Mercury MerCruiser TMAP Sensor Assembly 8M0087834
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Mercury / MerCruiser Quicksilver TMAP Sensor Assembly ā 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.
Key Specifications
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Part Number: 8M0087834
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Component Type: TMAP sensor (MAP + intake air temperature sensor)
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OEM Brand: Mercury Marine / Quicksilver
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Typical MSRP: about $110ā$130 USD depending on supplier
Compatible Engines
Commonly used on MerCruiser MPI engines with ECM 555, including:
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4.3L MPI V6
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5.0L MPI V8
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5.7L / 350 MAG MPI
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377 MAG MPI
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383 MAG Stroker
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MX 6.2L MPI
These engines are typically found in Alpha and Bravo sterndrive boats as well as inboard installations.
Function
The TMAP sensor performs two key measurements inside the intake manifold:
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Manifold Absolute Pressure (MAP)
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Determines engine load and air density
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Intake Air Temperature (IAT)
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Helps adjust fuel mixture and ignition timing
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The ECM uses this information to:
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Optimize the air-fuel ratio
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Improve engine performance and fuel efficiency
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Maintain smooth idle and throttle response
Common Symptoms of a Failed TMAP Sensor
A faulty sensor can cause:
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Rough idle
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Poor acceleration
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Increased fuel consumption
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Engine warning codes
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Hard starting or stalling
Replacing the sensor restores accurate engine management readings.
ā ļø 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
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3ā4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us ā and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity ā and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.