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MAP Sensor 881731 – Fits MerCruiser MX 6.2/7.4 & 496 MAG
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How to Match This Part
This aftermarket manifold absolute pressure (MAP) sensor replaces MerCruiser / Mercury 881731, along with related numbers 861249A1 and 8M0054726 (current supersession 8M0186195). The ECM uses manifold absolute pressure to meter fuel on MerCruiser MPI sterndrive and inboard engines.
Match this part in this order:
1. OEM number on the sensor or in your parts list — 881731, 861249A1, 8M0054726, or 8M0186195 (also Sierra 18-7550 / 18-7660)
2. Engine serial number on the MerCruiser identification plate (block, flame-arrestor cover, or near the ignition coil bracket)
3. Engine family against the Compatible Engine Models table below
Identify the form from the product images: black plastic housing with molded side mounting tabs, a top pressure port with a multi-rib orange seal, and an integrated electrical connector shell marked PBT-GF30. This listing is not the earlier MerCruiser 864856A1 / 805217A1 MAP family — do not order this sensor if your OEM number is 864856A1.
Part Number Cross-Reference
Use this table to confirm equivalent OEM and aftermarket numbers in the 881731 / 861249A1 MAP sensor chain.
| Type | Brand | Part Number | Notes |
|---|---|---|---|
| OEM | Mercury / MerCruiser | 881731 | Primary listing number (manifold air pressure sensor) |
| OEM | Mercury / MerCruiser | 861249A1 | Earlier MAP assembly number in the same chain |
| OEM | Mercury / MerCruiser | 8M0054726 | Later Mercury number superseding 881731 / 861249A1 |
| OEM | Mercury / MerCruiser | 8M0186195 | Current Mercury supersession of 881731 |
| Aftermarket | Sierra | 18-7550 | Aftermarket cross for 861249A1 applications |
| Aftermarket | Sierra | 18-7660 | Aftermarket replacement for 881731 / 8M0054726 (ECM 555 MPI) |
| Aftermarket | Mallory | 9-33604 | Aftermarket replacement for MerCruiser 881731 |
This is an aftermarket part manufactured by JLM Marine and is not sold as a genuine Mercury Marine or MerCruiser component.
Compatible Engine Models
This MAP sensor covers MerCruiser applications that call for 881731 / 861249A1 / 8M0054726. Confirm your OEM number and serial plate before ordering. For MerCruiser owners: Mercury / MerCruiser Serial Number Guide and Mercury Parts Diagrams.
| Engine Family | CID / Liters | Notes |
|---|---|---|
| MerCruiser MCM / MIE GM V-6 & V-8 MPI | 305 / 350 cid | When parts list calls for 861249A1 (1998 & newer) |
| MerCruiser MX 6.2L MPI | 6.2L MPI | Quicksilver fitment for 861249A1 (1998 & newer) |
| MerCruiser 7.4L MPI | 7.4L MPI | Quicksilver fitment for 861249A1 (1998 & newer) |
| MerCruiser 496 MAG / 496 MAG H.O. | 496 cid / 8.1L | Where-used for 881731; ECM 555 MPI applications |
| MerCruiser 8.1L Inboard / Towsport | 8.1L | Where-used for 881731 (base and H.O. serial groups) |
Not every MerCruiser EFI uses this sensor. If your parts list shows 864856A1 or 805217A1, order that MAP family instead.
Technical Specifications
| Specification | Value |
|---|---|
| Part type | Manifold absolute pressure (MAP) sensor |
| Primary OEM number | 881731 |
| Related / supersession numbers | 861249A1, 8M0054726, 8M0186195 |
| Housing material | PBT-GF30 glass-fiber reinforced thermoplastic (marked on connector) |
| Function | Intake manifold absolute pressure signal for MPI fuel control |
| Approx. shipping size | 3.00 in L × 1.00 in W × 2.38 in H |
| Approx. weight | 0.06 lb |
Installation Guide
1
Stop the engine, disconnect the negative battery cable, and allow the intake area to cool before working on the manifold.
2
Locate the MAP sensor on the intake / plenum. Unplug the harness connector and note wire routing and any vacuum path at the port.
3
Release the mounting tabs or fasteners and lift the old sensor off. Inspect the manifold port, seal surface, and connector pins for oil, corrosion, or damage.
4
Seat the new sensor squarely so the sealed pressure port enters the manifold without cocking, reconnect the harness until it latches, restore battery power, and clear any related diagnostic codes after confirming a leak-free install.
Warning: Work with the ignition off. A vacuum leak at the MAP port can cause rich/lean running or driveability faults — verify the orange seal and port condition before restart.
Troubleshooting & FAQ
Will this fix hesitation or a MAP-related check-engine light?
Only if the sensor itself failed. Check the manifold port seal, connector terminals, and related vacuum path before replacing. Match the OEM number on your old sensor first.
Is 864856A1 the same part?
No. 864856A1 / 805217A1 is a different MerCruiser MAP family used on many earlier GM V6/V8 EFI applications. This listing is for the 881731 / 861249A1 / 8M0054726 chain (MX 6.2L MPI, 7.4L MPI, 496 MAG / 8.1L, and related MPI).
Does Sierra 18-7660 cross to this sensor?
Yes. Sierra 18-7660 replaces MerCruiser 881731 / 8M0054726 on ECM 555 MPI engines. Sierra 18-7550 is the catalog cross commonly listed against 861249A1. Mallory 9-33604 is the matching Mallory number for 881731.
Why Choose JLM MARINE?
- Precision Fit: MAP sensor matched to MerCruiser 881731 / 861249A1 / 8M0054726 applications listed above.
- Quality Control: Each batch is inspected for dimensional consistency and workmanship.
- Direct from Manufacturer: New-production aftermarket marine sensors engineered for MerCruiser MPI fuel control.
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