ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-2390-823225--1 1096
FUEL INJECTORS
The injector assembly is a solenoid operated device,
controlled by the ECM, that meters pressurized fuel
to the intake manifold. The ECM energizes the injec-
tor solenoid, which opens a ball valve, allowing fuel
to flow past the ball valve, and through a recessed
flow director plate.
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 is directed
at the throttle, causing it to become further atomized
before entering the intake manifold.
73773
a
b
c
d
a - Fuel Injector
b - Fuel Filter
c - Seal Ring
d - Fuel Meter Body
FUEL PRESSURE REGULATOR
(VST EQUIPPED ONLY)
The pressure regulator is a diaphragm-operated
relief valve with fuel pump pressure on one side, and
regulator spring pressure and intake manifold
vacuum on the other. The regulator’s function is to
maintain a constant pressure differential across the
injectors at all times. The pressure regulator
compensates for engine load by increasing fuel
pressure as engine vacuum drops.
73766
a
a - Fuel Pressure Regulator
FUEL DAMPER (COOL FUEL SYSTEM ONLY)
The fuel damper acts as an equalization device to re-
duce the pressure spikes caused by the fuel injec-
tors.
73766
a
a - Fuel Damper
IDLE AIR CONTROL (IAC) VALVE
The purpose of the IAC valve assembly is to control
engine idle speed, while preventing stalls due to
changes in engine load. The IAC valve, mounted in
the throttle body, controls bypass air around the
throttle valves.
72800
IAC Valve Air Flow Diagram
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