The mixture adjustment screw on the AFM only effects the mixture at
idle. If everything is set correctly, the O2 sensor has the ultimate
control. With the Digijet injection, idle speed and mixture setting is
somewhat critical. Setting the mixture richer than what the O2 sensor is
trying to maintain will cause idle surging. This is due to the injector
cut out which occurs at 1300 rpm when the throttle is closed. When the
engine goes over 1330 rpm with a closed throttle the injectors are
turned off. When the engine goes below 13300 rpm, the injectors turn
back on with the O@ sensor disabled for 30 crank revolutions. If the
mixture is rich enough during this bypass to bring the engine over 1300
RPM, we start the idle surge again.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of Smola, Tony
Sent: Thursday, January 03, 2002 2:01 AM
To: vanagon@GERRY.VANAGON.COM
Subject: CO adjustment, can this add power if enriched to the upper end
of the scale?

Or would gas consumption be too high....and would the car run too
hot?....or
would the added richness help to keep head temps down.

Malibu Tony    85' Westy   1.9L WBX      6 degrees BTDC\
                78 911 sc