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  1. R

    Merc 3.0 tuneup - fast idle

    Hello, On a 1998 Merc 3.0 - I changed the spark plugs from AC Delco MR43T (came with boat) to MR43LTS (engine spec) also replaced the Distributer cap and rotor. The boat fired right up and after a brief warmup I pulled the trrottle to neutral idle. Previously the engine idled at 750-800 rpm...
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    Engine misfiring and rough idle

    Hello, I got a 1998 Maxum - Mercruiser 3.0 a couple of months ago. I took it out last month and the engine ran great all day. Last week I took it out for the second time and had no problems for 2 hours, then it made a knocking sound and lost rpm while crusing (from 3200 to 2800). It made it the...
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    No ignition switch response

    Hello, I was doing some maintenance on my Mercruiser 3.0. I changed the fuel filter and the sparkplugs. I expected the engine to be difficult to start at first and cranked it over many times without success. After reexamining, I noticed that one spark plug wire was not connected. I connected it...
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