[QUOTE]Originally posted by WANT '71 280SEL
[B]what is the lambda?
We, in North America refer to this as Air/Fuel ratio.
Perfect combustion ( what the cars computer tries to achieve ), is when you feed 14.7 lbs of air, combined with 1 lb of fuel into the engine.
In Europe they call it Lambda.
Lambda 1.0 = A/F ratio of 14.7
A leaner Air/Fuel mixture would show as Lambda, let's say 1.03 = Air/Fuel ratio of, let's say 15.5
The other way around, for rich A/F could be Lambda 0.98 = A/F ratio of
These are rough examples, but I hope you understand " Lambda " a little better now.