High pitched scream under boost

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A4sportMrT

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Hello all, there is a high pitch scream when i accelerate under boost, It's not there when I rev stationary.

the only thing I've done, is I was going to swap out standard air box for the K&N induction kit but I couldn't get the ****** out after taking off hoses, undoing screws, wiggling it etc but that's another story I'll be wanting help with.

anyway could it be that I've not put something back right? Or have I damaged something? *please do not say anything Turbo related*

the car still drives fine it just has an annoying squeal when accelerating hard.

thanks in advance :)
 
Could be, I will try to identify and check hoses tomorrow.
Hope it is something simple and not expensive
 
Ok I've checked to make sure the airbox is sitting in the right position, checked intake hose and the pipe next to it. And the noise is still there.

I'm going to double check airbox is sitting right. But I'm gonna try and remove the airbox completely and fit the K&N
I'll have to wait until weekend when I've got the time and some daylight.
 
Also another note to add, the noise is definitely there when I rev the car sitting stationary, and when travelling changing gear from 1st up to 4th, being a constant 'note' until I let off the throttle
 
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I've fitted the air filter and the noise is still there, so I'm guessing there is a boost leak somewhere. But have no idea how to check this, will vcds tell me that there is a boost leak?
 
VCDS may be able to tell you when logging requested boost against actual boost?
There is lots of inter-cooler pipework around the front bumper area - could be something as simple as a loose clamp.

Inter-coolers are sometimes prone to splitting at the top - where the plastic meets the core.
 
Ok cheers, I'll have a closer look and check most visible pipe work.

As far as I'm aware I'm not losing anything but there is a definite whistle
 
Get a smoke test visually you can check for big splits so have a good check over first but its the small hard to get a splits that can cause the problem. Any good tuner/mechanic should have a smoke machine to test it should cost no more than £20.
 
Will have a look and see what's available around East Sussex, closer the better but don't mind travelling
 
if you fitted K&N filter you will have hissing sound. The standard air filter is also sound insulator.
 
It was there before, when I first tried to remove the standard airbox. Couldn't do it so put everything back on. That's when the noise started. So it's got to be something I've done
 
ive got similar on my tdi. can only be heard when initially revving on the spot, or a little when driving.

Its not boost im sure of this now, last time i had a boost leak there was black smoke and the whoosing was more evident on no throttle between gears etc.

Ive had an issue before with a loose inlet manifold. havin it smoke tested shortly and will see what we shall see...
 
If it is a boost leak, gives me a good excuse to upgrade to Samco hosing.

Still trying to find a mechanic who has the equipment for smoke test
 
Woot, mine was loose and missing manifold bolts. Smoke test was good to confirm no leaks, vcds already told me this on the way there mind. But he did spot the missing bolts. Local halfrauds auto centre ere happy to add a nut and tighten them all up for a beer, good stuff.
 
Found a local garage who can do the test, for £24. Just waiting date to book it in, hopefully this weekend
 
Still have not had car booked in to be seen by a mechanic. I looked yesterday and I can not find any split in any of the pipe work I checked. The only thing I have noticed is oily/greasy stuff on the pipe going too and possibly coming off the re circulator valve. I'm really hoping to get it looked at this Saturday. But just wondered if this is a sign of something.

Cheers
 
I had a weird noise on boost not too long after I bought my car. I could clearly hear it when accelerating and it would come in at about 3400-3500rpm. Hissing/screaming like a banshee kind of sound. No idea what it was as it has since gone away :uhm:
 
Sounds very similar to what I've got. Only there when engine is under load. So very difficult to find it when your heads under the bonnet.
Can't get car booked in and getting fed up with the garage now. So I'm gonna attack the problem Saturday.
 
Not had any chance to look more into my problem but searching the net tonight and come across this
http://youtu.be/Aw6xqtwRH9w

^^^ that is the noise I have. Now comments suggest ******** Turbo which I am dreading. But if it is on it's way to the scrap yard would the car still be driving ok (ish) the car feels a little under performed but I have been putting it down to a boost leak.
 
Check for loose intake/exhaust manifolds bolts...Also missing tips of the compressor blades will whine like that...
 
That sounds like a damaged turbo to me, especially if your not getting lots of black smoke to suggest a boost leak. You could have knocked something into the intake when wiggling the airbox off.
 
audi upgrades
Sorry for the delay.
I've not noticed any thing different smoke wise.

A few friends of mine have suggested turbo, I couldn't get my head round it, so I've booked it in to the dealers I bought it from. Fingers crossed.

Oh and warranty run out last week :(
 
had a look at the car again and there's a noticeable leak from rocker cover gasket, possibly exhaust manifold (not sure) also there seems to be a loose pipe which connects to intake pipe. Hard to describe but if you move another pipe connected to intake it feels stiffer than the other.

It's going in tomorrow afternoon and I've marked up a couple of bolts to see if they've looked at what I asked
 
Ok so my turbo needs replacing, garage quoted £700 to send it away be repaired and then fitted back. I don't have that this side of payday. So how easy is it to do it my self? Anybody got any tips, advice or any suggestions?

Please help
 
This is why I immediately turned round and said forget it, I'll pick car up tonight. I thought he was joking, got £80 labour charge to.
By the looks of it there's 6 bolts and the oil feed pipes. I need to find out which turbo it is first so I can find a replacement.
 
All fixed now, 3/4 damaged fins was the problem
Although there was sludge in one of the black solid pipes so will need to sort that out
 
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The sludge in pipe has been playing on my mind, and not sure what the appropriate steps in solving the problem are. The car is running fine and had oil change back in July so is it wise to get the issue sorted now? I've had no warning lights come on
 
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