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X5 E53 (1999 - 2006)
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  #1  
Old 06-19-2012, 11:54 AM
Boola1341 Boola1341 is offline
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Can someone identifi this part of the engine??

There is a air whistling noise coming from that little box to the right of that dipstick. I think thats what causing the engine to run rough at idle after a while. The noise also sounds crackly. Its not a smooth sounding air leak. What is that box and can it be replaced??
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  #2  
Old 06-19-2012, 12:16 PM
Boola1341 Boola1341 is offline
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the truck is a 2003 x5 3.0i
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  #3  
Old 06-20-2012, 09:49 AM
Boola1341 Boola1341 is offline
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Anyone???

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  #4  
Old 06-20-2012, 02:06 PM
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tmvE39/E53/Z32 tmvE39/E53/Z32 is offline
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"DISA valve" a.k.a "Air Adjuster Unit"
Yes it can be replaced, cost about $175. Easy DIY.
How many miles on your X5? It can be serviced too http://www.germanautosolutions.com/BMW_Solutions.html
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Last edited by tmvE39/E53/Z32; 06-20-2012 at 02:10 PM.
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  #5  
Old 06-20-2012, 04:54 PM
Boola1341 Boola1341 is offline
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Car has 145k. Does the disa valve suppose to make a noisy crackle noise??

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  #6  
Old 06-21-2012, 09:19 AM
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tmvE39/E53/Z32 tmvE39/E53/Z32 is offline
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Yes. When the flapper and the pin no longer fit tightly. The pin can work it way out and damage your engine if neglected. There is some horror stories on this board regarding the DISA valve pin.
Read the link from German Auto Solution. I chose to upgrade them in both of my BMWs.
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03 DINAN 540iA M-Sport (For-Sale http://forums.bimmerforums.com/forum...-540iA-M-Sport)
01 //M5 (soon to be For Sale)
2000 Dinan S1 //M5 (my DD) 06 DINAN E53 4.8iS (wife's DD), 90 Straman Z32TT (my pride & joy ride)

Gone, but not forgotten: 01 E53 3.0i, 01 525i Sport and 91 Z32TwinTurbo

Last edited by tmvE39/E53/Z32; 06-21-2012 at 09:20 AM.
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  #7  
Old 06-21-2012, 09:43 AM
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seemyad seemyad is offline
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Quote:
Originally Posted by Boola1341 View Post
Car has 145k. Does the disa valve suppose to make a noisy crackle noise??

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No. It contains a diaphragm that forms a vacuum to hold the flap open at certain RPMs. It is very easy to take off and examine. If its crackling and such replace it. Two torx head bolts hold it in and there is one connector. May as well replace it regardless of the condition if you have the money to do so.

I had to remove my MAF sensor for easier access.

Last edited by seemyad; 06-21-2012 at 09:47 AM.
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  #8  
Old 06-21-2012, 11:02 AM
fauchpj fauchpj is offline
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Check your intake boot for cracks as well.
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  #9  
Old 07-17-2012, 06:58 PM
Mudnyrey Mudnyrey is offline
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Disa unit

Would this also cause a rough idle to?
I have been recenlty noticing that the engine has been running rough, while taking a friend home, the engine ran really rough like it was running on a few cylinders and had poor power as well.

I had the codes pulled on my vehicle and two codes pulled up: 1) PO171 &PO174 which both indicate the following possibilities which are; 1) MAF issue, 2) O2 Sensor(s) or least likely 3) Fuel pressure. Cleaning the MAF had no real effect and wasn't that dirty, but not entirely ruling it out that it may be bad.

While investigating I pulled up a few helpful posts of possibilities, from MAF which there are two Throttle body and secondary, CPS possibility Intake or Exhaust or O2 Front/Rear?


While the engine was running, I tapped on the box and the engine raised and lowered it's idle RPM. I checked and cleaned my MAF with some MAF cleaner.

I noticed some "Crackling, Rattling & Whistling" noises within the DISA unit better known as an Intake Runner Adjustable Unit. I easily removed the unit to find it all gunked up with carbon and such you would suspect. My evaluation found the flapper damaged and the pin in poor and damaged condition.

From my understanding and research, this seams to be a common problem! My X5 E53 3.0L has 147k miles currently.
I ordered the DISA unit and will be replacing it tomorrow.

Adjuster unit 1 11617544805 $212.50

I'll update this once replaced.

Mud~
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  #10  
Old 07-17-2012, 07:07 PM
Boola1341 Boola1341 is offline
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Thanks for the help.

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  #11  
Old 07-19-2012, 09:39 AM
Mudnyrey Mudnyrey is offline
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Replaced (DISA) Air Adjustable Unit.

Replacing the DISA unit was the problem and I was amazed by the new found performance and response of vehicle. The idle seems lower and much quieter. Even though I had my car diagnosed once replaced, it pulled up some old codes, however, I had the MAF and O2's checked, everything seemed to be working well and voltages to the MAF were spot on. My O2's.. My front was spot on as well, however my rear O2 after the CAT was reading 1.02vdc which is upper scale of 1.2vdc upper scale limit.

I'm heading back to the shop just to have the vacuum unit underneath the manifold checked just in case that has a minor vacuum leak. For a $45 check... I'm not complaining since that vacuum unit (Unsure of the correct name as of yet) is also another common problem after 80k+ miles.

Thanks for TMVe39 for the helpful link and good read!

Mud~
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