Cold Start Injector: Description and Operation

Cold Start Injector:

NOTE: Only certain models are equipped with a cold start injector.

PURPOSE
At cold start, a separate cold start injector ensures that enough evaporated fuel reaches the combustion chamber for improved cold starting performance.

LOCATION
The injector is located in the intake manifold.

CONSTRUCTION
The cold start injector consists of a fuel filter (screen) and a solenoid valve. The solenoid valve opens when energized and closes when without current.


OPERATION
When the cold start injector is in operation, additional fuel is injected into the intake manifold. It is controlled by the fuel injection ECU. The ECU energizes the injector when the coolant temperature (temperature sensor signal) is below -15°C (5°F) and when engine RPM (RPM signal from ignition ECU) is below 900.

SIGNAL
The signal sent from the fuel injection ECU is an ON/OFF voltage.