I have a bad misfire on my '89 Merc 200 Black Max<br />So far we have tried to fix it by replacing:<br />Plugs and leads.<br />Two coils on the 2 cyls.which appear to be having the problem.<br />Changed the stator.<br />Changed the thermostats (to raise the operating temp)<br />Checked all running voltages etc.on coils/power packs.All ok<br />Engine appears to be oiling all 6 plugs but 2 are worse and not burning correctly.<br />Sometimes the misfire appears to be tied in with the low oil warning alarm sounding especially from start up.<br />The engine has on occasion cleared itself after running at trolling rpm (2000) for about 15 mins then ran ok for the rest of the day until next time out.<br />I,m wondering could it be the small non return valve which allows the oil to be injected into the fuel line letting too much oil mix with the fuel?<br />Any ideas would be appreciated.<br />Rich Neal (New Zealand)
