cutout/stumble on an MC engine

[Peter Berrevoets]

Ah... the dreaded overboost cut-out; sort of like hitting a brick wall?

Check that the big hose to the bottom of the wastegate hasn't crumbled with
age and is leaking, preventing the wastegate from functioning properly.

If that is fine, you may have a tear in the wastegate diaphragm, I don't
know if wastegate frequency valve failure will allow for an overboost
condition as well, but maybe someone else might.

HTH

Cheers!

Peter Berrevoets
1990 200TQ
Toronto, Canada
http://frontpage.home.net/pjberr/



> >-----Original Message-----
> >From: quattro-admin at audifans.com
> >[mailto:quattro-admin at audifans.com]On
> >Behalf Of james accordino
> >Sent: Tuesday, August 07, 2001 11:26 PM
> >To: audi list
> >Subject: cutout/stumble on an MC engine
> >
> >
> >I have a slight problem that so far has never happened
> >to me.  At 3/4 to full throttle and between 3500 and
> >5000 rpm the engine will cutout for less than 1 second
> >and then recover like nothing is wrong.  Any ideas?
> >Plugs, wires, cap and rotor are all brand new stock.
> >Injectors, filter and pump are also new or nearly new.
> > It just seems to drop dead, but for less than a
> >second.  It only happens once on any hard acceleration
> >pass.  Never at an exact rpm.  Please throw some
> >suggestions my way.  BTW, I'm loving the fuel mileage.
> > It had been dropping for a while.  New injectors and
> >ignition components seem to have worked wonders.  175
> >miles to 3/4 of a tank and 500-600 per fill.
> >Indicated mileage between 25 and 31 on the highway
> >with some seriously hard driving.  Also no more 10
> >sec. crank time.  Sometimes it starts instantly, other
> >times on the second or third revolution.
> >
> >Thanks
> >Jim Accordino
> >