boost at 1.1bar constant

100turbo c · 26-03-09, 06:07 PM

hi my s4 aan engine has just sudenly decided to stick its boost at 1.1 bar and wont budge up or down?the engine is not pulling either for obvious it is not boosting ? anyone have any ideas what could be wrong?

20vcqdriver · 26-03-09, 06:26 PM

If thats 1.1 on your gauge that means 0.1 bar boost, so nothing.. If it's suddenly gone it could be the wastegate sticking or diaphram gone. Normally when faults on these engines occur it goes to mechanical boost of 0.4bar. The fact that it's not even giving that would tell me its the wastgate itself..Good luck.

Puglife · 26-03-09, 06:59 PM

Any suspect noises from engine bay? Noteably whistling or hissing....
As mentioned its making essentially nothing over atmospheric pressure so will be a problem linked to the turbo and boosting side.

Are all pipes still connected between the turbo and the inlet.

100turbo c · 26-03-09, 07:22 PM

no its not the waste gate just checked it, but it does make a gush sound as you change gear like dump valve sound, also surges under acceleration, i disconnected the n75 and nothing changed could it be this

quattrokid · 26-03-09, 09:04 PM

does it make noises like this:

http://www.youtube.com/watch?v=XSEFUIcgOy0

could be a blown turbo/ seized

26-03-09, 06:26 PM	#2
20vcqdriver 4 ring whore! Classic Audi Club Member Join Date: Dec 2007 Location: Wirral Posts: 3,910	If thats 1.1 on your gauge that means 0.1 bar boost, so nothing.. If it's suddenly gone it could be the wastegate sticking or diaphram gone. Normally when faults on these engines occur it goes to mechanical boost of 0.4bar. The fact that it's not even giving that would tell me its the wastgate itself..Good luck. __________________ Coupe quattro 1986:-~450bhp + loooong list of mods! Audi A7 Bi-TDI SLine Black edition 2015 mapped to produce 600lb/ft torque! Audi S4 4.2 V8 cabriolet 2004:-

26-03-09, 06:59 PM	#3
Puglife ==>PUGSPORT!<== Classic Audi Club Member Join Date: Jan 2008 Location: Leyland Posts: 1,544	Any suspect noises from engine bay? Noteably whistling or hissing.... As mentioned its making essentially nothing over atmospheric pressure so will be a problem linked to the turbo and boosting side. Are all pipes still connected between the turbo and the inlet. __________________ 1986 UR Quattro - (1982) Lombard RAC Group 4 recreation - #24 H.Demuth/J.Daniels 1981 VW mk1 golf GTi - now 5cylinder and RWD.

26-03-09, 09:04 PM	#5
quattrokid 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Ayrshire Posts: 9,654	does it make noises like this: http://www.youtube.com/watch?v=XSEFUIcgOy0 could be a blown turbo/ seized __________________ RS4 B5 (wife's / ours now ) S3 8L Imola Yellow S3 8L Nogaro blue UrWR SOLD UrS4 saloon (SOLD again) S4 Cabrio (SOLD) A4 cabrio 2.5 V6tdi (SOLD) 80 cabrio 2.6 V6 SOLD 90 quattro 10v SOLD 100 2.2e SOLD FOUNDING MEMBER the 200,000 Plus miles Club

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26-03-09, 07:22 PM	#4
100turbo c Grown up member Join Date: Feb 2008 Location: hampshire in new milton Posts: 350	no its not the waste gate just checked it, but it does make a gush sound as you change gear like dump valve sound, also surges under acceleration, i disconnected the n75 and nothing changed could it be this