FUEL INJECTORS
IDLE AIR CONTROL (IAC) VALVE
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 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.
Thedirectorplatehassixmachinedholesthatcontrol
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.
72800
a
b
c
d
73773
a - Fuel Injector
b - Fuel Filter
c - Seal Ring
d - Fuel Meter Body
IAC Valve Air Flow Diagram
FUEL DAMPER
The fuel damper acts as an equalization device to re-
duce the pressure spikes caused by the fuel injec-
tors.
73766
a
Throttle Body Injection Shown
a - Fuel Damper
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-25
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
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