Leganza CDX L4-2.2L DOHC D-TEC MFI (1999)
Fuel Injector: Description and Operation
FUEL INJECTOR
The multiport fuel injection (MFI) assembly is a solenoid operated device controlled by the engine control module (ECM) that meters pressurized fuel to
a single engine cylinder. The ECM energizes the fuel injector or solenoid to a normally closed ball or pintle valve. This allows fuel to flow into the top
of the injector, past the ball or pintle valve, and through a recessed flow director plate at the injector outlet.
The director plate has six machined holes that control the fuel flow, generating a conical spray pattern of finely atomized fuel at the injector tip. Fuel
from the tip is directed at the intake valve, causing it to become further atomized and vaporized before entering the combustion chamber. A fuel injector
which is stuck partially open would cause a loss of fuel pressure after the engine is shut down. Also, an extended crank time would be noticed on some
engines. Dieseling could also occur because some fuel could be delivered to the engine after the ignition is turned off.
