Description
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
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Part Number: 863829 (Mercury format 35-863829)
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Component Type: IAC air filter / muffler
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Function: Filters and muffles intake air to the Idle Air Control valve
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OEM Brand: Mercury Marine / Quicksilver
Compatible Engines
Commonly used on MerCruiser Multi-Port Injection (MPI) engines, including:
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4.3L MPI V6
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5.0L MPI V8
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5.7L / 350 MAG MPI
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MX 6.2L MPI
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383 MAG Stroker
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496 MAG
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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:
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Allows clean air to enter the IAC valve
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Reduces intake noise from the valve operation
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Prevents dirt or debris from entering the idle air circuit
If this filter becomes clogged or missing, the engine may experience:
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Rough idle
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Idle speed fluctuations
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Increased intake noise near the throttle body.
Superseded / Replacement Number
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35-863829 → superseded by 35-8M0188224 (newer Mercury replacement)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)






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