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Quicksilver 864856A1 MAP Sensor for MerCruiser GM V6 & V8 EFI Engines 350/377/454/502

Manufacturer

Quicksilver

<h3>About Quicksilver</h3><p><strong>Quicksilver</strong> has been a cornerstone of the marine industry since 1950, delivering the parts, accessories, and engine care products that keep boats running at their best. A division of Brunswick Corporation and closely aligned with Mercury Marine, Quicksilver has grown into one of the most trusted names on the water — offering more than 40,000 parts across a broad range of product lines designed for both the weekend boater and the seasoned marine professional.</p><p>What sets Quicksilver apart is its unique position as the premier supplier of Mercury Marine Original Equipment replacement parts, while simultaneously serving owners of nearly every major marine engine brand. Whether your vessel is powered by Mercury, Mariner, Honda, Yamaha, Evinrude/Johnson, or Suzuki, Quicksilver produces components engineered to fit and perform like the originals. This cross-brand compatibility, combined with factory-level quality standards, is why boaters worldwide have made Quicksilver their go-to source for maintenance and repair.</p><p>The Quicksilver catalog spans the full spectrum of marine maintenance needs. At its core are <a href="/7456-quicksilver-fuel-pump-6244">fuel pumps</a> and complete fuel pump and carburetor kit solutions that keep fuel delivery systems operating reliably under demanding on-water conditions. For those needing a broader fuel system overhaul, Quicksilver&apos;s lineup of <a href="/7456-quicksilver-fuel-pumps-201310">fuel pumps</a> covers outboard and sterndrive applications alike. Above the waterline, few components are as performance-critical as the prop, and Quicksilver&apos;s extensive range of <a href="/200673-propellers-quicksilver-7456">propellers</a> — from aluminum to stainless steel — gives boaters the ability to tune their vessel&apos;s performance to their exact needs. Rounding out the drivetrain, Quicksilver also offers precision-engineered <a href="/7456-quicksilver-drives-gearcases-transoms-200346">drives, gearcases, and transom components</a> that are essential for maintaining the mechanical heart of sterndrive and inboard systems.</p><p>Quicksilver products undergo rigorous testing and engineering validation — the result of decades of R&amp;D conducted alongside Mercury Marine&apos;s own engineering teams. The brand&apos;s commitment to quality means that each part meets or exceeds OEM specifications, giving do-it-yourself boaters and marine technicians alike the confidence that a Quicksilver repair will hold up season after season. From freshwater lakes to demanding saltwater environments, Quicksilver is built for wherever your adventures take you.</p>

Part Number

864856A 1
09/15/2036 6:07 AM
Sale Price

$239.91

2 left at this price

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Usually delivered within 2 days

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Product Details

The Quicksilver 864856A1 Manifold Absolute Pressure (MAP) Sensor is a genuine OEM replacement sensor engineered for MerCruiser GM V6 and V8 electronic fuel-injected marine engines. The MAP sensor is a critical component of the engine management system, continuously measuring intake manifold pressure and relaying that data to the ECM to optimize fuel delivery, ignition timing, and overall engine performance.

Key Features:

  • Genuine OEM Mercury Marine / Quicksilver factory part
  • Designed for MerCruiser MCM/MIE GM V6 and V8 EFI engines (350, 377, 454 & 502 CID)
  • Built to perform in harsh marine environments including extreme temperatures, vibration, and thermal and mechanical shock
  • Provides precise manifold absolute pressure measurements for accurate fuel and ignition control
  • Direct OEM replacement — no modifications required
  • Backed by Mercury Marine's 1-year factory warranty against defects and workmanship

Cross-Reference Part Numbers:

  • Mercury / Quicksilver: 864856A1, 805217A1, 48004, 10-64074, 56214
  • Volvo Penta / OMC: 3850396
  • Sierra: 18-7684 (S18-7684)

This MAP sensor is a direct-fit, factory-spec replacement that restores proper EFI engine management function, helping maintain peak performance and fuel efficiency in your MerCruiser-powered vessel.

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