Description

Mercury / MerCruiser Quicksilver TMAP Sensor Assembly — 8M0087834

The Mercury Quicksilver 8M0087834 TMAP Sensor Assembly is a genuine OEM temperature and manifold absolute pressure (TMAP) sensor used on many MerCruiser MPI gasoline engines. It measures both intake manifold pressure and intake air temperature, sending real-time data to the engine control module (ECM) to optimize fuel injection and ignition timing.

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Key Specifications

• Part Number: 8M0087834

• Component Type: TMAP sensor (MAP + intake air temperature sensor)

• OEM Brand: Mercury Marine / Quicksilver

• Typical MSRP: about $110–$130 USD depending on supplier

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Compatible Engines

Commonly used on MerCruiser MPI engines with ECM 555, including:

• 4.3L MPI V6

• 5.0L MPI V8

• 5.7L / 350 MAG MPI

• 377 MAG MPI

• 383 MAG Stroker

• MX 6.2L MPI

These engines are typically found in Alpha and Bravo sterndrive boats as well as inboard installations.

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Function

The TMAP sensor performs two key measurements inside the intake manifold:

1. Manifold Absolute Pressure (MAP)

   • Determines engine load and air density

2. Intake Air Temperature (IAT)

   • Helps adjust fuel mixture and ignition timing

The ECM uses this information to:

• Optimize the air-fuel ratio

• Improve engine performance and fuel efficiency

• Maintain smooth idle and throttle response

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Common Symptoms of a Failed TMAP Sensor

A faulty sensor can cause:

• Rough idle

• Poor acceleration

• Increased fuel consumption

• Engine warning codes

• Hard starting or stalling

Replacing the sensor restores accurate engine management readings.

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Fitment Tip:
Always verify compatibility using the engine serial number. Many MPI engines look identical but use different sensor calibrations depending on the ECM generation.

Shipping:

OEM parts ship same or next day for fast Canada wide shipping.

Technical Specifications:

• Type: Temperature/Manifold Absolute Pressure (TMAP) sensor assembly
• Compatible with: Mercury MerCruiser marine engines
• Part Number: 8M0087834