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General E46 Forum
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Old 03-19-2017, 03:18 PM   #1
bobaloo6
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Join Date: Mar 2017
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My Ride: 2002 330CI
2002 330CI DISA Valve Missing Flap

Sorry guys I'm a newbee! just realized that after posting this there was already a thread almost exactly the same, same questions etc. Should have checked more thoroughly.
I would still be interested to know if anyone can explain why the missing flap seemingly has no effect on how the car runs?

Hello All,
I just joined the forum today, however I have been using it as a non member for a while and love the great base of knowledge and information it provides.
I recently purchased a 2002 330CI (158K miles) about 6 months ago. I have never owned a BMW before and I absolutely love this car. I cant see myself driving anything but a BMW in the future. The car is in excellent shape and judging by the way it runs and drives I believe the one owner took excellent care of the car. No leaks, new clutch etc. I had it checked by BMW mechanic and he gave me the assurance that it is in excellent shape as well. The car looks and runs beautiful!
The only thing about it that bothered me, but was not a big problem, is the idle was a little rough when the engine was cold at first startup. Once the engine reached temperature, no problem , you sometimes can't even tell if the car is running the idle is so smooth. I am very meticulous about small details, so after reading posts on the forum and watching videos I found a lot of information that this could be caused by a dirty ICV valve. I finally had a chance to check the ICV valve out today and I am quite shocked at what I found. I never got to removing the ICV valve, when I was removing he DISA valve to get at it, I found there was no control flap on the DISA valve!
Holy crap! I looked inside the manifold as good as I can through the DISA valve hole but couldn't find anything.

So sorry for the long story but I wanted your guys opinions. I am hoping this was the previous owner/mechanics decision that they found this damaged during maintenance, removed the damaged pieces and didn't want to replace it $$$. Since the car runs fine without it. However, my concern is, if this is not the case and the piece is inside the manifold somewhere, I'm thinking its a disaster waiting to happen. I will definitely replace the valve but do you think I should have a mechanic open the manifold to see if the flap and holding pin is indeed somewhere inside? I am pretty sure this a silly question and should be done, but I was wondering if you guys had ever seen this, what would you do in this situation and why does the car seem to run so well without it?

Any thoughts on this would be appreciated.

Thanks!

Last edited by bobaloo6; 03-19-2017 at 03:30 PM. Reason: duplicate thread
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Old 03-19-2017, 03:29 PM   #2
jfoj
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If the rear pin is missing, someone likely removed the flap and pin.

If the rear pin was still in the frame, then I would be looking for a flap in the intake.
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Old 03-19-2017, 04:56 PM   #3
BaliDawg
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You can search for the detailed explanation of how the DISA operates, but essentially it switches the intake runner between short and long tubes. It is closed most of the time except under midrange RPMs starting around 4000.

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Old 03-19-2017, 06:53 PM   #4
shoman24v
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I doubt there's any reason to remove the manifold. If the pin got sucked in your motor would be done.

Replace the DISA valve. You're probably only thinking the car is running well.

When I purchased my 330 a couple months ago it already had a bad DISA. No big deal, right? But when I removed the DISA to replace it the pin fell out and landed on the flat plane in the manifold
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Last edited by shoman24v; 03-19-2017 at 06:57 PM.
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Old 03-19-2017, 07:27 PM   #5
jfoj
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Replace the DISA, it is there for a reason. It will help with driveability, performance and fuel economy.

The rear DISA pin only falls in to the intake when removing the DISA. So if the pin it not in the rear of the cage, someone removed the pin and flag.

DO NOT consider and aftermarket replacement, BAD IDEA. Search and you will see.
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Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

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Lower hose temp switch O-ring - BMW #13621743299
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Old 03-19-2017, 07:37 PM   #6
jmo69
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If the vacuum pot is still good you can get the G.A.S. kit, but without the flap it's pretty hard to test.
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Old 03-19-2017, 07:40 PM   #7
jfoj
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It should be able to be tested even without the flap, but you have to use your head and understand what is required to test the diaphragm.
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Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 03-20-2017, 09:26 AM   #8
ChadTsunami
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How long do the DISA valves typically last? And is there a way to remove an old DISA without having that pin fall out?
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Old 03-20-2017, 09:48 AM   #9
BaliDawg
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Quote:
Originally Posted by ChadTsunami View Post
How long do the DISA valves typically last? And is there a way to remove an old DISA without having that pin fall out?
Probably 60k miles, but it varies. I would at least check the DISA every 20k-30k miles or so; it's easy enough to remove.

The pin will only fall out when removing your DISA if it's really far gone. It sits horizontal so just slowly and carefully remove the DISA. There's not enough space for the pin to fully come out when the DISA is installed.
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Old 03-20-2017, 01:50 PM   #10
jfoj
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Quote:
Originally Posted by ChadTsunami View Post
How long do the DISA valves typically last? And is there a way to remove an old DISA without having that pin fall out?
I would say the DISA O-ring does not last very long, while my E46 was still under the 48 Month/50k Mile Bumper to Bumper Warranty the DISA was replaced, mainly due to a leak in the O-ring.

But I would say most DISA's may make the 80k-100k mark depending on how the car is driven. But the DISA O-ring may only last 40k miles.

The more the engine is started the more the DISA probably gets exercised.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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