Mercury MerCruiser IAC Filter 863829

Mercury / MerCruiser Quicksilver IAC Filter 863829

The Mercury Quicksilver 863829 (also listed as 35-863829) is a genuine OEM Idle Air Control (IAC) filter / muffler used on many MerCruiser MPI engines. It installs on the Idle Air Control valve and acts as a small intake filter and noise muffler for the air entering the IAC system.

Key Specifications

• Part Number: 863829 (Mercury format 35-863829)

• Component Type: IAC air filter / muffler

• Function: Filters and muffles intake air to the Idle Air Control valve

• OEM Brand: Mercury Marine / Quicksilver

Compatible Engines

Commonly used on MerCruiser Multi-Port Injection (MPI) engines, including:

• 4.3L MPI V6

• 5.0L MPI V8

• 5.7L / 350 MAG MPI

• MX 6.2L MPI

• 383 MAG Stroker

• 496 MAG

• 8.1L V8 inboard engines

These engines use an Idle Air Control valve to regulate idle speed by controlling bypass air around the throttle plate.

Function

The IAC filter:

• Allows clean air to enter the IAC valve

• Reduces intake noise from the valve operation

• Prevents dirt or debris from entering the idle air circuit

If this filter becomes clogged or missing, the engine may experience:

• Rough idle

• Idle speed fluctuations

• Increased intake noise near the throttle body.

Superseded / Replacement Number

• 35-863829 superseded by 35-8M0188224 (newer Mercury replacement)

Fitment Tip:
Always confirm compatibility using the engine serial number, since some MerCruiser engines use different IAC valve and filter configurations depending on the MPI system version.

Shipping:

OEM parts ship same or next day for fast Canada wide shipping.

Technical Specifications:

• Type: IAC (Idle Air Control) filter
• Compatible with: Mercury MerCruiser marine engines
• Part Number: 863829
• Also known as: 8M0188224
• Quantity: Sold individually (2 required per application)