My S2 coupe bit of a rebuild and repair thread.

[K Simmonds]

33 MPG is great going, your car must be running very well, I'd be chuffed with that!

Have only heard good things regarding Automark.

[B5NUT]

The car has already been to Automark. He checked the car over a few weeks after I purchased it. It's also going again this month for a full alignment.

[Rikki Kitto]

If you need tuning one of the top men in the country is next door to you, Automark UK, he live mapped mine on the road top bloke just outside Middlesbrough

[Rikki Kitto]

Thanks will take a look at the pins again. As they look plated I don't want to clean them as it were. Will take a look at ekta and see what type they are and get some ordered.

Get the gold plated pins from error 404 Alex

[B5NUT]

Some lovely roads up there bud bet you enjoyed the drive, where you based

Darlington. So down the A66, passed Middlesbrough and on the A171 all the way to Whitby. Unfortunately it was busy there and back only real passing point was birk brow bank.

[Rikki Kitto]

Thanks will take a look at the pins again. As they look plated I don't want to clean them as it were. Will take a look at ekta and see what type they are and get some ordered.

Get the gold plated pins from error 404 Alex

[Rikki Kitto]

Some lovely roads up there bud bet you enjoyed the drive, where you based

[B5NUT]

Had a trip out to Whitby same roads as the one to Scarborough. Also same sort of driving condition, but the roads were wet on the drive back. Anyway with the vacuum pipes change the MPG is now up again this time 33.2MPG. More than happy with that.
latest_,mpg.jpg

Will be performing a boost leak check this week, so will see if that brings any issues up.

[newsh]

Thanks for the info John, so that pipe does only ever so vacuum but for different reasons than I thought.

Yes, vac only unless the check valve goes wrong.
If you look closely at the image of the diff lock check valve in the tree diagram above, you’ll see one thing that can go wrong, symptoms of this are a loud whistling from under the rear seat

[K Simmonds]

Thanks for the info John, so that pipe does only ever so vacuum but for different reasons than I thought.

[newsh]

That T piece supplies vacuum to the AC recirc valve and it’s vacuum reservoir inside the left wing. It has a one-way valve built in to stop boost pressure getting to the recirc valve hence the clip on the manifold side.
There is another check valve under the back seat for the diff lock and it’s reservoir.

Here is Paul’s schematic which is a bit vague around this particular vac circuit. I think on the ABY the T and the check valve are all in one.


Incidentally, vacuum to the carbon canister is applied by the ECU opening the N80 valve when the throttle is closed, N80 is plumbed to a bigger pipe with another check valve and a T to the PCV under the inlet manifold!

https://forums.quattroworld.com/s4s6/msgs/188845.phtml

https://forums.quattroworld.com/s4s6/msgs/21014.phtml

[K Simmonds]

I'm pretty sure that short pipe with no clips is linked to the EVAP system and only ever see's vacuum, hence no clips.

[Rikki Kitto]

I'm not 100% sure it's the evap bud

[B5NUT]

That's how it's come from the factory. I've not touched that pipe, as to get access to it I've got to remove a fair amount of bits so have just left that one.

[Rikki Kitto]

Still worth putting clips on bud