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I am not familiar with all the workings of the frequency valve. My engine does not have the Lambda addition. From what I understand of it the frequency valve simply changes the mixter to help pass smog (read leans out at idle).
The large diaphragm is the decel valve. The function of that unit is to bypass air around the throttle body during close throttle events allowing the engine to slowly idle down instead of very rappidly doing so which may overshoot and cause the engine to stumble. This unit tends to "hang" the idle when it malfunctions.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
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