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Seek to understand,^Value
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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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ooooh- a pop quiz!

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?

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

intake DISA valve

heater valve for the dual HVAC system

VANOS solenoid/ VANOS adjustment unit

hose to CCV from valve cover

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

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

that would be the high side.
 

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Seek to understand,^Value
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Discussion Starter · #12 ·
ooooh- a pop quiz!
Thanks Mark,
I appreciate the help. What I'm doing is getting an annotated photo ready, for newbies and oldies alike, with all the visible parts labeled.

That way, anyone who opens their hood would know what everything is!

Thank you for taking the time and energy to help me in that endeavor!
 

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Seek to understand,^Value
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Discussion Starter · #16 ·
I wonder what the air filter looks like?
Here is a picture of the old engine-air filter and the new filter side by side.

The old one looked OK but I replaced it anyway.

It won't rain here for the next 10 months and I take the bimmer for a drive over the mountains at least once a week, so, there is a lot of dust in the mountain roads.

Do you guys actually "wash" the engine? I've never done that as I'm too afraid I'll wash the oil out of things that need grease and electrical components that aren't supposed to get soaked.

 

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I clean mine two to three times a year, I've done it on all my cars and my wife's as well. I use a generous amount of Simple Green from a pump spray bottle, a soft paint brush for stubborn spots and a stiffer brush for really stubborn spots (like around the power steering cap and bracket) and a gentle spray from a hose to wash the grime/dirt/grease away, top and bottom. I will dry what I can with a towel or rag then drive the car until the engine bay warms up enough to dry the remaining water. Sometimes I will "condition" the plastic and rubbery parts with a protectant like Armorall. Be sure to cover your power steering reservoir cap with a plastic bag to prevent water from entering thru the small weep hole before spraying anything! You may need a few paper towels to soak up the water that will accumulate in the wells on top of the struts, too.
 

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I clean mine two to three times a year, I've done it on all my cars and my wife's as well. I use a generous amount of Simple Green from a pump spray bottle, a soft paint brush for stubborn spots and a stiffer brush for really stubborn spots (like around the power steering cap and bracket) and a gentle spray from a hose to wash the grime/dirt/grease away, top and bottom. I will dry what I can with a towel or rag then drive the car until the engine bay warms up enough to dry the remaining water. Sometimes I will "condition" the plastic and rubbery parts with a protectant like Armorall. Be sure to cover your power steering reservoir cap with a plastic bag to prevent water from entering thru the small weep hole before spraying anything! You may need a few paper towels to soak up the water that will accumulate in the wells on top of the struts, too.
Armor All contains silicon. Silicon is deathly to the O2 sensors. Not worth using that stuff and having to worry about it being sucked in somewhere into the airstream going into the engine.
 

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Armor All contains silicon. Silicon is deathly to the O2 sensors. Not worth using that stuff and having to worry about it being sucked in somewhere into the airstream going into the engine.
Good advice, I'm sure. Silicone is a double edged sword and not appropriate in every situation. My mistake for generalizing.

Following your caution, it makes sense for me to recommend the use of Meguiar's Silcone Free dressing or a similar product. Works the same on rubber, plastic and vinyl without the danger (and it won't discolor tires, intake ducts, etc. if used often, as Armor All would). :)
 
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