The non lambda controlled systems used vaccum to adjust the amount fuel delivered. You'll see some people claim that you get better performance from K-Jet without the lambda stuff (most recently spotted on a Saab board). The only problem I have with K-Jet is that the thing bogs down for the first few minutes (yes.. yes.. check the CPR).

If you don't hear the frequency valve operating, first make sure it's actually connected. Then make sure the relay is connected, and that the joints on it aren't shot. I don't know if the frequency valve relay is worth resoldering or not. A new frequency valve is fairly expensive ($100), the relay looks pretty cheap at about $10. If you do a brickboard search you can find pictures of where the relay and valve are located (the relay is on the LH fender).

**BUT** if you've measured a constant reading from the O2 sensor (you used an analog meter, right?). The frequency valve operates based on input from the O2 sensor. Basically you should not see a stable reading, the voltage should be fluctuating within a set range once it's warmed up. If it's not fluctuating you won't hear the freq. valve buzz off and on.

Moral of the story: change the oxygen sensor (and verify that its wiring is okay) before you mess with more expensive (and generally longer lived) parts.

- alex

'85 244 Turbo | ~144.9k miles