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Recently my engine has been running real rich, requiring leaning the mixture to get it to smooth out. The engine also will not shut off when the mixture is pulled full lean. I have to use the key. The fuel pressure is right where it should be. The fuel line AD was just done in December, so I'm wondering if it could be anything related to that. My servo was pulled this weekend so it can be sent in to be checked, and rebuilt if needed. It's sounding like a bad o-ring or diaphram in the servo, letting too much fuel through.

Have any of you had your servo go bad? Any other thoughts of what could cause this?

Hey, Buddy... just don't lean that thing at altitude!

I leaned it slightly on one flight, and it brought the fuel flow back down to where it was supposed to be, as well as made the engine run better. But I kept a close watch on the cylinder head temps. In preparation for the next flight I found that I had to lean it out 1/2 way, so it was getting worse. No real decision there, except don't fly it.

I sent the servo and flow divider to a shop today for repair or overhaul, as needed. Sure hope it doesn't need the o/h, as that is pretty pricey.