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2006 Malibu 23 LSV 8.1L running rich

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Where is the engine coolant sensor located on the 8.1? Anyone have a link to the sensor? 

Boat is running very rich. After surfing the bottom of the boards are black also has a very strong fuel smell when running. It has new plugs this year. 

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Not exactly sure on the 8.1 but it could be the fuel pressure regulator or the map sensor causing it.

easy to check the pressure regulator with a pressure gauge on the fuel rail.

Edited by wakesonthesnake
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