@massmike
Here you can see what a poor lambda reading looks like and what Dave and I are referring to:
The amplitude is high, which can cause surging when the amplitude/reading remains at a high level for too long.
And here is how it should look:
Lower amplitude during oscillation = lower duty cycle amplitude = fewer low chamber pressure changes (in the fuel distributor) required via the frequency valve.
@Dave
The fuel control pressure is almost not affected by the flow in the frequency valve; the valve regulates the system pressure in the lower chambers of the fuel distributor. The higher the pressure in the lower chambers pushing upward against the diaphragm, the less the inlets above the membrane open toward the lines leading to the injection valves.
