{"product_id":"throttle-position-sensor-for-mercruiser-350-mag-replaces-oem-803148-sierra-18-7757","title":"Sierra 18-7757 Throttle Position Sensor, Flange Mount, for Mercury Racing 350\/377 V-8 Marine Engines","description":"\u003cp\u003eThe Sierra 18-7757 is a flange-mount throttle position sensor built for Mercury Racing 350 and 377 V-8 marine engines. It reads throttle plate position and sends a push-pull output signal to the engine control system, allowing the engine management to respond accurately to throttle input. The sensor uses a compact housing measuring 0.39 x 0.39 x 0.39 inches, making it a direct fit into the factory sensor location on applicable engine blocks.\u003c\/p\u003e\u003cp\u003eBuilt to the Sierra standard for marine replacement electrical components, the 18-7757 is intended as a straightforward swap for a worn, drifting, or failed throttle position sensor. A sensor that has gone out of calibration or failed outright can cause rough idle, hesitation, stalling, or inconsistent throttle response, and replacing it with a properly matched part restores accurate throttle-to-engine communication. This sensor is application-specific, so confirming the engine model and serial number range against the fitment list below is important before ordering.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-7757\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Throttle Position Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Flange Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Type:\u003c\/strong\u003e Push-Pull\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282294816\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBlack Scorpion SKI, 350 V-8, 1998-2002, serial range L005601 - M391599\u003c\/li\u003e\n\u003cli\u003eBlack Scorpion SKI, 350 V-8, 2003-2010, serial range M391600 - W698432\u003c\/li\u003e\n\u003cli\u003eScorpion 350 5.0L, 350 V-8, 2008-2010, serial range W698433 \u0026amp; UP\u003c\/li\u003e\n\u003cli\u003e377 Scorpion MCM, 377 V-8, 1999-2005, serial range L416146 - M907201\u003c\/li\u003e\n\u003cli\u003eMX 6.2L MPI, 377 V-8, 2000-2001, serial range L680003 - M299999\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-7757 throttle position sensor fit?\u003c\/strong\u003e The 18-7757 fits Black Scorpion SKI 350 V-8 engines (1998-2002 and 2003-2010), Scorpion 350 5.0L 350 V-8 engines (2008-2010), 377 Scorpion MCM 377 V-8 engines (1999-2005), and MX 6.2L MPI 377 V-8 engines (2000-2001).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this sensor?\u003c\/strong\u003e The Sierra 18-7757 measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7757 sensor weigh?\u003c\/strong\u003e It weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-7757 mounted?\u003c\/strong\u003e This sensor uses a flange mount, which bolts directly to the engine's throttle body location.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat kind of output signal does this sensor produce?\u003c\/strong\u003e The Sierra 18-7757 uses a push-pull output type to communicate throttle position to the engine control system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-7757 a genuine Sierra part?\u003c\/strong\u003e Yes, this is Sierra part number 18-7757, a marine throttle position sensor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e One Sierra 18-7757 throttle position sensor is included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-7757 fit a 2008-2010 377 Mag engine?\u003c\/strong\u003e No. The 377 Mag engine for 2008-2010 uses a different sensor number; the 18-7757 covers the Black Scorpion SKI, Scorpion 350 5.0L, 377 Scorpion MCM, and MX 6.2L MPI applications listed for this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat serial number range applies to the Black Scorpion SKI application?\u003c\/strong\u003e For 1998-2002 model years the range is L005601 - M391599, and for 2003-2010 model years the range is M391600 - W698432.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-7757 fit the MX 6.2L MPI DTS engine?\u003c\/strong\u003e No, the MX 6.2L MPI DTS application does not use the 18-7757 sensor; the 18-7757 is specified for the standard MX 6.2L MPI engine for 2000-2001.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC identifies the Sierra 18-7757?\u003c\/strong\u003e The UPC for this throttle position sensor is 808282294816.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat serial number range applies to the Scorpion 350 5.0L application?\u003c\/strong\u003e For the 2008-2010 Scorpion 350 5.0L, the 18-7757 applies from serial number W698433 and up.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988387147995,"sku":"SIE-18-7757","price":92.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-7757__31882.1722358886.500.750.jpg?v=1785188657","url":"https:\/\/www.goodvibesmarina.com\/products\/throttle-position-sensor-for-mercruiser-350-mag-replaces-oem-803148-sierra-18-7757","provider":"Good Vibes Marina","version":"1.0","type":"link"}