VW Bosch injection

[Bill Lewis]

VW has used several injection systems over the years:

D-Jetronic, 1968-197?  This system uses manifold pressure and an all 
analog electronic control box.  I think it was first used on 1968 VW 
Type 3.  Also used on Porsche 914, Saab, Volvo, and who knows what else.

L-Jetronic, 1975-  This system uses an air flow meter (flapper box) and 
a hybrid analog/digital control box.  Available with and w/o an oxygen 
sensor.  I think it was first used on 1974 Porsche 914 1.8.  Very common 
on BMW, etc.  Used on VW Bug from 1975 and late Bus / Vanagon.

Motronic, This is an all digital control unit, using either an air flow 
meter or a mass air sensor.  I think it was first used on BMW but shows 
up on just about all European makes.  With and and w/o oxygen sensor and 
knock sensors.  Used by VW on the VR6.

K-Jetronic, 1973 into the '90s.  Commonly called CIS.  This started out 
as a purely mechanical continuous flow system.  First used in 1973 
Porsche 911T.  VW picked it up for the Rabbit.  Seen on many European 
makes.  In 1982 it became K-Jetronic Lambda, which incorporated an 
oxygen sensor, a control unit, and a duty cycle solenoid valve to modify 
the original mechanical system.  About 1985, KE-Jetronic, the duty cycle 
valve was replaced by a voice coil actuator and a more complicated 
control unit.  Added digital ignition control at the same time.

Digifant is a VW invention that's kind of a cross between L-Jetronic and 
Motronic.  Found in things like 1990 Golf and Jetta.

Bill