Leaderboard

That's the throttle damper, it plugs into the idle control valve (part #1) and stops the throttle snapping shut instantly when you take your foot off the gas. The little nubbin that connects to pipe #4 is solid - it doesn't connect in, it's just to support it mechanically. Pipe #4 is joined to the outer edge of the inlet elbow (the plastic or rubber bit in the top-left of the engine bay that connects the airbox to the throttle body), and once the idle control valve and damper have done their thing pipe #3 connects the air feed into the throttle body to allow it more or less air depending on how the idle's doing :) It's a pretty overengineered system and doesn't work very well, which is why the VR6 idle is so lumpy! They ditched it on the later OBD2 engines fitted to the Golf VR6es and did it all electronically :) Stone