170 TDI manifold actuator - help needed please

[quattrodave]

I've just discovered the vacuum diaphragm has split and the valve won't be working now.
Question is, what exactly does it do ?
Do I need to replace it straight away or can it wait a while until I remove the egr and manifold for a clean ?
Also, can anyone help with a list of gasket part numbers for the manifold and egr and also the vacuum actuator itself
Many thanks

 

[Macdoon]

Check this thread out pal, should be all the info you need

http://www.audi-sport.net/vb/audi-s...alve-cleaning-thread-before-after-pics-3.html

 

[quattrodave]

Thanks just read that, good info there
What does it do though - any ideas ?

 

[hubbo1]

the diaphragm controls the swirlflaps in the inlet manifold, if it is split you would get a flat spot/hesitation around 1800-2000 rpm.
I changed mine and it was a different car! actuator is only about £12 iirc