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Hi All,

Back around xmas 2006 i bought my first RS4, loved it but for many reasons had to sell. Now after a short and boring (car wise) leave i am back, another child in the ranks and definately in need of an estate. So i found and bought an Avus Silver avant on a Y plate. I must say i have missed the power and ride quality.

I am having some issues with it though and perhaps someone can help.

The car is 100% stock, sometimes it goes like a scalded cat, others it seems to have little or no boost, i have used the search button and sort or narrowed it to either MAF, DV's sticking or perhaps and EGT sensor gone, i dont have access to VAGCOM, anyone in the West Midlands that has?? and have i missed something thats obvious.

Also are there any independents in the West Mids?

Its nice to be back

Your symptoms make it sound like a EGT sensor. Could be MAF, but doubt that would make it intermmitent.

Good to hear your back with another B5! Enough said!

Sounds like its dropping into limp mode. Get down to MRC to get it checked out and repaired (and remapped!)

Thanks for that. The engine check passes as OK, but i guess it can still log a DTC. I will speak to a pal who may have access to VAGCOM.

check this thread

http://www.rs246.com/index.php?name=PNp ... ic&t=51359

plenty of people with vag.com who would help

Brilliant, thanks

new dvs maf and n75, then check to see which egts and lambdas have been killed. simple

Overlord wrote:Hi All,

Back around xmas 2006 i bought my first RS4, loved it but for many reasons had to sell. Now after a short and boring (car wise) leave i am back, another child in the ranks and definately in need of an estate. So i found and bought an Avus Silver avant on a Y plate. I must say i have missed the power and ride quality.

I am having some issues with it though and perhaps someone can help.

The car is 100% stock, sometimes it goes like a scalded cat, others it seems to have little or no boost, i have used the search button and sort or narrowed it to either MAF, DV's sticking or perhaps and EGT sensor gone, i dont have access to VAGCOM, anyone in the West Midlands that has?? and have i missed something thats obvious.

Also are there any independents in the West Mids?

Its nice to be back

i have the same problem with mine sometimes it has no boost at all and most of the time it goes how it should! keep ur results posted, will be interesting to know.

A friend had this with his B5 S4 and it turned out to be sticking wastegates on the turbos.
Only fix was replacement of the turbos.....

GULP!............

I do have a very good warranty though

Whats an N75?

its an electric valve that controlls boost, if it snot working right then you at worst will only be running around 7psi which is the actuator pressure. change those 4 parts and the car will fly.promise

jimbo1234567 wrote:its an electric valve that controlls boost, if it snot working right then you at worst will only be running around 7psi which is the actuator pressure. change those 4 parts and the car will fly.promise

I have found a local indy and will be booking it in next week, i take it the N75 is basically a re named boost control solenoid then.

Thanks for the advice

yep. a fish tank valve , in old speak. too bleed boost pressure off thus fooling the actuators

so if it is the n75 causing the boost to come and go will it show on vag com

rs4raz wrote:so if it is the n75 causing the boost to come and go will it show on vag com

I would guess not unless theres a sensor that monitors it. The Volvo's suffer with these too and i have seen a few blown engines, so as a matter of course i will change it. I guess they are under £80 anyway.

Thanks for the help guys, its appreciated.