[s-cars] Subject: Re: No Boost

[calvinlc at earthlink.net]

I have had a similar behavior when the bypass valve went out as well.  Check
to make sure your bypass valve is in good shape.  You should check for a
leak between the small vacuum hose on the top and either of the other two
ports.  This can be done with a vacuum pump, as it should hold vacuum, or
you can simply try and suck through the small hose.  If you can it has a
leak.
--Calvin


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of chris chambers
Sent: Saturday, July 12, 2008 4:22 PM
To: Tom Winter; s-car-list at audifans.com
Cc: sirslurpee2003 at yahoo.com
Subject: Re: [s-cars] Subject: Re: No Boost


You can also hit the "boost cut out" or expereience s hut off because
of what the ECU believes is an overboost situation with a bad  MAF or
an MAF with dirty connections.

But if you were expereiencing this In my experience it feels like the
car shuts off for a quick moment, not simply a lack of boost.

For a lack of boost I'd check the boost line to the ECU where it comes
off the T at the back of the engine. At that point it's rubber and
may be cracked or broken causing the ECU to get the boost signal
partially/momentarialy.

I'd also recommend pressure testing your boost hoses/system and look
for any bad hoses (not just the samcos), there are other hoses that
carry boost/vacuum that can fail.

Is the MAF/turbo hose in one piece, I had mine fall apart on me.

HTH
Good luck
Chris


--- Tom Winter <tom at freeskier.com> wrote:

>
>
>
> On 7/12/08 1:00 PM, " Jake Gaty" wrote:
>
> > In reply to everyone, My car is chipped (Intended Acceleration
> stage 3+) and
> has a full set of red Samco hoses. I checked for a standard intake
> leak and
> didn't have any luck in that department. I didn't really suspect a
> turbo
> problem, but I pulled off the intake boot and i did feel?previously
> unfelt
> levels?of shaft play in the turbo
>
> Jake - it's not uncommon to have a bit of play in a turbo, and if you
> had a
> bad turbo (others here with more knowledge will chime in), I'd expect
> your
> car would be smoking out the tailpipe and burning oil.
>
> Given that the car is chipped, and that you were able to re-start the
> car
> and have it drive fine, I can't help but think if you are somehow
> hitting
> the boost cut-out level. IA Stage 3+ will pull pretty hard, I'd
> think. Your
> issue sounds a lot like me hitting boost cut out in an IA Stage 1
> 5000 tqa I
> used to own.
>
> There are a lot of things that might cause you to hit boost cut out
> prematurely. You've started checking hoses, and I'd give all of the
> hoses,
> not just the intake and Samcos a very close look, again. Feel for
> hidden
> splits that can't be seen, only found by touch.
>
> I'm sure the list will also have additional good ideas.
>
> Tom '95 S6 Avant (MTM Stage 1, RS2 goodies)
>
>
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