frequency valve buzzing?
 

Does an '84 W126 500 V8 have a frequency valve? If so, where is it and why doesn't it buzz? According to Steve, the valve looks like a electric injector on the left side of the motor. All I see with that description is what I believe to be the cold start valve near the distributor. And I don't hear any buzzing. The cd rom makes no mention of the frequency valve either. Any ideas?
Woody