All Things Mk5 > How to Guides / Troubleshooting

Diverter Valve

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bigkenny1781:
Hi,

Just a quick question for you lot - how can I check if my diverter valve is past it's best - the car goes okay, but not like a rocket and the economy is okay, but nowhere near what the manufacturer claims ...

I'm thinking it could be the diverter?!?!

TonyZed:
Hi Mate

I'm replacing mine over the weekend, so I might be able to tell you Monday if my symptoms are the cause of a duff DV.

Apart from what you describe, lack of performance and poor fuel economy, I can hear a continual whistle after the initial whoosh that you normaly get. Wind your window down and have a listen as you release the accelerator. Keep your foot slightly on the gas and you might get the same as me.

The only other way is to take it off and have a look, there are plenty of post on here that show you what to expect.

TonyZ

vRStu:
It's quite a simple job to whip it out and inspect it.  If you have VCDS then often you'll see a fault code stored.

GNJ_Motorsport:
They do go quite often, particularly on mapped cars.

TonyZed:

--- Quote from: vRStu on July 08, 2011, 09:58:55 am ---It's quite a simple job to whip it out and inspect it.  If you have VCDS then often you'll see a fault code stored.

--- End quote ---

Stu, I'm not sure what you were "whipping out and inspecting," but I'll have to remember next time a youngster like yourself says it is a simple job, I should remember my age (and size!)

Well I thought I'd try anyway!! :happy2:

It started badly for me when the wheel decided to be stubborn, and not come off as easily as it should, and I have had over 40 years of practice so it's not a new experience for me.
However, having managed that, I removed the inner wing lining, and then struggled for some time to remove the old DV. I do have some reasonable kit, including a socket set with cv joint type extensions. I couldn't get enough purchase with even my best alan keys to loosen the bolts, so without the socket set and attachments it would have been impossible. You do have to be a bit of a contortionist for sure.

At first it looked ok:



But then I looked closer



Though black marks around the diaphragm look like the beginnings of more splits too.

Anyway, after much cursing, and lots of skinned knuckles, I finally got it all back together and went for a test run.

 :jumpmove: :jumpmove: :jumpmove: is all I can say, it's so good to have my boost back.

So to the OP, if you can hear  a whistle continuing after the whoosh when you ease of a bit from hard throttle, then your DV is probably shot.

TonyZ

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