[2..7t] hunting for boost leaks?

[David Kavanagh]

come to think of it, I could probably do just that. There is a hose
coming from the MAF at the air box to the top middle back of the
engine where that "y" pipe splits the air off for both turbos. That
seems like a good place to try a "cap". I'll have to measure that! If
I get a good solution, I'll post a parts list and a picture on my web
site. I have 2 of these cars, so it will surely pay off!

David


On Wed, 10 Nov 2004 09:13:24 -0500, eric_r_kissell at whirlpool.com
<eric_r_kissell at whirlpool.com> wrote:
> 
> Intake and pressurize the intake with low pressure using an air compressor
> or maybe a garden sprayer.
> 
> Then you can look and listen for leaks.
> 
> There has been talk about making an adapter using a readily available
> plumbing cap that fits the hose from the airflow meter on the 1991 200q
> 20v. Yours may be similar
> 
> HTH,
> Eric
> 
>                       David Kavanagh
>                       <audiguy at gmail.co        To:       Q-list <quattro at audifans.com>
>                       m>                       cc:
>                       Sent by:                 Subject:  [2..7t] hunting for boost leaks?
>                       quattro-bounces at a
>                       udifans.com
> 
>                       11/09/2004 10:19
>                       PM
>                       Please respond to
>                       David Kavanagh
> 
> 
> 
> 
> I was measuring block 115 which shows expected boost and actual boost
> as the car is running. From what I can tell, the actual values are a
> bit off from the expected values when the engine is under load. So, I
> went on a hunt for a boost leak (I should also mention, I've been
> monitoring a MAF with low output for many months now).
> I tested the bypass valves. They both hold a vacuum and the diaphram
> moves predictably as I apply a vacuum. I checked that hose that
> connects the 2 pipes to the throttle body. I felt around after
> unhooking those 2 pipes and can't feel any rips or tears. The hoses
> that connect to the bypass valves seem intact also. Are there any
> others I should have been worrying about? Anything else that might
> cause low boost?
> Bear in mind, I don't know if the boost is all that much lower than it
> should be. I might also be seeing lower boost because the MAF output
> is lower than the computer can adjust for (via fuel trim). It still
> isn't throwing certain codes that will cause Audi to replace it under
> warranty (which is my goal instead of shelling out $250 for a new one
> myself).
> Anyway, any other trouble areas with respect to boost leaks on these
> engines?
> 
> Thanks,
> David
> 
> --
> '00 A6 biturbo 6-speed
> '01 allroad 6-speed
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-- 
'00 A6 biturbo 6-speed
'01 allroad 6-speed