[s-cars] S4 Emissions Failure/also Bypass Valves

[Kaklikian, Gary]

My valve is actually the newer version they sell. Not the roundish one that came in different colors, but one that looks more like the Turbo XS valve. But the problem was exactly as you describe - leakage between the main body and the side tube.
Gary

-----Original Message-----
From: Pramuditya Oen [mailto:pramtt at pacbell.net]
Sent: Friday, May 24, 2002 10:48 AM
To: Kaklikian, Gary
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] S4 Emissions Failure/also Bypass Valves


Gary:

I also had a problem with the blue anodized TAP BP valve.  It was
actually also leaking at the connection between main body and the small
side tube on the BP valve.  I believe that they use somekind of browmish
epoxy/glue on them.

Pram
92S4

On Friday, May 24, 2002, at 09:12 AM, Kaklikian, Gary wrote:

> After giving my car the best tune-up it's ever had, replacing the
> throttle switch unnecessarily,  and even swapping ECU's with a stock
> one in a futile attempt to pass emissions,  we found the problem --- a
> vacuum leak. Yes, obvious, but not so obvious. There were no symptoms
> like hard starting or rough idle typically caused by vacuum leaks, only
> a slight stumble and high hydrocarbons off closed throttle.
>
> I had checked all hoses/clamps, sprayed carburetor cleaner on all
> fittings, etc, and then a  fellow S4 car owner says "let's pull the
> bypass valve." Sure enough, when removing the hose to the intercooler,
> the pipe on the bypass valve came off in the hose!  It was simply
> pressed/glued into the pos aftermarket valve from TAP (ok, my mistake).
> This is the latest generation valve they sell (think they call it the
> "group A"),  but I don't know who the manufacturer is.
>
> Fitted a stock Bosch bypass valve and the car now passes emissions by a
> wide margin, even with hollow kitties!
>
> RE: bypass valves - the Forge valve on my other car works well and
> appears to be higher quality than any other aftermarket ones I've used.
>
> Thanks for all the advice on this problem.
>
> Gary
> '92 S4
> '89 951
>
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