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

[Kaklikian, Gary]

I don't remember seeing the valve on your car Chad, but it sounds like the same one (and probably from the same source).

If anyone would like to take my valve and have it welded, make me an offer. Personally, I'm going to stay with the stock Bosch valve I bought in a pinch, and go with a Forge if and when it fails.

Gary



-----Original Message-----
From: Chad Clark [mailto:chadclark at qwest.net]
Sent: Friday, May 24, 2002 4:46 PM
To: Kaklikian, Gary; Pramuditya Oen
Cc: s-car-list at audifans.com
Subject: Re: [s-cars] S4 Emissions Failure/also Bypass Valves


Gary, as you know I have this same valve. If any of you have this newer,
adjustable from the top via a 10mm? wrench valve, I strongly recommend that
you have this 'body to side tube' portion of the valve welded together. It
seems that this is an eventual failure point as it is only glued together.
The valve did work flawlessly for two years before I noticed the failure.

 I paid $40 to have a company here in Boulder weld the sucker up(dissasemble
the valve before welding!). Yes, if I had known of this problem prior to
buying it, I would have gone with a Forge/Bailey but now this valve should
be good forever. HTH,

Chad


on 5/24/02 1:07 PM, Kaklikian, Gary at Gary.Kaklikian at hp.com wrote:



> 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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