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  1. H

    Gas in Oil, Running Rough

    My 2001 MIE 350 MAG MPI is running rough and blowing lots of light brown/white (not blue) smoke... like uncombusted fuel. I have since replaced the fuel pressure regulator, one ECT sensor, and the Ignition sensor. I switched the MAP, IAC, and TP sensors with other engine. Also note...
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    2001 350 Mecruiser Horizon Running Rich and Rough Idle

    Got the engine back up today. After installing new risers yesterday, I could not get the engine to fire... no spark. Traced it back to the ignition control module. Replaced with module on the other engine and boom... cranked right up. Sprayed some engine tuner into the intake. Also been...
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    2001 350 Mecruiser Horizon Running Rich and Rough Idle

    I have twin 2001 350 Mercruiser MPI Horizons (SN 0L399054/56). These have the upgraded fully closed cooling system due to water ingestion problems pursuit was having in the 2000-2001 models (recall). I have had the boat for two years and have solved multiple issues looking at posts from other...
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