quattro Digest, Vol 9, Issue 71-low boost 5KQ

[Larry C Leung]

David,

Even better is to check www.SJMAutotechnik.com in the area of
"Secrets of High Boost" for info on how to diagnose a MAC 11 - 14
equipped turbo cars. 

As for the Michelin Man hose (ribbed hose running from the intercooler,
radiator looking thing in front of the engine compartment) to throttle
body,
they often do fail. As Kneal says, the best way to test is to take the
hose
off (can't do this right with it on the car, trust us) and examine the
hose, 
pleat by pleat. There are metal rings between each pleat, so it's hard to
see.
Hold the hose up to the light and flex, looking for light in the pleats.
Finally,
as Knealle says, do the accordian test. 

In a pinch, what I have found that works is to use old bike inner tubes, 
hose clamps and duct tape to wrap the hose. I don't like using too much
duct tape, I'd hate for the adhesive (remember, this is a hot
environment)
to get into my intake tract. 

This is one of those parts that you may want to keep a spare around. A 
number of sources are availible. Check out www.thepartsconnection.com, 
and other sources (unfortunately, last I checked, the parts suppliers
part
of www.audifans.com seems to be down. I'm sure other listers can offer
other
sources that my feeble mind can't recall. If you can't find one fast, I
do have 
a spare new one I can sell.

HTH!

LL - NY

> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sun, 25 Jul 2004 22:03:21 -0400
> From: Kneale Brownson <knotnook at traverse.com>
> Subject: Re: low boost 5KQ
> To: Ti Kan <ti at amb.org>, david.vickers at us.army.mil
> Cc: quattro at audifans.com
> Message-ID: <4.1.20040725215951.00b92840 at traverse.com>
> Content-Type: text/plain; charset="us-ascii"
> 
> At 06:01 PM 7/25/2004 -0700, Ti Kan wrote:
> >david.vickers at us.army.mil writes:
> >> I am new to the list. I just purchased a 1987 5000CS Quattro. It 
> has a
> >> Intended Acceleration Chip, 2Bennet Turbo and Intercooler, Koni
> >> Coilovers. I have had the car for about one weak. It drove great 
> with
> >> 15psi of boost, and then suddenly it would not make over 5psi. 
> The car
> >> still runs great up until 5psi; then, it cuts out. This is my 
> first
> >> turbo. Any suggestions on where to start
> >
> >Probably air leak somewhere in the intake tract.  The first place
> >I'd look is the "michelin man" hose between the throttle body and 
> the
> >intercooler.
> >
> And you want to do more than look.  The best test for a leaking MM 
> hose is
> to take it off and squeeze it between your palms so you can tell 
> whether it
> holds air.  They frequently crack inside the folds.  Aren't the ones 
> on the
> 5k packaged with some metal coils around the outside?  Makes 
> checking for
> leaks even more difficult.  Other hoses can look perfect on top and 
> have
> holes in the bottoms.  So feel/squeeze all the hoses. Any that feel 
> gummy
> on the bottom may be leak sources too. 
> 
> 
> ------------------------------