The Lambda and Idle are two different systems. You cannot remove the lambda and successfully get an accurate air-fuel ratio across the RPM band without going to another injection setup. Bosch K-Jetronic has to have the lambda to work.Sorry Harold - that's not true. There are loads of applications of the K-Jet system which don't use a lambda system. Just look at all the different types of CPR on John Hervey's page to get an idea of the number of different variations. My new engine's being built without lambda (using a Volvo metering head) and a Renault 30 distributor to compensate. You are right that the lambda and idlespeed systems are two seperate systems.