Mercury Plenum Intake – 8M0099004

The Mercury Plenum Intake (Part #8M0099004) is a factory-original replacement component engineered to optimize air distribution within your Mercury marine engine. Designed with performance and reliability in mind, this plenum-intake ensures that the engine receives balanced airflow for consistent combustion, efficiency, and throttle response.

Key Features

Genuine Mercury OEM Quality – Built to meet strict Mercury Marine standards for superior engine integration

Optimized Airflow Design – Distributes intake air evenly across cylinders to maintain smooth engine performance

Durable Composite Construction – Lightweight and corrosion-resistant for long service life in harsh marine environments

Exact Fit Replacement – No modifications needed—install with confidence in compatible Mercury engines

Performance Assurance – Helps ensure proper air-to-fuel ratio, engine responsiveness, and reduced emissions

Compatibility

The Mercury Plenum Intake – 8M0099004 is compatible with a range of Mercury marine engines. To confirm fitment for your model, please consult your engine’s service manual or contact PartsVu with your engine serial number.

Ideal Use Cases

Replacing a cracked, warped, or worn intake plenum

Restoring factory air delivery performance in Mercury marine engines

Supporting clean combustion and consistent RPM operation

Maintaining engine reliability and meeting emissions standards

Why Replacing the Intake Plenum Matters

Over time, plenum-intake components can deteriorate due to heat, salt, and vibration. A compromised intake can disrupt airflow and lead to uneven combustion, reduced power, and poor fuel efficiency. Using a genuine Mercury Plenum Intake 8M0099004 ensures that your engine gets the proper airflow it needs to perform reliably on the water.

Frequently Asked Questions

What does a plenum-intake do in a Mercury engine?

It evenly distributes air to each cylinder, ensuring optimal combustion and engine performance.

How can I tell if my intake plenum needs replacement?

Common signs include rough idling, poor throttle response, visible cracks, or diagnostic trouble codes (DTCs) related to airflow.

Can I install the 8M0099004 plenum intake myself?

Yes, if you're comfortable with basic engine maintenance. Always follow Mercury’s installation guidelines or consult a marine technician for support.