929 V6-3.0L DOHC (1993)
Fuel Injector: Description and Operation
Fuel Injector (Sectioned View)
PURPOSE
PCME controlled injectors permit precise fuel metering based on sensor input and operating conditions.
LOCATION
On fuel rails between cylinder heads, at base of intake manifold.
OPERATION
Injectors are electrically operated solenoid valves that open when energized. They get battery power from the main relay when the engine is
cranking or running, and are energized when the PCME completes the circuit to ground. Injection timing and duration are determined by the
PCME.
CONSTRUCTION
Injectors are constructed of materials to resist corrosion. They consist of a fuel inlet with filter screen, an electric solenoid and connector, and a
pintle valve and nozzle. Injectors are installed in the fuel rail so that the nozzles protrude slightly into the manifold. They are sealed by O-rings and
held in place by covers fastened to the fuel rail with screws.