interesting boost issue on my 200TQA

[Grant Lenahan]

Since you are losing both air (compression) and water, the head gasket 
sounds reasonable.

Putting aside the water as a possible coincidence, you need to walk 
through the entire air chain, from the turbos to the manifold.  
Wastegates?

Do the usual too and check for water in oil and vice-versa.

Grant
On Aug 15, 2006, at 10:00 PM, tmb wrote:

> hello again, all.   before i forget, the car in
> question is my dual-knock-sensor, MC-equipped
> 1989 audi 200TQA.
>
> last week i had the spring/ECU mod done, and what
> a difference in power!  i'd been building myself
> up for it for ages, and i was not disappointed.
>
> however, i seem to have developed a boost leak
> somewhere.  what's happening is as soon as i'm
> showing 1psi of boost or greater, there's a
> non-mistakable sound of air rushing out from
> somewhere.  it's the exact same sound as when the
> intake manifold boot gives out.   the one on the
> car is a new aftermarket item that has been on
> the car for only about a month - but it's fine.
>
> i thought maybe the intercooler?  but the strap
> is holding tight, and i can see no signs of
> leakage.
>
> the other boost hoses have been inspected, but
> not off the car, as they are a bit difficult to
> get to.
>
> when the mods were first done, my boost guage
> showed a steady 16psi of boost.  the next day, it
> showed 11psi.  now it maxes out at about 9.  to
> say it's driving me nuts is an understatement.
>
> oh, and the car now consumes a whole lot of
> coolant.  keep in mind, it seems to start and
> drive just fine, and all of the plugs are what
> can only be described as a normal colour.
>
> compression test to follow, but sicnce the car
> runs so smoothly, i'm going to assume on the side
> of hope that the 4000km old head gasket is fine.
>
> anyways, if anyone has any input, i'd love to
> hear it.
>
> thanks again!
>
> jason
> tmb
>
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