Boost Goes Away

Tom Mullane tmullane at
Sat Oct 26 23:11:30 EDT 2002

I would agree that 1.6 is easily obtained.  1.7 is rare, and I do have a
long steepish hill that I use for test runs.  When boost goes away, it
seems like the WGFV is not working or something.  I will test further to
determine whether the boost comes back do to a cool-down period or an
ECU "reboot".

I should have mentioned before that the coolant temp sensor is about 10K
miles old, the check engine does not come on, and I have not consulted
VAG-COM yet.

-----Original Message-----
From: Brett Dikeman [mailto:brett at]
Sent: Friday, October 25, 2002 10:02 PM
To: Tom Mullane; 200q20v at
Subject: Re: Boost Goes Away

At 7:11 PM -0400 10/26/02, Tom Mullane wrote:

>I am having a strange issue.  Last night, a few minutes after
>accelerating hard (full boost) onto the highway, I noticed that my car
>was no longer producing anywhere near full boost.  Since it was dark, I
>decided I would take a look at it today, after work.  But this morning,
>all was well again; plenty of boost.  Good boost on the way home from
>work in the afternoon, until I again accelerated hard through gears,
>then the boost fell off again.  I stopped home, changed clothes, and
>jumped back in the car: full boost!  Anyone have any ideas?
>At rest, key on, engine off, the boost gauge reads .8 bar.  "Full"
>is 1.6 bar, usually.  I am running the IA stage III chip and have
>struggled through a few issues since chipping back a couple of months
>ago (not chip related). I have replaced the OXS, the intake temp
>plugs, and wires; I also treated the MAF and TPS with Stabilant 22a.
>How do my boost numbers sound?  In the ballpark, or am I low?  Thanks.

I've noticed 1.6 tending to be the 'easily obtained' maximum on the
display pretty often with my III+, and numbers on the gauge I had
were falling short of what others with III+ have seen.  I will get
1.8 if the acceleration is long enough, but it seems to take forever.

Curiously, I get fantastic response and power after long periods of
highway driving, two hours usually does it, but the more the better.
I have yet to figure out why, but it has been a characteristic of the
car since before I can remember.  The car just seems to hate city

Now that I have a lot of boost leaks settled, I might throw the gauge
back on and see what I get, along with an LED to show the wastegate
frequency valve action...but first, I'm going to have to replace or
repair the aux radiator :-(

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

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