Sierra 18-5116-1 Ignition Distributor Sensor for GM V-8 Thunderbolt IV

The Sierra 18-5116-1 is a precision-engineered ignition distributor sensor designed specifically for marine applications with GM V-8 engines equipped with Thunderbolt IV ignition systems. This sensor plays a critical role in your ignition system by monitoring distributor position and sending timing signals to the ignition module, ensuring optimal engine performance and reliable starting.

Key Features:

• Direct replacement for GM V-8 marine engines with Thunderbolt IV ignition systems
• Features nut-style electrical connectors for secure, corrosion-resistant connections
• Manufactured to OEM specifications for reliable fit and function
• Durable construction designed to withstand harsh marine environments
• Restores proper ignition timing and engine performance

This sensor is an essential component for maintaining your marine ignition system. When the original sensor fails, symptoms can include rough idling, misfiring, difficulty starting, or complete ignition failure. Sierra Marine parts are trusted by boaters and mechanics worldwide for quality and reliability in replacement engine components.