Boost problems

Mike Miller mikemilr at
Sat Oct 5 09:54:39 EDT 2002

----- Original Message -----
From: "Eyvind Spangen" <eyvind.spangen at>
To: <200q20v at>
Sent: Saturday, October 05, 2002 6:03 AM
Subject: Boost problems

> I'm only getting 1.7 bar indicated on the dash gauge. I have checked
> for leaks, replaced bypass valve and WGFV, I even tried blocking the
> hose to the wastegate, but then I only got 1.6.. I tried using
> regulated, pressurized air on the small line to the ECU, I adjusted it
> to about 2 bar absolute pressure, the dash gauge shows 1.9 max. With
> the standard pressure transducer should this be correct, right?
> But I still wonder why it doesn't give full boost, even with the lower
> wastegate hose blocked off.. When I did this on my old 200q10v, it hit
> the overboost cutoff very quick..
> I removed the top cap on the wastegate, everything looked normal in
> there..
> I tried pulling codes, nothing.. (4444)
> Any good tips? I'm really puzzled..
> --
> E. Spangen
> '90 Audi 200TQ20v

My understanding is that when that wastegate hose is clamped off, the only
thing holding the WG closed is the spring pressure. You should hit overboost
very fast as you say you did in the 10v. I can think of only two
possibilites - a torn diaphram or the WG valve not fully closing/seating.The
WG is pretty easy to remove and disassemble.

mike miller
helmville mt

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