FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
SERVICE MANUAL NUMBER 24
Page 5D-32
90-861327 OCTOBER 1999
FUEL INJECTORS
The EFI injector assembly is a solenoid-operated device, controlled by the ECM, that meters
pressurized fuel to a single engine cylinder. The ECM grounds the injector solenoid, which
opens a pintle valve, allowing fuel to flow past the pintle valve. The injector tip has holes that
control the fuel flow, generating a conical spray pattern of finely atomized fuel at the injector
tip. Fuel is directed at the intake valve, causing it to become further atomized and vaporized
before entering the combustion chamber.
An injector that is stuck partly open will cause loss of pressure after engine shutdown. This
can result in long cranking times. Dieseling can also occur, because some fuel might be de-
livered to the engine after the ignition is turned OFF.
72970
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
MEFI 1 Injector Shown
a -
Nozzle
b -
Cap
c -
O-Ring
d -
Valve Stopper
e -
Core
f -
O-Ring
g -
Spring
h -
Housing
i -
Solenoid Coil
j -
Tape
k -
Bobbin
l -
O-Ring
m -
Inner Collar
n -
Sleeve
o -
Terminal
p -
Connector
q -
Filter
r -
O-Ring
Index