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      09-21-2013, 04:43 PM   #1
monkey_wrench
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330i DISA Problem.

Had been noticing some reduced power in the <4K rpm range, and some rattling, much like engine knock.

Read up on it, and found a few threads about DISA issues, somewhat matching my findings. So I pulled #1 today:



Valve missing!

Managed to salvage this from the aft section of the intake manifold.



Only thing missing is the top pin portion. I will be pulling my manifold off entirely in an attempt to find it. I think if anything, it went down in the manifold, but may be interfering with DISA #2.



More parts to order.

FWIW, 127K miles.


***Update - took the manifold off, and found the piece missing. Shook it out, and put the manifold back on. Not a bad job, about 2 to 2.5 hours to remove and reinstall.

Last edited by monkey_wrench; 09-22-2013 at 03:02 PM.
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      09-22-2013, 06:29 PM   #2
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Wow. Would never have suspected that... Yikes!
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      09-23-2013, 02:56 PM   #3
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Originally Posted by e90pilot
Wow. Would never have suspected that... Yikes!
Me neither. A bad motor perhaps, but not this!
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      09-23-2013, 03:06 PM   #4
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Glad nothing made it into the engine! Did your car throw any codes? How much did a new DISA valve cost?
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      09-23-2013, 03:22 PM   #5
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Whats DISA? where did you take that part from (first photo)?
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      09-23-2013, 03:43 PM   #6
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Just like on the e46 DISA valves you need to be sure to check them periodically. I have seen grenaded m54's due to a small piece of the valve going through the valves and into the combustion chamber.
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      09-23-2013, 03:52 PM   #7
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Quote:
Originally Posted by GoRomeo View Post
Whats DISA? where did you take that part from (first photo)?
I'm quite surprised you don't already know givin how long you've been here and your post count. DISA valves are flaps in the intake manifold that change the resonance properties of the intake. The second picture is the actual flap which belongs inside that square in the first pic. There are two of them, a large one and a small one located on each side of the intake manifold. They open at set rpm: the first at around 3000rpm and the second at 4500rpm. Your 330 is equipped with these from the factory. 325s did not have them. This was one of the main differences between the two cars and the primary reason the 330 was more powerful and torquey.
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      09-23-2013, 04:29 PM   #8
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Quote:
Originally Posted by e90pilot View Post
I'm quite surprised you don't already know givin how long you've been here and your post count. DISA valves are flaps in the intake manifold that change the resonance properties of the intake. The second picture is the actual flap which belongs inside that square in the first pic. There are two of them, a large one and a small one located on each side of the intake manifold. They open at set rpm: the first at around 3000rpm and the second at 4500rpm. Your 330 is equipped with these from the factory. 325s did not have them. This was one of the main differences between the two cars and the primary reason the 330 was more powerful and torquey.
Yeap first time I hear about DISA valves but thanks for the explanation. I learned something new today..

I wonder if there is a way to check these?
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      09-23-2013, 04:37 PM   #9
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Quote:
Originally Posted by Johnny D View Post
Just like on the e46 DISA valves you need to be sure to check them periodically. I have seen grenaded m54's due to a small piece of the valve going through the valves and into the combustion chamber.
They improved the part, I think the E46 design had metal in it, this type of failure is not very common.
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      09-23-2013, 05:03 PM   #10
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Quote:
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They improved the part, I think the E46 design had metal in it, this type of failure is not very common.
Well it is plastic and lots of heat cycling will weaken it. Knowing BMW's track record with plastic. I'm not surprised. I'm gonna check mine as I'm having a power hiccup right when the first DISA valve opens.
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      09-24-2013, 04:13 AM   #11
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When I had trouble with mine it threw a code. Luckily it wasn't broken off but the motor had no resistance.
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      09-24-2013, 10:21 AM   #12
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Quote:
Originally Posted by GoRomeo View Post
Whats DISA? where did you take that part from (first photo)?
Right above the throttle body on the intake manifold
Remove your air box, tubing up tot he throttle body, and then remove 4 torx and it's out. The secondary one though will be the problematic one, it will most likely require you to remove the intake manifold altogether.

I spoke with the parts guy at BMW about it, and BMW has improved the design over the E46 ones, which used a metal clip to hold the valve in.
He told me they usually don't see these things fail like this, but as posted before, the motor failures, or seal failures.
Having said that, the current part number for the DISA valve is the 3rd revision on it.

I had no codes, as the base of the unit was still there, and as far as I know, the motor was still turning.
I noticed lag below 4K rpm, and an intermittent rattle.



Here's my valve and the parts I retrieved from the intake.

My new DISA is on order and I'll install it Friday night when I get back in town. I am driving the car in the mean time, it runs just fine, but as before, seems to lag just a bit below 4k rpm.
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      09-24-2013, 10:25 AM   #13
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How many miles do you have on your ride ?
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      09-24-2013, 11:19 AM   #14
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Quote:
Originally Posted by monkey_wrench View Post
Right above the throttle body on the intake manifold
Remove your air box, tubing up tot he throttle body, and then remove 4 torx and it's out. The secondary one though will be the problematic one, it will most likely require you to remove the intake manifold altogether.

I spoke with the parts guy at BMW about it, and BMW has improved the design over the E46 ones, which used a metal clip to hold the valve in.
He told me they usually don't see these things fail like this, but as posted before, the motor failures, or seal failures.
Having said that, the current part number for the DISA valve is the 3rd revision on it.

I had no codes, as the base of the unit was still there, and as far as I know, the motor was still turning.
I noticed lag below 4K rpm, and an intermittent rattle.



Here's my valve and the parts I retrieved from the intake.

My new DISA is on order and I'll install it Friday night when I get back in town. I am driving the car in the mean time, it runs just fine, but as before, seems to lag just a bit below 4k rpm.
Thank you monkey wrench! I wonder how mine are?

How many miles do you have?
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      09-24-2013, 02:59 PM   #15
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For everyone who can't read, he has 127K miles.
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      09-24-2013, 09:12 PM   #16
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Quote:
Originally Posted by e90pilot View Post
I'm quite surprised you don't already know givin how long you've been here and your post count. DISA valves are flaps in the intake manifold that change the resonance properties of the intake. The second picture is the actual flap which belongs inside that square in the first pic. There are two of them, a large one and a small one located on each side of the intake manifold. They open at set rpm: the first at around 3000rpm and the second at 4500rpm. Your 330 is equipped with these from the factory. 325s did not have them. This was one of the main differences between the two cars and the primary reason the 330 was more powerful and torquey.
can u show me on pic how looks those disa valves ??
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      10-11-2013, 06:59 PM   #17
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I have same symptoms. looks like I have a new project for tomorrow, pull manifold.
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      10-14-2013, 12:13 AM   #18
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Follow up, to my post above. Pulled entire manifold, very oily inside. When I sat it down there was literally a puddle. The big DISA was soaked, so was the small one, both flaps were intact but the green seal around the flap was missing pieces. Both flaps were open and would not move (normal from what I have seen). Suspect CCV oil separator is bad. Still no clue what is making my rattling noise. The metal throttle body butterfly valve was dirty too, burnt on oil. Should that thing be closed when removed? Mine has a small gap between body and butterfly, and doesnt close fully unless I push it manually.
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      10-14-2013, 02:30 AM   #19
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I would take the car to a mechanic. But, since your there (already pulled the manifold) you can replace the DISA regulators, the external oil separator, and associated piping/tubes.

If your have not done so yet, I would also replace the vanos sensors.

I think your gurgling sound and loss of power is the caused by a failing separator or some combination.

-ATW
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Last edited by smellthebeans; 10-14-2013 at 02:51 AM.
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