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    4.3 mercuiser overheating

    Cruising @ 30 mph ran at 175 degrees. Apparently should be 160. Has aftermarket closed cooling system with heat exchanger . Exhaust risers still raw water cooled. When slowing down from cruise to 5 mph alarm would come on - a touch of throttle would turn alarm off.Replaced impeller, (looked fine...
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    4.3 mercruiser should i change thermostat ?

    Currently runs at 175 degrees , specs say it should be 160 degrees. Overheat alarm goes off when I slow from 30 to 5 mph but turns off when it goes a smidge under 175. Any special tips on changing the thermostat would be appreciated.
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    4.3 mercuiser starts, stalls in 30 seconds

    Starts right back up again, usually have to pump throttle to get it going, runs for 30-40 seconds then stalls again, repeat. I have been trying to figure this out for a while. Started by replacing oil pressure safety switch(mounts on oil pressure sending unit & cuts power to fuel pump if...
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    does anyone know operating temp for 4.3 mercruiser ?

    1993 lx 4 bbl carb - also does anyone know horsepower?
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    4.3 mercruiser ignition control module -HELP

    Does anyone know how often these fail ? If they do what are the results. I have gone thru thunderbolt ignition checklist & still have no spark. The last thing to do is replace ICM. @ $400.00 not sure i'm ready to part with money if this is not it.
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    Advice please ! 4.3 mercruiser no spark

    Thats how it started , run for 25 seconds, stall , then start right back up. Now no start at all.So- pulled fuel tank line, strainer @ bottom is clean, replaced fuel filter,replaced oil pressure safety switch checked power to fuel pump & visual pump test, gas squirting into carb on throttle...
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