Question

19 multiple choice 1 point
what is the advantage of port injection over direct injection?
port injection offers better catalyst heating
port injection offers better fuel economy
port injection ensures intake valves are constantly cleaned
port injection allows for higher boost pressure with lower octane fuel.

Explanation:

Port injection sprays fuel into the intake port. As the fuel travels through the intake port and valve, it helps clean deposits on the intake valve. Direct injection sprays fuel directly into the combustion chamber, so the intake valve doesn't get cleaned by fuel in the same way as port injection.

Answer:

port injection ensures intake valves are constantly cleaned