Quicksilver 8M6003194 Knock Sensor for MerCruiser V-6 & V-8 MPI Engines with ECM 555

The Quicksilver 8M6003194 Knock Sensor is a genuine OEM replacement part engineered for MerCruiser inboard engines. Designed specifically for MCM V-6 and V-8 (305, 350, and 496 CID) MPI engines equipped with ECM 555, this sensor plays a critical role in protecting your engine from detonation damage.

The knock sensor continuously monitors engine vibrations, detecting detonation events in real time. It communicates directly with the ECM 555, allowing the engine control module to automatically adjust ignition timing — helping preserve internal engine components, optimize fuel efficiency, and maintain smooth operation under demanding marine conditions.

Key Features:

• Genuine OEM Quicksilver/Mercury Marine part — not aftermarket
• Designed for MCM V-6 and V-8 (305, 350 & 496 CID) MPI engines with ECM 555
• Monitors engine vibrations to detect knock and detonation in real time
• Interfaces with ECM 555 to enable automatic ignition timing correction
• Helps protect internal engine components from knock-related wear
• Built to withstand the harsh marine operating environment
• Supersedes OEM part number: 878187

A faulty knock sensor can result in reduced power output, poor fuel economy, and long-term engine damage if left uncorrected. Replacing it with the genuine Quicksilver 8M6003194 ensures accurate sensor readings and a precise OEM fit.