I seem to be hearing a intermittent howling sound from my car. It sounds comparable to when you blow into a bottle doesn't anyone else come across this? It doesn't sound like it's coming from the engine bay itself, and can really only be heard when the hood is done or you take a step back.
Checked the intake system and it's not that either

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Do you have a fire station nearby and do your neighbors have any Great Danes? I'm sorry I couldn't help myself!

The intake tube that goes to the airbox, check that and report back. How about your exhaust? That's not near the engine bay.

 

Checked it. It has not turned into a hissing. Loss of boost during driving.

And right now the car starts stall within in 5 secs and hisses

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Have you checked your diverter valve? This is really strange, out of the ordinary.

 

Wow I feel stupid just found it. The Nm charge pipe separated from the throttle body, that would make sense why the a/f reading was weird. What's weirder no cel popped up.

Anyway That could of been the cause of that howling I'll have to wait and see.

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No cell is very strange, I mean talk about an intake air leak!

 

glad it was resolved, may want to consider updating the original post for future searchers

 

unfortunately its still doing it. I'm not picking anything up on the obii. Perhaps it's something to do with the intercooler that was the last piece to go on recently.

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You just put an intercooler on? There are caps that go in the crash bumpers tubes to prevent air from entering and making noises like you describe. Sometimes these fallout when people install intercoolers. It's something to look at.

 

Wouldn't that only happen then when the cars in motion?.

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Yeah, you would think you'd have to be driving.

What year is your car? And have you pulled out the divertor valve? I read that you could get a noise like this when transitioning between neg and positive boost.

 

early 07 mcs. the only time I've noticed it is when it's in idle; in park, so it would still be under vacuum.

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Update*

I
Just happened to be listening to a friends audi q5 turbo- it makes kind of like a a howling like the mini- so I guess it must be normal.

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