[A4] Advice anybody...

Stock, Nicholas nicholas_stock at merck.com
Thu Jun 24 20:22:26 EDT 2004

Fellow A4 owners. I am asking for some advice/help. Last weekend a friend
and I took the front of the car off and replaced all the braided vacuum hose
with silicone hose, replaced the tt diverter valve with a nice shiny forge
diverter valve (very nice...) and also put in one of those polymer intake
manifold gaskets..and it was all pretty straightforward. Why would I do this
you ask? Well apart from having fun and getting my hands dirty, I've been
having over boost issues, whereby intermittently, wide open throttle would
cause pressure levels of over 20 psi and make the car shudder a bit (not
good). It does not do this in stock mode, only chipped mode (APR stage 1).
The guys at APR suggested a vacuum leak and I concurred, but now I'm
beginning to suspect that perhaps the waste gate on the turbo might be at
fault. Any body else have any ideas?

Many thanks,


Dr. Nicholas Stock 
Merck Research Labs San Diego
3535 General Atomics Court
San Diego
CA 92121
Tel: 858-202-5314

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