SERVICE MANUAL NUMBER 23
MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY
CLEANING AND INSPECTION
1.
Remove and discard sealing O-ring from IAC valve. Clean sealing surfaces, pintle valve
seat, and air passage with a carburetor cleaner to remove carbon deposits, being care-
ful not to push or pull on the IAC valve pintle. Force exerted on the pintle might damage
thewormdrive.DONOTuseacleanerthatcontainstheextremelystrongsolventmethyl
ethyl ketone.
NOTE: Shiny spots on the pintle, or seat, are normal and do not indicate misalignment or
a bent pintle shaft.
2.
Inspect the entire assembly for physical damage.
INSTALLATION
IMPORTANT: If installing a new IAC valve, be sure to replace it with an identical part.
IAC valve pintle shape and diameter are designed for the specific application.
1.
Install new O-ring on IAC valve.
b
a
c
75657
a - Screw (2)
b - Idle Air Control (IAC) Valve
c - Throttle Body
2.
3.
4.
5.
Install IAC valve in throttle body using screws. Torque to 20 lb-in. (2 Nm).
Place a new gasket between throttle body and adapter.
Install the throttle body on the adapter and torque the screws to 89 lb-in. (10 Nm).
Reset IAC valve pintle position as follows:
a. Turn ignition key ON for ten seconds.
b. Turn ignition key OFF for ten seconds.
c. Restart engine and check for proper idle operation.
Index
90-861326--1
MARCH 1999
Page 5C-51
| 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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