Monday, September 19, 2011

HOW TO CHECK LOW RPM'S ON A MERCRUISER 8'1 HORIZON?

MY ENGINE SHOULD TURN 4,000 R.P.M.%26quot;S........WAS RUNNING GREAT AND SUDDENLY CUT TO 2600.....MY MECHANIC PUT HIS COMPUTER ON IT AND ALL LOOKED GOOD....DID COMPRESSION %26amp; FUEL PRESSURE TEST AND GOOD.....CHANGED SPARK PLUGS, FUEL FILTER AND PLUG WIRES...NOW GET 3100 RPM'S......WHAT DO YOU SUGGEST? THANKS HERBHOW TO CHECK LOW RPM'S ON A MERCRUISER 8'1 HORIZON?First, your 8.1 should turn a little higher rpms (4200-4600 WOT). Think about prop modifications. Does the engine run smooth at 3100, or does it have a stutter? Do you have a water separating filter? Make sure it is a 10 micron filter, not a 21, you may have a fuel volume problem. If the CDS scan came back clean, Your tech might try running the boat under load, and recording any sticky faults. Too many possibilities here, can you give some more info on the symptoms?HOW TO CHECK LOW RPM'S ON A MERCRUISER 8'1 HORIZON?4000 rpm's is not up to specs that engine should turn between 44 an 48 oo rpm's, have u checked the bottom ? barnacles and such, and bad fuel ?? should not have to hook a computer to ta=hat engine as you already should have one on your dash with the Horizon packageHOW TO CHECK LOW RPM'S ON A MERCRUISER 8'1 HORIZON?you need to check motor

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