MULTI-PORT FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
SERVICE MANUAL NUMBER 23
FUEL INJECTORS
TheEFIinjectorassemblyisasolenoid-operateddevice,controlledbytheECM,thatmeters
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
canresultinlongcrankingtimes.Dieselingordelayedshutoffcanalsooccur,becausesome
fuel might be delivered to the engine after the ignition is turned OFF.
s
r
q
p
o
n
m
l
k
j
i
g
h
f
d
e
b
c
72970
a
MEFI 1 Injector Shown
a - Needle Valve
b - Nozzle
c - Cap
d - O-Ring
e - Valve Stopper
f - Core
g - O-Ring
h - Spring
i - Housing
j - Solenoid Coil
k - Tape
l - Bobbin
m - O-Ring
n - Inner Collar
o - Sleeve
p - Terminal
q - Connector
r - Filter
s - O-Ring
Page 5B-36
90-861326--1 MARCH 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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