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

[Pramuditya Oen]

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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