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Marshall.

Strange whistle like noise

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Afternoon all, been on this forum a while now but not much of a poster. I own a 2004 320d

Since I bought my car it's had this sort of whistle noise coming from the engine bay everytime you put your foot down, with the windows up you can't really hear it so it's not really been on my mind. It's not until the last week where the weather's been nice I've really payed attention to it and now it's starting to bug me.

I've attached a video of the noise if anyone could shed any light? I've searched the Web etc but can't really find anything

Cheers Chris

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You talking about turbo whistle?

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Get someone to blip the throttle while you listen to where the noise comes from, should help narrow it down. Will either be a pipe split or intercooler.

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Not wanting to scaremonger, but my brother had this noise on a Megan Diesel that he used to own. He decided to keep running like it until payday because he liked the 'supercharger whine' it gave.

About a week later the turbo gave out causing the street to fill with smoke - when he turned it off the car continued to run on its own oil until he finally managed to stall it in fifth. Turned out that one of the propellers had broken inside the turbo.

Hopefully it is only a split hose as suggested, but please get it investigated quickly as if your turbo does go, and it runs up on its own oil without you being able to stall it/switch off, then you'll be looking at far bigger issues than you are now.

Sent from my SM-N9005 using Tapatalk

Edited by L4nky808

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Does it blow out a lot of black smoke when on boost? If so then it would indicate a boost leak from a damaged hose/intercooler/inlet manifold. If it doesn't then it's either a heavily coked up turbo or it's on it's way out.

INPA would be a good start to check requested v actual boost.

Edited by bungers

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There's no smoke that I can see when driving and no smoke while its stationary and I rev it. Maybe the turbo's coked up could that be a cause? I cleaned my egr 2 days ago as that was really coked up too

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the flexi pipe on front of exhaust to manifold,nearly every 330d ive heard have a slight whistle

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Took it down to a bmw specialist this morning, he didn't take any parts of just had a look over it an said it's the spindle? In the turbo just wears after a while. And Shouldn't get any worse, I'm going to have a good look over the next week and see if there's any play etc

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The spindle is the propellers in the turbo. It's strange that he would give you that advise, as they give the same noise when damaged (as in my brothers case)

Sent from my SM-N9005 using Tapatalk

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I'm going to check it out shortly, I'll look for any damage to the spindles etc. How much movement (if any) should be in the shaft?

Thanks for your help so far

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So I took the air intake pipe off, checked the spindle wich had 0 movement and all propellers seemed in good nick. On the pipe there was a smaller pipe that went below the airborne. This seemed to have oil in it, what the pipe used for?

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Looks like the recirculation valve which puts removes the unwanted air when you are off throttle. Not sure why it would have oil in mind, i don't know where the EGR routes on these or if there is a CCV plumbed in. A small amount could be normal.

I doubt that's the cause of your whistle though, unless any of the pipes weren't seated correctly.

Did you get someone to blip the throttle whilst you listen to where the noise is coming from? Could be a pin hole or something in a pipe or rad you see. Suppose you could have a smoke test done to rule it out.

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Thanks for your input, there was a small amount of oil but I'm not too worried for now. Yes got someone to blip the throttle but couldn't narrow it down. It's definitely coming from around the turbo/actuator,I've checked the pipe shown in the pic and all seems ok I also Took it to an indy and the turbo seems fine no play etc.

Going to check all around the exhaust too as I've been told it's quite common that they crack.

Want to get to the bottom of this now

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Seems to be the same the whole time, going to take it back down the indy and leave it with them Monday, it's starting to drive me mad lol. I think your right with the manifold/ flexible to be honest.

Cheers

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Just updating for anyone interested. Took the car to a indy yesterday and he seemed fairly sure it was a bearing in the turbo causing the noise. So looks like a new turbo will be ordered soon :(

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