Auxiliary air valve

Air supply relay

Thermo time switch

Oxygen sensor

Indicate coolant temperature

Indicate engine RPM

Indictae fuel level

Indicate oil pressure

Increased thermal efficiency

Increased mechanical efficiency

Better starting and acceleration

Effective fuel distribution achived

Provide additional fuel during starting

Provide positive starting

Intake manifold

Determine timing and sequence of fuel injection

Engine hard to start - Hot

Engine cranks but will not start

Pressure regulator

Engine produce abnormal noise