3B Distributor Issue. Maybe more?

[Kent McLean]

Leon wrote:
> I am a proud owner of a nice tan '91 Audi 200 Quattro Turbo 
> with the 20V 3B engine. 

Congratulations on the acquisition.  Once it is sorted, you should 
really enjoy it.

> It ran strong till the day I was sliding around a curve and the engine
> stalled on me. After this, the engine wouldn't rev faster then  
> 2800-3000rpm when engaged in any gear, but would rev up all the 
> way in  neutral. 

This one sounds like a vacuum leak.  My wild guess is that old
engine mounts allowed the engine to move, stretching the hoses
around, and causing a vacuum leak.  Look at the big, fat "Michelin
Man" hose; check it for cracks.

> I pulled the following codes at a shop: Throttle Position Sensor
> (already replaced), Oxygen sensor (was disconnected), Hall
> Sensor/Engine speed sensor (problem here!). 

Codes have a tendency to cascade.  One bad sensor will cause
others to throw codes, even though they are fine. Replace the 
one bad sensor, the others behave themselves. Work through
the fault list one at a time.

> Now I have no spark - I believe I either fried the ignition module 
> or the hall sensor completely gave out. 

Hmm.  The Hall sensor, or rather the wires into the Hall sensor,
are a weak point.  I thought someone (Lee Levitt?) was looking
into using a Volvo Hall sensor as a replacement. The archives
may have more.  For a used distributor, try chris at force5auto.com.

-- 
Kent McLean
'94 100 S Avant, "Moody"
'89 200 TQ, "Bad Puppy" up in smoke