engine problem! part2 help needed

[timucin]

my car is not running as it should
turbo drops to 6 psi at 5000rpm.normally 14 psi.it happened
suddenly.there is no problem until 5000 rpm .

-no fault code
-changed n75
-changed bypass valve under n75
-all hoses checked three times!
-thought may be my nos-sprey damaged the intercooler,removed and sent
it to crack test.nothing wrong
-wastegate checked ok


what can it be?

desperately need help

[timucin]

ttt

[SteveH]

Intercooler O ring?

[timucin]

himm ...checked but will recheck again tomorrow morning
thnx

[charlie]

???

have a look at your air mas sensor. It could be dirty/contaminated or worst
Knackered. R u running stock or performance air filter??

[Lee]

Worth doing the infamous Mark H intercooler mod to replace the o-ring with some silicone tube. Look for instructions by searching the threads if you are not familiar with it. Top mod!

[Lee]

Instead of checking hoses visually for splits it is better to pressurise the intake plumbing (instructions discussed in another thread too). This will highlight splits which are not clear to see when inspecting un-pressurised pipes.

[timucin]

using k&n air filter.cleaned that stuff a month ago.(mas)

do you have www for Mark's intercooler stuff? will search

thnx

[Lee]

You can use the forum search option to find threads with keywords....here it is anyway:

http://www.s2forum.com/forum/showthread.php?s=&threadid=193

[timucin]

thnx
i will not install front bumper anymore,LOL i am removing it twice a week

[charlie]

sounds familiar

This sounds like a common set of symptoms that happens with many
K&n fitted cars. I and afew others experienced it. Vagsport cured it
but i bet u its MAS related. Its normally oil from the filter that contact/lines
the element which gives different current readings to the ECU & hence
ECU reverts to safe mode.
Their is no harm in Cleaning it, coz Audi garages tend to clean them to
eliminate running problems. It does not show up as a fault code.
Or if you can get a second one from a m8, try it in ur car.

[timucin]

do you think i should re-clean it? or replace?

[Lee]

Clean it by flushing it with clean IPA. Never touch the wire (it's not that delicate but you don't want to damage it or contaminate it). Flush it until the wire is shiny. My K&N was neglected for too long and it cause my MAF wire to go black causing major problems. I am careful when oiling my filter too by being sparing with the oil and I try to let it soak overnight before refitting. I don't think the K&N adds much power if any and it just makes my piston dump valve sound louder!

Is your DV intact? or has the diaphragm split (assuming you have a stock one)?

[charlie]

Definately re-clean it.
Did you re-oil the filter.( alot of people tend to over oil them)
R the wire mesh intact???
Do you have a boost gauge fitted???
Also check power supply to boost frequency valve.
To me 0.6 bar sounds like ECU safe mode

[timucin]

DV: i have just changed it last wednesday..k&n filter 10 days old.