Fuel to Air Sensor

[Ti Kan]

Sperry, Peter  A -Syntegra MN writes:
> Do any of the 5 cylinder engines have a sensor for the fuel/air mixture?  If
> so, which ones, and is the computer then able to automatically adjust for
> the correct mixture?

For cars with CIS, it's the mechanical air flow sensor plate that controls
the basic fuel delivery, with fine tuning done via the oxygen sensor
input to the ECU, driving the frequency valve on the fuel distributor.
This is true for just about all 5 cylinder Audi gas models with fuel injection
except the 20-valve cars, which use a pulsed injection system.  On those
cars, the air flow sensor is a hot-wire mass flow sensor, and the injection
quantity is varied by changing the pulse cycle time.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
96 A4 2.8 quattro (sold but not forgotten)
-- 
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Research Laboratories, Sunnyvale, CA. USA
  ///    ti at amb.org
 //////  http://www.ibiblio.org/tkan/
///