Question

technician a says that black exhaust indicates a very rich - running engine. technician b says that white exhaust can indicate coolant in the exhaust. who is correct?

○ a. technician a
○ b. technician b
○ c. both technician a and technician b
○ d. neither technician a nor technician b

Explanation:

• A rich - running engine (excess fuel) can cause black exhaust as not all fuel is burned completely.
• White exhaust can be due to coolant entering the combustion chamber (e.g., a blown head gasket) and vaporizing.

Answer:

C. Both Technician A and Technician B