K-Jetronic with lambda oscillations

[Roy Browning]

You wrote: 
>
>Hello, i'm new to the mailing list therefore please excuse me if i 
make a
>question which has been already treated in the past.
>
>I have a ferrari308QV which runs with a K-Jetronic with lambda fuel
>injection system. the problem i notice is that when the lambda is 
connected
>(with the computer in closed loop) the air/fuel mixture is oscillating
>resulting in a corresponding oscillation of the engine speed.
>
>at first i though that the sensor was gone. changed the sensor: 
nothing
>changes.
>
>measuring the voltage at the sensor i see that it jumps between lean 
and
>rich rapidly with a peiod of ~1s. the frequency valve correspondingly
>follows. the problem goes away when i disconnect the sensor and the
>computer goes in open-loop automatically.
>
>one of the problems is that i have no real technical book that 
describes
>the controller employed by the system. i can only assume that it is a 
PI
>controller but i do not know is the controller is completely digital 
or if
>there's an analog part as well.
>
>now the questions:
>
>-does anybody know what may be faulty?
>-any bosch technical literature on the K-Jetronic computer? if yes 
where
>can i find it.
>-is it possible to change the control gains in the K-Jetronic?
>
>I appreciate any response . regards.
>
>Pietro
>
>
>Pietro Barabaschi
>
>ITER-San Diego JWS
>11025 N.Torrey Pines Rd.- LA JOLLA-CA 92037
>USA
>[Tel:(1)(619)622-5156]
>[Fax:(1)(619)452-8163]
>
>
>
Pietro,
  Bosch publishes a fuel injection book sold by any good book store. It 
covers all bosch FI systems.

Roy Browning