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Hi all,
Had the RS4 for about 6 weeks now and took if for a service today and was advised that when they checked on the Vagcom it indicated that one of my manifold flaps was stuck open?
With knowing nothing at all about this subject I asked what it meant. I was told that if all the valves are open I wouldn't be able to accelerate but this made no sense to me.
Can somebody please advise what thus means, what causes it, how can it be rectified and costs involved?

They have a tendency to get stuck, especially with lots of carbon around and or a shaft bushing or flap positioning sensor being off (you have 2). What I did - carbon cleaned, and coded out the flap error message and good to go. If you have issues mechanically the the either new manifold or pull them and get covered by the re-coding. So if I pull mine in the future I should still have no dash/code issue. I think they are supposed to increase torque with added turbulence but what the heck do I know! I hear that people pull them often with little to no feeling of lost torque. Have your car been carbon cleaned? If not, I would look into that. Good luck.

Hi mate it's not an uncommon problem, I've just sorted mine out.
Unfortunately it's not an quick fix, they stick open or closed due to carbon build up on the inlet manifold so you are in need of a carbon clean (decoke) research it buddy there's lots of threads on how to etc etc or go to MRC but it will cost you, quite a few people do it them selfs if you are half about with tools & have a fair bit of time on your hands.
You can either keep the flaps or remove them as i have to hopefully help prevent build up so fast & again hoping for performance gains but will then required a remap to delete the flap sensors.
You will also be down on power as it will put your car in a mild limp mode ie you wont have full rev range!
Good luck hope this helps, good luck.

TAB1S wrote:Hi mate it's not an uncommon problem, I've just sorted mine out.
Unfortunately it's not an quick fix, they stick open or closed due to carbon build up on the inlet manifold so you are in need of a carbon clean (decoke) research it buddy there's lots of threads on how to etc etc or go to MRC but it will cost you, quite a few people do it them selfs if you are half about with tools & have a fair bit of time on your hands.
You can either keep the flaps or remove them as i have to hopefully help prevent build up so fast & again hoping for performance gains but will then required a remap to delete the flap sensors.
You will also be down on power as it will put your car in a mild limp mode ie you wont have full rev range!
Good luck hope this helps, good luck.

It must be a common problem - with both of us stating the same thing!

Thanks for the info, I'm in Lancashire so is there anybody localish that could do the clean, how much would it be and how long of a job is it?
Thanks

kevconn wrote:Thanks for the info, I'm in Lancashire so is there anybody localish that could do the clean, how much would it be and how long of a job is it?
Thanks

Yes mate unit20 are close to you, mrc are about£600 for a basic clean going up to £1100 for a deflap etc look on there web sites mate.

Mine was throwing up an engine management light - Vagcom showed a manifold flap issue. I took it to MRC for a decoke and to have the flap removed then a map to map out the sensor. THe fault didn't cause any noticeable issues with the car, other than a permanetly lit engine warning light (not good for the MOT).

Gonna do a bit of ringing around tomorrow so I have a better understanding of what's going on. Don't really want to be deleting flaps and remapping. I more bothered about how long the job takes as I use car every day.

kevconn wrote:Thanks for the info, I'm in Lancashire so is there anybody localish that could do the clean, how much would it be and how long of a job is it?
Thanks

Had mine done at Awesome GTI in Manchester last year, and it gave me around 80bhp back! The difference was night and day!

What did you do in the end mate?

Hijacking every manifold thread lol

I had my inlet flaps removed and mapped out by Regal. They did a stellar job and, along with a carbon clean, when from 380hp to 420hp.

jordanbutters wrote: ↑

Tue Aug 21, 2018 9:40 pm

I had my inlet flaps removed and mapped out by Regal. They did a stellar job and, along with a carbon clean, when from 380hp to 420hp.

What did it cost in the end mate ?

I can’t remember now as I had a load of other work done too. Give Regal Autosport a call and mention that Jordan recommended them and they’ll quote you over the phone.