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Author Topic:   What could this be?
guido19 posted 08-11-2005 10:36 PM ET (US)   Profile for guido19   Send Email to guido19  
What would cause the engine on a 200 hp hpdi 2002 Yamaha to run rich? My plugs foul up and my engine runs rough if I cruise at low (2000) rpm. Could it be the O2 sensor???
macfam posted 08-12-2005 08:29 AM ET (US)     Profile for macfam  Send Email to macfam     
I think you're on the right track.

Every spring when I have the boatyard bottom paint my boat, I ask the Yamaha mechanic to "check my 02 senser" on my 1999 OX66.
Every year he asks, "how were the plugs last time you checked them?"
I always say, "They were pretty clean".
He then says, If the plugs wern't fouled, then the O2 senser is fine".

I say, "check it anyway". (Lord knows he he ever does)

My brother's 2000 200 hpdi has really clean plugs at the end of the season.
Have that O2 senser checked.

John Parry posted 08-16-2005 07:45 PM ET (US)     Profile for John Parry    
Have you guy's had any other preventive type maintenance done to your 200 hpdi's?
I have the same engine and I am wondering about the rubber drive belt,should it get changed?
I have about 170 hours on the engine.
Were your engines blowing "blue" smoke?(is that why you thought they were running too rich?)

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