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    Did I find the overheating problem?

    Thanks to everyone who gave there advice. I decided to pull the exhaust plate to see if it was cracked and after I took it off, no cracks, I notice the inner tube was sitting at an angle, took a long screwdriver and yes it moved. Pulled the power head and midsection and sure enough the inner...
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    Clunking noise

    Every time I raise my Merc 150EFI I hear a clunk, and when I lower it it does it again. I’m baffled. Just changed the water pump and all looks good there. Any ideas. Thank you for all the help. By the way I am having a overheating problem, would the clunk have anything to do with it ? New...
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    Merc 150pro xs to a 200 hp.

    Is it possible to convert a Merc 150 to a 200? What would I have to change? Throttle body and PCM ? Thank you for your time.
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    Plugs fouling

    I have a 2003 Mercury 150EFI and have had problems with plug fouling issues. This is what I’ve done, all these parts are new. Coils, crank sensor, both fuel pumps, reeds, had injectors cleaned and checked and still foul out the plugs on port side in less than 15 min. It used to be all the plugs...
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    No power fuel pump

    Hello to whoever reads this. I have a question about the main power relay and the other main power relay that mounts under the ECM. ITS A 2003 Mercury 150efi. I removed and had cleaned the injectors, after putting back together fired it up and it sounded great, after about ten seconds it died. I...
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