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Hi Guys,

I have a 1980SC which has strarted to run like a bag of poop. One moment it was fine, and then all of a sudden it appered to have lost about 50% of its' power, and started to backfire/sputter. I temporarily manually richened it up the mixture and it is somewhat drivable (barely). From doing some looking around, I noticed that the frequency valve is not making its' buzzing/vibrating noise it always used to make. The Haynes manual sez to test the fv and measure 2 to 3 ohms, mine measures 4.3 Ohms. I checked the relay under the seat beside the lambda unit, and verified the relay is ok (applied power to the coil and measured that the outlined points made contact). I checked that the connector on the fv is getting about 12v. It appears that the lambda unit is getting power too from the connector. My question is, could by lambda unit be bad? How can I test it? Does the 4.3 Ohm measured value indicate that my fv is pooched?

Please help if you can.

.Steven
1980 911SC