Accumulator - CO Sensor for an 81 rocco

[ccarpen at earthlink.net (Cris Carpenter)]

A US-market 81 would have an O2 sensor (not CO), but unplugging it would 
only have an impact on driveability if the base CO setting was way off to 
begin with. An 81 would have a simple lambda feedback system, so there 
should be a little electric frequency valve near the fuel distributor which 
you can hear buzzing when the engine is running. When the O2 sensor is 
there and the system is fully functional, the computer varies the buzz rate 
of the frequency valve based on readings from the O2 sensor. With the O2 
sensor unplugged, the buzz rate is fixed, so the system behaves and is 
adjusted like a pre-lambda car. If the frequency valve is unplugged or does 
not work (not buzzing), that would definitely have an impact on 
driveability. If it is working, you can see if the base CO setting is off 
by adjusting it using a long small allen wrench through the little hole in 
the top of the fuel distributor housing between the fuel distributor and 
the big intake boot. Make changes in small increments and see what happens: 
clockwise for richer and counter-clockwise for leaner. Make sure timing and 
idle are right first.
Cris

At 03:12 PM 5/3/2005, you wrote:
>Message: 4
>Date: Tue, 03 May 2005 15:40:14 -0400
>From: "Edward Effinger" <Eeffinger@conestogac.on.ca>
>Subject: Accumulator - CO Sensor for an 81 rocco
>To: <scirocco-l@scirocco.org>
>Message-ID: <s2779b77.008@CS24.conestogac.on.ca>
>Content-Type: text/plain; charset=US-ASCII
>
>Hi.
>My 81 S is an American car and I was wondering if they came
>with a CO sensor.
>
>If so, mine went missing when the header was installed.
>
>Does anyone know if this causes any driveablitiy issues, such
>as pulsing while idling/driving?
>
>Thanks
>Ed
>'81 S