ooooh- a pop quiz!

bluebee said:

Over time, I've come to know (by necessity) almost every large item in the M54 engine bay ... but some items still are unknown to me ...

What is this engine part?

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emissions valve, opens at cold start to allow secondary air pump to pump air into the exhaust to light the cats.

bluebee said:

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intake DISA valve

bluebee said:

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heater valve for the dual HVAC system

bluebee said:

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VANOS solenoid/ VANOS adjustment unit

bluebee said:

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hose to CCV from valve cover

bluebee said:

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that is simply an electrical connector you have circled, unless my eyes are missing something

bluebee said:

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The "box" with all the brown wires is a common chassis ground for several things.

bluebee said:

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that would be the high side.

glad to help!

I wipe mine down with a damp cloth, that is about it. I don't do that often either. I've never been one to detail an engine, I just don't have the time or energy to devote to it.

Part at left is just a grounding block, or a nice way to ground a lot of wires as far as I know. Note all the wires going to it are brown. Brown = chassis ground.

The circled part on the right is the expansion tank bleeder screw.