9 View Post
I was doing my ICV (helped a lot) and noticed my DISA was dirty but I wouldn't say a mess. I was tempted to clean it, but wasn't sure what part(s) to focus the cleaning on? and what cleaner to use? I have MAF, throttle and brake cleaner on hand. Also, that seal is not OEM replacable but heard of a place on ebay. However, I emailed him and he never replied. He has the DISA rubber ring for a 540 and 528 i think but 525i was not listed. anyway, any help on what to clean (where) and with what cleaner is appreciated.

Also, there's about a 1/4" of free play in either direction from where you see the flap now. However, if I move it closed, it's got plenty of tension to spring back. not sure if either of those conditions is a good or bad thing?
It starts going South on you. I can bet you have a also a faint whirr. The play is not normal - the flapper should be tight throughout the turn.
+1,000,000 to what Fortunateson told you. Go and get the DISA repair kit. It's much cheaper than a new DISA valve, and the way Gary build it, it seems the DISA will last forever with the updated part.
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  #12  
Old 03-02-2012, 02:29 PM
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bluebee bluebee is offline
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This is an old thread resurrected so I will simply post more recent DISA-related references ...

- Where to get a proper DISA valve repair kit (1) & how some jury-rig 'repair' a rattling DISA unit (1) (2) (3) & how the DISA valve operates (0) (1) (2) (3) (4) & how to test DISA operation (0) (1) (2) (3) (4) & a simple DIY to install an M54 DISA (1) & a nice DISA autopsy (1) (2) & a great DISA group buy (1) & how the disa valve o-ring fails (1) (2) & how it can reputedly cause all sorts of cold-engine rough idle problems (1) (2) & where to get just the DISA valve o-ring (1) & why you want to check the DISA at 100K miles or whenever the airbox is removed (1) (2) & why the DIfferenzierte SAuganlage ("Differential Air Intake") valve flap breaks (1), sometimes with parts sucked into the intake manifold (1) (2) (3) (4) (5) (6) (7) (8) & a well documented example of how a broken DISA flap can ruin your engine (1) & yet another seemingly complex set of misfire codes reputedly traced to a broken DISA valve (1)
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #13  
Old 03-02-2012, 02:33 PM
mjbennett9 mjbennett9 is offline
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thank you! sad, but this is what ill be doing on my friday night :-) reading the forums. :-)

thanks again!
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  #14  
Old 03-02-2012, 04:03 PM
coopster530 coopster530 is offline
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DISA thread

Here ya go.

My karma and payback.

http://www.bimmerfest.com/forums/sho...21#post6568221
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