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      04-09-2013, 09:07 PM   #1
thelinux
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Is my DISA valve bad?

while researching cold engine start idle fluctuation, I learned about issues with DISA valve.

So I took mine out to inspect. Looked ok. no gunks and seals were fine. the pin is not loose so no rattling.

But, I can not hardly turn the valve by my hand. I admit that I am not a strong person but using two hands on the valve, i could only move it very little, like 1/6 inch maybe?

I felt if I use more force to open it, it would break. So I did not try any further. Is this normal or is the valve seized?

I really think it should not require a lot of force to open the valve by hand. My feeling says that I have a bad DISA valve. Can anyone confirm?
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      04-09-2013, 09:12 PM   #2
jeebus87
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Hey, I'm new here but I think the redesigned DISA valve in the refresh models is motorized and controlled by the DME and not the vacuum. So you shouldn't be able to move it by hand.
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      04-09-2013, 09:15 PM   #3
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There's no motorized DISA that I'm aware of. If you wind up needing to replace it, and don't mind the cost for a very upgraded part, you could go with the DISA Gold from GAS...

http://www.germanautosolutions.com/b...gold_valve.php
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      04-09-2013, 09:39 PM   #4
thelinux
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And I just found out that there are 2 different DISA valves on my engine?

http://realoem.com/bmw/showparts.do?...56&hg=11&fg=40

Number 2 and 3 in the diagram. What I checked today is number 2. Is the other DISA valve goes bad as well?
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      04-09-2013, 11:07 PM   #5
SgtGigglebox
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If DISA made a valve... I'm pretty sure it would be bad. zing?
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      04-09-2013, 11:35 PM   #6
thelinux
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got my answer from http://www.z4-forum.com/forum/viewto...p?f=34&t=36349 .
The flap is not supposed to be turned by hand.
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      04-09-2013, 11:51 PM   #7
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Quote:
Originally Posted by KevinC View Post
There's no motorized DISA that I'm aware of. If you wind up needing to replace it, and don't mind the cost for a very upgraded part, you could go with the DISA Gold from GAS...

http://www.germanautosolutions.com/b...gold_valve.php
You linked to the M54 DISA, which is not applicable to his engine. Quite confident that the N52 DISA is motorized. I think OP discovered this as well.
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