Technician A says that a vacuum leak can cause a rough idle or ...

[newbem]

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

[courtney_bruh]

Answer to Question 1

A

Answer to Question 2

D