TDI lacking power

This is a photo of the pipe, the metal one on the lads car.
DSC_0426.JPG
as you might be able to see, it is very dirty and looks like it is blowing debris out from where the jubilee clip is.




this is the pipe on the breaker engine, nice and clean.

DSC_0427.JPG



Im going to check that and clean it up just to rule that out, not sure if it will but hey ho, ya gotta try.

Cleaned it up but there was quite a lot of oil residue inside the pipes.........any ideas lads?

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Umm, just had the car round to the wifes cousins garage and he plugged the gizmo he has into the car and it came up with this .

P1557 - Charge Pressure Control: Positive Deviation.


Taking it to Skiptons, (Mikes )on Sunday so he should find the same no doubt.
 

Skipton01

Admin Team
If the scan's been done, there's not really a lot of point in risking the drive - have you seen the causes of the fault code?

http://wiki.ross-tech.com/wiki/index.php/17965/P1557/005463

Check all the pipes and especially, check all the little vacuum pipes which emanate from the box behind the drivers side headlamp. My guess is that it's one of those, or the actual N75 valve that's at fault. This link, even though it's for T4 Transporters, gives some good info and stuff to check:

http://www.vwt4forum.co.uk/showthread.php?t=87750
 

Skipton01

Admin Team
Let me know how you get on - I'd not have much time on Sunday to do anything other than a scan, otherwise I'd have said come over anyway, but it sounds like the root cause has been found, now it's just a case of tracking down the culprit, which could take 20 mins, or it could take a few hours.
 
Ok lads, struggling to find this N75 valve. could someone point me in the right direction as to where it is please.
DSC_0439.JPG

I take it it is somewhere round the back of that lot top left.
 

depronman

Member
View attachment 36048
yes, all four A2 here at the moment have that black box on

Johnny it’s the black box on the drivers side inner wing. I pointed it out to you when I nicked the ecu out of the breaker a few months. Suggest checking the pipes first and then if nothing there swap the black box front the breaker to your lads car
On the earlier cars the black box was the 3 valve on the bulkhead but was cleaned up on the latter cars with a single unit on the inner wing


Sent from my iPhone using Tapatalk
 

Skipton01

Admin Team
John, I've put an arrow on your photo showing the location of the vacuum valve control box. Check all the pipes exiting there - I had a limp home situation on Tank before Xmas and a quick fettle with the tubes (I could feel them but not see them behind the engine), sorted things.

DSC_0439.JPG
 
Ok mlads, managed to swap over the black box thingy, started the car and still same, ticks over nice but when reaching 2000 revs it goes a bit loopy, engine suddenly revs high then falls and I can tell sumats not right.

Question is now, will the ecu still be in kind of limp mode? so will need clearing?
 

Birchall

Dick Chown Award 2016
It could be the throttle pedal electrics that are causing this butvthey would throw an error code for VCDS.

If you have changed any major components it is always worth clearing all codes just in case they are affecting the EVU state.

Steve B
 
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