Fuel inlet from fuel rail
Electrical connector
Fuel spray tip
| Fuel injectors. Style will vary depending on engine size and model year |
The fuel injector is a solenoid operated device, controlled by the PCM, that
meters pressurized fuel to a single engine cylinder. The PCM energizes the
high-impedance (12.0 ohms) injector solenoid to open a normally closed ball
valve. This allows fuel to flow into the top of the injector, past the ball valve,
and through a director plate at the injector outlet. The director plate has four
machined holes that control the fuel flow, generating a spray of finely
atomized fuel at the injector tip. Fuel from the injector tip is directed at the
intake valve, causing the intake valve to become further atomized and
vaporized before entering the combustion chamber. An injector stuck partly
open can cause a loss of pressure after engine shutdown. Consequently,
long cranking times would be noticed on some engines.
meters pressurized fuel to a single engine cylinder. The PCM energizes the
high-impedance (12.0 ohms) injector solenoid to open a normally closed ball
valve. This allows fuel to flow into the top of the injector, past the ball valve,
and through a director plate at the injector outlet. The director plate has four
machined holes that control the fuel flow, generating a spray of finely
atomized fuel at the injector tip. Fuel from the injector tip is directed at the
intake valve, causing the intake valve to become further atomized and
vaporized before entering the combustion chamber. An injector stuck partly
open can cause a loss of pressure after engine shutdown. Consequently,
long cranking times would be noticed on some engines.
Warning Lights
