Air box noise/chatter ?

[Quattro180]

I have recently been hearing a funny noise coming from the airbox/intake area? It sounds like a chatter or suction noise. It only does it when coming off the throttle. Car seems to be running ok but maybe using more fuel than usual? Any ideas?

Cheers

 

[quattro1]

your diverter valve is broken or the little vac pipe on it has split

 

[Quattro180]

sorry to ask a stupid question but could you try and tell me exactly where the diverter valve and the little vac pipe is? i assume that it is attached to the air intake pipe?

cheers

 

[Quattro180]

Does this help?

 

[Az]

My car does exactly the same! The previous owner had my car remapped so I always assumed it was due to that, and I've had loads of work done on the car by audi/vw specialists who have taken the car for a test drive after they had carried out any work on it and they have never said anything about it, so I assumed everything was as it should be. But now it's got me wondering too as soon as the diverter valve and pipe have been mentioned. My car wistles and sucks a lot under acceleration too.

 

[Quattro180]

It just doesn't sound right to me, unless anyone else knows different? The car seems to be using slighty more fuel aswell.

 

[Quattro180]

I am taking the car to a garage on Saturday and will report back

 

[Az]

Good man!

 

[C17LJR]

My car does exactly the same! The previous owner had my car remapped so I always assumed it was due to that, and I've had loads of work done on the car by audi/vw specialists who have taken the car for a test drive after they had carried out any work on it and they have never said anything about it, so I assumed everything was as it should be. But now it's got me wondering too as soon as the diverter valve and pipe have been mentioned. My car wistles and sucks a lot under acceleration too.

my mapped 180 does the same,

sounds almost like a distant police siren when i accelerate?

 

[Az]

my mapped 180 does the same,

sounds almost like a distant police siren when i accelerate?

Haha! Yeah it does! I like it, and always get comments about it from mates and passengers, my step daughter calls it the jet car.

 

[Higgsy]

on the 1.8T the diverter valve is at the bottom of the engine behind the offside foglight, should have 3 hoses coming out of it, not too sure about the 2.5 though, if its goosed or a hose has split, you should be able to see it from there.

 

[rawtor51]

Anyone else get this , my 130 does it , i had it into Audi and they said not to worry about it

 

[marktdisport]

my standard 130 also does it......... just a noise of the turbo coming off full spool id say......

 

[simon.m]

i have this sound too did not have it when i first got the car over two years back any one have a pic of a diverter valve and where it would be on tdi 1.9 so i can have a look ;-)

 

[rawtor51]

I was really worried about it to start with but Audi assured me I shouldn't worry about it, thay said some do it and some don't, they wouldn't turn away custom surely if somthing was wrong, so since then I don't take any notice of the noise, I was just curious to see how many other folk had the same.

 

[Widemonkeys]

Mine used to do it all the time, now it's stopped but my car also constantly goes into limp mode

 

[tdia4]

The tdi does not have a diverter valve.

My tdi 130 does it as well, i've asked before and it seems many other people have it.

 

[pbwatch]

I suffer this too on my 2.5tdi 180 but I also get a louder air rush noise and a noisy turbo under load when it is playing up! I have been told by a Turbo specialst and that it could be a cat issue creating more back pressure and causinbg the egr valve to remain open and cause the chatter when I ease off the throttle!

 

[Turkster]

sticky actuator on the turbo,

 

[iyrix]

Mine has done this since I had a major service. Not been too worried about it, but if it's something to fix I will.

 

[Turkster]

we had a thread on this one a while back, its a sticking actuator valve thing, i had this on my car, so i swapped my whole turbo unit over with actuator and the problem was GONE! ended up being the actuator,

 

[rawtor51]

Ah sweet , gives me somthing to look at ,

Thanks.

 

[iyrix]

Yeah same, need to have a look t some point.

 

[jonny_mcc]

this just started happening on mine last night when i reversed it into my parking space. Does anyone know if the actuator can be swapped without changing the turbo?

J