Dan's Boost Problem

Dan Simoes dans at audifans.com
Tue Jun 18 12:20:31 EDT 2002

I appreciate the theories.
The problem with a) is that no codes are being shown, and disconnecting
the connector does throw a code, so the unit is functioning properly,
and the wiring to the ECU is intact.

b) can be tested by seeing if the wastegate holds vaccum, right?

John Mallick wrote:
> Since the boost is intermittently there and then not, and the problem is
> there even with an ECU swap and there are no pressure leaks, I vote for:
>     a) bad electrical connection to the wastegate frequency valve
>     OR
>     b) bad wastegate diaphragm
> You can test hypothesis b) by clamping off the pressure control hose to
> the wastegate and see if the car goes into overboost, I believe.
> I had a similar problem which turned out to be a WGFV with high (300
> ohm) resistance...sometimes it worked OK, and sometimes the boost just
> dropped out after building fine.  A poor electrical connection might do
> the same thing.
> Just my $0.02.
> John Mallick (from my off-list address)
> 200q20v  147K miles and ticking...
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