Re: OXS Duty Cycle

[steveb@newkla.kla.com (Steven Buchholz)]

>    What is the exact procedure to set  the OXS duty cycle using a dwell meter
> and a the frequency valve. This has been referenced in the past but I don't
> recall anyone giving exact details. My car is a 5000CSTQ.  Also, the CO
> adjustment screw has been tampered with before, and I can't tell if the screw is
> completely destroyed or if it is just the plug for the screw that is referenced
> in the Bentley. The hole is about a quarter-inch deep from flush at the screw.
> If the adjustment screw is destroyed what are my options?
> 
It sounds to me that someone has drilled out the plug that prevents access
to the screw that allows the CO adjustment screw to be accessed.  The actual
screw is a 3mm hex screw that is part of the airflow plate mechanism and
establishes the amount of fuel metered for a given amount of airflow.  I
don't think your screw is damaged (from what you have said above).  Although
the hole that is left after the plug is drilled out does not create a path
for unmetered air to enter the system, any air that flows through the hole
is not filtered.  Older cars such as the 1978 Audi Fox have a rubber plug
that can be easily removed.  You might want to look into getting one of 
these for your car.  Sorry, I don't have a part number in front of me.

Steve Buchholz
s_buchho@kla.com
San Jose, CA (USA)