Got a new OVP relay and installed it with no luck. The one in it looks really new (genuine MB part), so now I have a spare OVP relay . I rechecked the voltage at the throttle linkage microswitch with ignition on and it checked out right at 12V (I had read zero in an earlier test, which is what led me to buy the new OVP. I must have made a mistake last time I checked it.). I'm starting to suspect the ECU is bad. I don't think it really controls anything other than the AF ratio. Will the car run with a dead ECU?