Question

which of the following is one of the most common drawbacks of a gdi engine?

a. drop off in performance during cold weather
b. buildup of carbon on the intake valves and runners
c. cost of engine maintenance
d. chemical cleaner damage to the engine

Explanation:

In GDI (Gasoline Direct Injection) engines, fuel is injected directly into the combustion chamber. This means that the intake valves do not get cleaned by fuel (as in port - injected engines where fuel sprays over the intake valves). Over time, carbon deposits can build up on the intake valves and runners. Cold - weather performance drop is not a common inherent drawback of GDI engines. While engine maintenance costs can vary, it is not as characteristic a drawback as carbon buildup. Chemical cleaner damage is more of a user - error or improper - use issue rather than a common drawback of the GDI engine design.

Answer:

B. Buildup of carbon on the intake valves and runners