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Thread: 1994 200hp mercury efi
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04-17-2016, 08:35 PM #1New Member
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1994 200hp mercury efi
It would run good when I first started it then in 5 min start running bad then I could wait for 15min it would run great all day next day I cranked it on muffs and it ran good for 5 min that started running bad I shut it off and started pulling plugs and they were milky looking worst on bottom cylinder
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04-18-2016, 06:59 AM #2
milky sounds like some water is getting in the combustion chamber....could be coming in with fuel or leaking in from a crank in block coolant passges, I doubt a head gasket would do this as it would probably inject air into the coolant.
Go Time
2003XS GS 225 Promax/ 260 / 280
26 Regulator twin 250 EFI
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04-18-2016, 08:13 AM #3Screaming And Flying!
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look at the exhaust divider plate on the back of the motor its the main culprit maybe base gasket but not likely
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04-18-2016, 07:56 PM #4New Member
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05-06-2016, 07:46 PM #5New Member
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Well I replace head gasket and exhaust plate gasket and its still doing the same thang I'm guessing power head and exhaust gasket next only thing it runs bad when I first crank it and check the plug there milkey looking not all of them just 3 or 4 I can run it till it gets warmed up and it runs good and the plugs aren't milkey looking
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