What is this bit on my a4 b5 1.8QTS

[Snow]

Hey all
So I have my lovely A4 QTS.
I did the timing belt myself on Saturday, the only proplems to report were:
snapped bolt on the headlight (came off in my hand guv)
and...the reason im writing this...snapped noggin on the watsit
There is a small thin flexible pipe that goes from the top of the engine )(turbo related I think), accross the engine and down to this round plastic junction in the fat hose beneath the right headlight.

I need to know what this 'thing' is in order to order one, also if any harm will come from driving the car untill this is sorted.

Jay

 

[aragorn]

can you get a pic? Its either boost or vacuum related or perhaps an oil breather. I wouldnt want to drive the car until you get it fixed though without knowing exactly what it is.

 

[Snow]

http://cid-d7f5a68e6326c3f9.skydrive.live.com/self.aspx/just random sum pic|4s/Pipe.jpg

Ive been looking into it a bit more and i think its may be either wastgate or BOV.

 

[Broken Byzan]

Sounds like the DV pipe, and as long as you not boosting like crazy it will be ok short term Just go for a 710N

 

[aragorn]

compressor stall on a K03 is not going to go down well, so if you do drive it, be VERY gentle with it until you replace the pipe

 

[jcb]

its a vaccum signal pipe come off the bottom of the inlet manifold.
get your camera phone and take a pic from under neath, bet there is a skinny pipe with nothing on it

 

[Snow]

Finally...this is the bit, cut off valve according to Audi...Although he did just have a good guess. I’ve sent him the pic too for identification.

http://cid-d7f5a68e6326c3f9.skydrive.live.com/self.aspx/just%20random%20sum%20pic%7C4s/a4b5%201.jpg

Can I replace this with an aftermarket part for better performance or am I better off sticking with the Audi part?

what does this do and will it damage my engine...I’ve been VERY very gentle with it today...boring but with the bonus of 35 - 40mpg
Still..rather the fast than the economical

Jay

 

[Broken Byzan]

Yep thats your diverter valve, get a TT one AKA 710N, its upgrade, and a shade over £20

 

[Snow]

Nice one Mark.
I assume I can grab one of those TT diverter valve 710N at the stealer. Any other trick parts I can replace while im at it?
Ta
Jay

 

[aragorn]

Yep, main dealer part, just ask for a diverter/dump valve for a 225bhp TT.

The part number is:
06A145710N
cut-off valve

 

[docurley]

You can replace the N75 valve with a N75J valve while your at it.