[s-cars] 94 S4 hesitated

[LL - NY]

Sam, I concur with Dave, you've a boost leak. Time to check (besides the hoses
Dave mentioned) perhaps the bypass valve and hoses to and from the turbo also.
But, as Dave mentioned, the Michelin Man hose (the one down low) is
most suspect due to the accumulation of oil down low. And thanks for
the heads up on the moisture trap Dave, forgot about that one.

LL - NY

On 6/11/05, Dave Forgie <forgied at direct.ca> wrote:
> Sam:  Sounds like your New Zealand car has the digital boost gauge our
> North American cars only got on the 92 spec cars. The gauge is absolute,
> i.e 1 Bar basically = one atmosphere = no boost.  So you have lost
> boost.  There are two hoses that you need to know about:
> 
> 1. Underneath the black plastic cover on the fire wall (held on by two
> plastic Dzus fasteners (turn them 90 deg only), is a little boost line
> going into what looks like a black film can.  The OEM clamp gets week an
> it lets the hose come off the nipple on the can (moisture trap).
> Replace the clamp with a small gear clamp.
> 
> 2. The "Michelin Man" hose between the crossover pipe and the
> intercooler inlet (you need to take off the belly pan to find this
> one).  Oil accumulates in the ridges of the hose and rots the rubber
> from the inside.  You can't necessarily see the crack in the hose but it
> probably is there.  Check and replace this hose.  Many people switch to
> a silicon rubber hose from Samco.
> 
> Good luck.  Kiss a sheep for me. ;>)
> 
> Dave F.
> 
> 
> 
> 
> 
> 
> Hi
> 94 S4 6 speed
> I was driving hard(ish) up a hill the other day when suddenly a massive
> hesitation occurred, like someone had turned the key off, then on, then
> off, then on. This has repeated itself since from about 1.2 bar up on
> the digital boost/vac readout. Mid throttle driving is fine. All other
> gauges etc read OK.
> I drove it again today, initially it did the same thing, then the boost
> readout went flat at 1.0 bar and the hesitation appears gone. The boost
> reads 1.0 bar no matter what speed/throttle position, whether full boot
> up hill or full overrun downhill or at idle. Power seems normal,
> everything drives smoothly.
> All other readouts are as normal (fuel economy etc readouts)
> What gives gurus?
> Sam Clarkson
> 
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