[Stage5Lurker]

I am not an expert and I noticed this noise after I removed my headlight for routine maintenance. It seems to be coming from the area below the alternator, which I believe is the a/c compressor? Then it also seems to come from the turbo area? I checked the motor to the HVAC system, still good. It isn't the cooling fan. And certainly not the exhaust cooling off.
I have been thru the forums and found troubleshooting advice, but nothing that is comparable to what I am showing. Anyone with some insight, please relieve me of my ignorance to this matter!

[u2b]<iframe width="560" height="315" src="https://www.youtube.com/embed/lyAI-254occ" frameborder="0" allowfullscreen></iframe>[/u2b]

[Efthreeoh]

Diagnosing noises over the internet is impossible. The component under the alternator is the power steering pump. The AC compressor is on the right-side of the engine (right-side is the passenger side of the car). You say you have a 328i, which for the E90, is not a turbo engine, so your car doesn't have a "turbo area". And I'm not sure what routine maintenance requires headlight removal. From what you have written here, you seem to have no level of knowledge about your car to even help by guessing, because it will just get more confusing to you.

Maybe you should just take it to a BMW repair shop and get a professional diagnosis.

[Stage5Lurker]

Originally Posted by Efthreeoh

Diagnosing noises over the internet is impossible. The component under the alternator is the power steering pump. The AC compressor is on the right-side of the engine (right-side is the passenger side of the car). You say you have a 328i, which for the E90, is not a turbo engine, so your car doesn't have a "turbo area". And I'm not sure what routine maintenance requires headlight removal. From what you have written here, you seem to have no level of knowledge about your car to even help by guessing, because it will just get more confusing to you.

Maybe you should just take it to a BMW repair shop and get a professional diagnosis.

As I said...I am no expert. I read the post again looking for the 328 and how I thought the 328, (that I do not have) had a turbo. Now, as I said previously, I am no expert. I am almost positive that the video I posted is titled "N55 tapping noise after shutdown." I understand that you are a certified BMW tech and even probably design some, if not most, of these engineering marvels But!! Like I have said before! I am no expert...My vehicle (LCI e92 335i msport) the one with the spinny thing with the other spinny thing inside and the whooshing sound when you hit the pedal. This car...and I know you are the expert...has 1 spinny thing but has the power of two separate spinny things as the N54 engine has. I didn't mean to offend you by my lack of knowledge on the BMW. Being an engineer, like myself, don't you think reading is a fundamental part of becoming en engineer?

[Efthreeoh]

Originally Posted by Swiftshiftsith

As I said...I am no expert. I read the post again looking for the 328 and how I thought the 328, (that I do not have) had a turbo. Now, as I said previously, I am no expert. I am almost positive that the video I posted is titled "N55 tapping noise after shutdown." I understand that you are a certified BMW tech and even probably design some, if not most, of these engineering marvels But!! Like I have said before! I am no expert...My vehicle (LCI e92 335i msport) the one with the spinny thing with the other spinny thing inside and the whooshing sound when you hit the pedal. This car...and I know you are the expert...has 1 spinny thing but has the power of two separate spinny things as the N54 engine has. I didn't mean to offend you by my lack of knowledge on the BMW. Being an engineer, like myself, don't you think reading is a fundamental part of becoming en engineer?

Yup, I agree you are no expert. I've worked with hundreds of engineers over the years that know shit about cars. I didn't look at the video since even though my computer has decent speakers, they are still computer speakers and it's a video from the internet, so listening to a bunch of ambient noise through small low-dynamic range speakers is pretty pointless (as I stated in my response).

And nowhere in your post did you explicitly say you had a 335i, and your avitar says 328i sedan. Also you you provided what is now apparently superfluous information about removing the headlight for routine maintenance (good engineers leave out information that is unnecessary to consider when discussing a problem as it leads to confusion...). So it seems like you are an engineer and can't discern one underhood component from another.

So like I said before with good reason, take it to a professional and have them diagnose it.