Sorry to just jump in the discussion, but I'm experiencing my own issues with idling problems on my benz, and it uses pretty much the same design (ICU, ICV, OVP relay)...

My OVP, when I pull it out and shake it around a bit, I hear a slight rattling noise. That's probably a bad thing isn't it?

The confusing bit is that it seems to work. I pull it out of the car and there's a notable difference between starting and running with and w/o the relay. It has to be working right?

Just a sanity check, but a relay can't be "half dead" in some aspect. Right?

Thanks,

-Troy

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- - - '77 federal 280e - 222k miles
- - - '85 380se - 129k miles
- - - '07 Chevy truck
- - - '79 Datsun 280zx with '82 turbo motor
- - - Currently looking for a clean 190e with less than 160k miles.