insufficient air during combustion
insufficient fuel during combustion
low temperature combustion
high temperature combustion
incomplete combustion
high atmospheric temperature combustion
air fuel ratio
air temperature
air flow speed
exhaust gas volume
mixes fuel with air
promotes combustion by creating a swirling movement in the air fuel mixture
returns blow by gases from the crank case to the intake system
feeds blow by gases to the exhaust manifold
improved fuel efficiency
improved emission
improved power output
all of these
The advantage of the fuel injection system over the carburetor system is * improved fuel efficiency * improved emission * improved power output