An exhaust analyzer that measures lambda is being discussed. Technician A says a lambda reading of 0.98 to 1.02 is considered normal. Technician B says a lambda of 1.12 indicates a lean condition. Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Lambda is a measure of the air-fuel ratio relative to the stoichiometric mixture. A lambda of 1 indicates a perfect stoichiometric mixture. Values between 0.98 and 1.02 are indeed considered normal, indicating a mixture very close to stoichiometric. A lambda greater than 1, such as 1.12, indicates more air than fuel, signifying a lean condition. Therefore, both technicians are correct.

An Exhaust Analyzer That Measures Lambda Is Being Discussed