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      10-15-2015, 10:30 AM   #1
Suhb
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DISA Upgrade/Repair

Hey guys. I'm sure everyone knows about DISA valves failing in the older engines but has anyone run into DISA problems on the n52 engine yet? Apparently the DISA motors for the N52 can show problems as well. Has anyone has done either of these or plans to do a repair/upgrade in the future? the three stage intake manifold is on my mod list and I'm wondering if it's wiser to just do the upgrade/repair before installing it. Thoughts?

http://www.bimmerfest.com/forums/sho...d.php?t=792912

http://vanos-bmw.com/repair-kit-for-...-n52-n52n-n52k
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      10-15-2015, 08:17 PM   #2
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I bought all new parts when I did the Stage 3...if you buy a used manifold, get new valves.

I've read about the problems, but I believe there's many, many more cars that never had DISA problems...assuming I keep the car long enough, I'll probably replace the valves after 20k miles or 2-3 years...they're not that expensive.
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      10-16-2015, 02:11 AM   #3
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61k on my N51 and the DISA valves haven't given me any problems yet.
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      05-17-2016, 12:08 PM   #4
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I have a 2011 128i with over 116K, and I'm consistently seeing a 002AAC code now. I'm going to start by replacing the upper DISA, since I don't have to remove the intake manifold for that, then replace the lower if that doesn't do the trick. It's too bad that the DISA valves can't be rebuilt for the N52K.
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      05-18-2016, 12:07 AM   #5
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Wow, www.i6automotive.co.uk does manufacture a DISA repair kit. rhydtuned makes the rebuild look easy in this video:
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      05-23-2016, 06:51 PM   #6
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Mine failed around 70k miles combined on manifold plus my car. Was the last thing I repaired before I sold it.
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      05-23-2016, 08:02 PM   #7
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Originally Posted by TheSt|G View Post
Mine failed around 70k miles combined on manifold plus my car. Was the last thing I repaired before I sold it.
I'm confused. You sold the 1er?
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      05-24-2016, 07:34 AM   #8
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Originally Posted by Suprgnat View Post
I'm confused. You sold the 1er?
Yes.

Bought an Interlagos on Cinnamon E46 M3 that I'm manual swapping next week.
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      05-24-2016, 04:15 PM   #9
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2008 BMW 128i  [5.00]
Quote:
Originally Posted by TheSt|G View Post
Yes.

Bought an Interlagos on Cinnamon E46 M3 that I'm manual swapping next week.
Nice! but you had an awesome 1er! Will be missed here
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      05-24-2016, 08:27 PM   #10
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Quote:
Originally Posted by TheSt|G View Post
Yes.

Bought an Interlagos on Cinnamon E46 M3 that I'm manual swapping next week.
Nice on getting the E46 M3. Sad that you sold your 128i though. Your DIY threads were always very informative.
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      06-03-2016, 04:58 PM   #11
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Quote:
Originally Posted by chris82 View Post
Nice! but you had an awesome 1er! Will be missed here
Quote:
Originally Posted by Fume View Post
Nice on getting the E46 M3. Sad that you sold your 128i though. Your DIY threads were always very informative.
Thanks gents. Ultimately, I justed wanted a bit more performance.

Did the VANOS rebuild and lockdown on the M3 last month. It's actually a pretty easy/fun car to wrench on if you get a chance.
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      06-07-2016, 10:11 AM   #12
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Hey Guys,

I replaced the upper DISA and the 002AA8 fault code is gone. The car feels like it has more low RPM power, and runs slightly smoother. However, I'm still regularly seeing the 002AAC (variable intake manifold, self diagnosis) fault message.

Should I pull the intake manifold and replace the lower DISA, or should I ignore this fault code?

Thanks!
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      06-11-2016, 07:36 AM   #13
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Hey Guys,

I'll try this one again. Has anyone out there replaced their lower DISA? Was that the only way to make all faults go away? I'll rip out that intake manifold if I must, but I was hoping to get some guidance from you all.

Summary: DISA upper replaced after seeing 002AAC and 002AA8 fault codes. Now just 002AAC remains consistently.

Thanks!
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      06-11-2016, 09:44 AM   #14
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Quote:
Originally Posted by gratuitous View Post
Hey Guys,

I'll try this one again. Has anyone out there replaced their lower DISA? Was that the only way to make all faults go away? I'll rip out that intake manifold if I must, but I was hoping to get some guidance from you all.

Summary: DISA upper replaced after seeing 002AAC and 002AA8 fault codes. Now just 002AAC remains consistently.

Thanks!
Grat
You might have more luck over at E90Post (in the N52) section, as you'll reach a lot more people over there. I've not heard of any people over on this side having to replace there DISAs yet (other than in this thread).

That's interesting that you got a couple of fault codes. I was wondering how easy the issue would be to diagnose if it occurred. Did you get a CEL or SES light, or did you just notice a downgrade in performance, and then check for codes? Ho noticeable was the degradation in performance?

FWIW, if I were you, I would just go ahead and change the second DISA. I mean, you changed one and it cleared one fault, and one remains. And it seems reasonable to change both simultaneously (although it seems weird that they would fail simultaneously, it also seems like if it's a wear issue that they would have similar service lives).

EDIT: Doing a quick Google of that fault code, I don't see what else the issue could be. I might run the car by an indy to see what they think if you really want to know for sure before ripping the intake manifold out, if that's your hesitation.

Just out of curiosity, is your car an N51 that cam stock with the DISA motors, or an N52 where they were added afterwards? Mine is an N52, and I swapped in the 3-stage manifold - I'm wondering if my car would even "know" these codes in case of DISA failure? I know they work without coding, and the fault code most come from a problem downstream (AFR sensor or something), so it probably would.
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      06-11-2016, 01:00 PM   #15
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Thanks for the reply.

Mine is an N52K that came stock with two DISA's in the manifold. There were no CEL or SES lights displayed. I purchased this car used, and therefore had no idea what the acceleration should feel like had the car been new. I only discovered the codes, because I was trying to sort out a right cornering light issue (different thread), which does display as a dash warning on start-up. I was also performing an whole car maintenance reset due to not quite knowing how the car had been maintained by the previous owner, and wanted to see what other sort of faults were occurring.

The degradation in performance was a subtle, low RPM sort of thing. When accelerating hard, I would notice a sort of drop in power between 3500 and 4000 RPM, and then get a surge of power after 4000 RPM. The engine definitely puts out more power at low RPM's now. You can definitely feel the increase in power in the seat of the pants, and the drop in power between 3500 and 4000 is not longer as harsh as it used to be.

I appreciate your recommendation for posting over on the e90 forum, and I may just replace the lower DISA for the heck of it.

Cheers,
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