IAC / Intake Air Control Solenoid Valve for Mercury & Mariner Outboards

Marine-grade aftermarket IAC / idle air control solenoid valve for selected Mercury and Mariner EFI 4-stroke outboards.

Designed to replace Mercury 877805T.

Fitment

Fits selected Mercury / Mariner EFI 4-stroke applications including:

40 HP EFI
50 HP EFI
60 HP EFI

The 877805T solenoid valve family is also catalogued for selected 30 HP EFI applications.

Please check the original part number and engine serial number before ordering.

Replaces Mercury Part Number

877805T
877805T1 – searchable/reference format where catalogued

Additional Cross References

K5T48471
K005T48471

Suzuki Cross References

18117-84380
18117-84380-000

Johnson / Evinrude Cross Reference

5031431

Product Features

IAC / Idle Air Control Solenoid Valve
Intake air control valve
Mercury / Mariner applications
Selected 40 / 50 / 60 HP EFI
Selected 30 HP EFI applications also use this valve
4 Stroke
2-pin electrical connection
Marine-grade aftermarket replacement
New in box

What's Included

1 × IAC / Solenoid Valve

⚠️ Important Compatibility Warning

This valve does NOT fit every Mercury / Mariner 30–60 HP outboard.

Mercury used different fuel and air-control components depending on the engine generation and serial number.

Before ordering, please check:

Original part number
Engine horsepower
Engine model
Complete serial number
Electrical connector

If the part looks the same as yours, this does not always mean it is the correct part for your outboard.

If unsure, send SSI Marine your engine horsepower + complete serial number and we will help check compatibility.

Buyer Responsibility

It is the buyer's responsibility to confirm compatibility before purchasing.

OEM part numbers are used for identification and reference purposes only.

Correct diagnosis is recommended before replacing EFI components, as wiring, sensors, fuel-system or other engine-management faults can produce similar symptoms.

Why Buy From SSI Marine?

Marine-grade aftermarket & OEM-spec parts
Workshop-tested products
More than 10 years supplying outboard parts
Same-day dispatch before 1 PM Monday–Friday
Royal Mail Tracked 24
UK stock
Collection from Leigh, Greater Manchester
Technical support from experienced outboard specialists

40 HP 50 HP 60 HP Mercury Mariner Outboard EFI IAC Solenoid Valve 877805T