Technician A says that a vacuum leak can cause a rough idle or stalling. Technician B says that spark knock (ping or detonation) is often caused by a too rich air-fuel mixture or an excessively low engine operating temperature. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Question 2
The chemical abbreviation CO stands for ________ and is formed during the combustion process inside the engine.
A) Carbon origin B) Carbon dioxide C) Carbon oxygen D) Carbon monoxide
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