Warm the motor up and run it for 15 seconds at the rpm that it misses at (5 seconds for a high rpm mis)then shut it off without moving the throttle. Pull all the spark plugs as quickly as possible noting what cylinder they belong to. Look at the electrode on each plug, noting coloration and wetness. 1 should be slightly different. If 1 plug is drier than the others, its a fuel issue on that cylinder. If 1 is wetter than the others, it's an ignition issue on that cylinder. A lighter color is a fuel issue, a darker color is ignition.
Plugs should be "read" as the first step in troubleshooting a misfire. The method above works most of the time. The motor should be under load, so it needs to be ran in the water or in a tank. Hopes this helps.
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08-09-2016, 05:46 PM
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