[s-cars] Hesitation on boost, 95.5 S6

[Joseph Pizzimenti]

Check intercooler hoses for rips.  Pressure test would
be best.

Joe

--- mswanson at sonitrol.net wrote:
> On my recently aquired S6, the car stubles and bucks
> badly when on boost. 
> The feeling is similar to hitting the rev limiter.
> 
> Gear doesn't seem to matter nor does throttle
> position (IE it doesn't only
> happen at WOT).  I put the car in 5th at low speed
> and matted the throttle
> and did not get any bucking from the car which leads
> me to believe it is
> boost related.
> 
> A quick visual inspection of the engine bay shows
> nothing obvious.  Hoses
> all look fine, etc.  I have a suspision that the
> problem is fuel related,
> since shortly after filling up with a fresh tank of
> 93 (the car was down
> to about 1/4 tank prior to the fillup) the car ran
> fine for about 10
> minutes, including a full boost run through the
> gears to merge onto the
> highway.  Several miles down the road I went to pass
> a car and the
> symptoms started up again.
> 
> Other than the short period after the fillup the car
> seemed to always be
> exhibiting the problem during the ride from CT to NY
> and back.  If I kept
> my foot out of heavy throttle it would cruise just
> fine with no roughness
> or stumbling at all from the motor.
> 
> Given the symptoms I'm thinking perhaps clogged fuel
> pump or fuel filter. 
> Any fuel pump problems such as this prone to these
> cars (which is mounted
> in-tank, correct?)?
> 
> Any input is appreciated.  It appears I'll be out of
> 'Lurk Mode' now :)
> 
> 
> -Marc-
> 95.5 S6 Avant
> 87 4ktq
> 88 90q
> 
> 
> 
> _______________________________________________
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