jpitman2

My car has no O2 sensor or frequency valve, I know what they look like. The spare lead plugged into the side of the fuel distributor.
The accumulator is usually housed in front of the right rear wheel - can with two diameters(~50 and 75mm), maybe 100-120mm long, with two steel lines goin in/out. Its job is to hold a minimum pressure in the line forward to prevent vapour lock in higher temps. Not sure if all models ran them, but CIS certainly seems to use them.
jp 83 Euro S AT 50k
jp

Dennis Wilson

JP,

Remembered our earlier discussion on this after I posted the reply. Still believe it is a frequency valve since the O2 sensor was an option on the 80 and later euros. Leaving it plugged probably puts it into a default mode and leaving it unplugged will cause an abnormal control pressure.

Dennis

jpitman2

Dennis, you mean there is something in distributor that modifies mixture when part warmed, similar to freq valve? Does sort of ring a bell.....
jp

Dennis Wilson

If you can hear the valve clicking while running it is a frequency valve. Not sure how it would be controlled if no O2 sensor.

OR

The valve may be a safety fuel cutoff switch, like installed on the early 924's. Since the euro's didn't have the tach signal to the fuel pump relay, a tach signal was sent to a cutoff valve on the fuel distributor. This stopped the fuel pump if the engine stopped running as in the case of an accident.

Dennis