urs4 no boost

[gavs20v]

firend of mine has just bought his urs4 over, no boost whatsoever. Its blown the small vacuum pipe of the dump valve. When blipping the throttle theres is a metallic screeching noise coming from the flexi tub going from the wastegate pipe to the down pipe. Im guessing somethings shredded itself and is causing a blockage. No nasty noises coming from the turbo or any sort of smoke put of the exhaust whatsoever. Minimal axial play in the turbo coldside.
Any ideas? what could be in the flexi pipe? i thought possible cat, simlair to fat audi 80?
any suggestions will be glady received, going to let it cool down then take the flexi section off to have a look.
Cheers
Gav

[RoadKill]

Right took the flexi tub of and it was all clear, i poped it in to my mates garge to do a bost leck test with nuthing he seems to think if could be the waste gate opening to erley its all a bit

[RoadKill]

would the faut finder work? i have tryed but it dont seem to work

[audiman]

Sounds like the spring has broken inside the WG or something?? Maybe a completly torn diagphram in the WG?? Either that or the turbo shaft has snapped, fook knows? Sounds a weird one.

[audiman]

Maybe the WG valve has broken?? so it makes no seal?

[RoadKill]

i have got to take the turdo off as i have a small crack in the manerfold so will be aball to have a good look,

[Corey]

would the faut finder work? i have tryed but it dont seem to work

Only with a bit of work, you need to remove the instrument panel and behind it you will find the main i/c loom follow it across to above the aux dials you will see a buld holder the is tied up, not affixed to the aux panel, put a bulb into it and it will blink out codes if you follow the correct procedure.
I managed to get this to work on my 92 S4, although the same function is not possible on my S6 as the loom is totally different behind the i/c.

[RoadKill]

thanks will give it a go

[Mihnea]

Guys, check the boost hose going to the ECU, it goes from the intake manifold to under the plastic cover on the bulkhead, and it connects to an "empty fuel filter", which is a fuel vapor separator, it is a very known problem for the hose from the IM to the "empty filter" to come off loose, in which case you'll get no boost at all.

If the dashboard's boost gauge is indicating 1.0 Bar all the time, it's 100% your problem as it's been dozens of other people's issue as well...

HTH,

Mihnea

[RoadKill]

can some one tell me the part number for the pipe that gos from the turbo to the blow off vale and to the pip that runs under the car ? its 100 s4 my be under s6 , i would do it but im at work and would like to order it by 2pm so it will be here friday

thanks ben

[merlin's S4]

Did you know that you can buy Samco hoses for the S4? About £220 for the set (3 hoses) last time I looked which is way cheaper than the standard ones from Audi! S6 is the same as long as it's pre '98. AAN engine code and C4 chassis!

[RoadKill]

audiman im going with you i think the turbo shaft has snapped , well will find out tomow when i take it off, nice job not!!

[RoadKill]

yep the turbo shaft has snapped ,

[RoadKill]

got a new turbo its on and the beest is back