Problem with my s4 2.7t
 

hy, I m writeing from Romania, and i have some problems with my s4 2.7 biturbo
I need to mention that here is quitley a rare car and there are so few that can help me
The car want pull only aftere 3500 rpm. i change the sparks wich were ngk- original
with denso iridium sparks and now it goes even worse.
it has a pause at 3000 4000rpm.
then i changed my coils but the problem is stiil there
on the laptop it sows that the presure of the turbo is at the minimum something about 900 then goes directley to maximum somthenig about 1900 2000.
is anyoane who had a similar problem? can U help me please????

big boost leak. bad DV valve, bad boost control solenoid, bad/stuck wastegate. is it misfiring? what codes does it have? if any. Whats fuel trim say when driving or accelerating?

What problem are you trying to fix? Are you having a misfire, lack of power, check engine light on or flashing? Let us know more info and include your DTC codes and I'm sure someone can help point you in the right direction.

fuel is about 30 L on 100 Km, and it sais on computer 18L 100km, i cecked for bost leaks it s seems that ther are not.
on the wag it says that there are no mistakes., no misfire, nothing.
I tried the DV Valve on the Vacum but thhey wont keep the presure.
How are they supose to Work On the vacum? or on the right presure from the turbo they go up? from what i red i understud that they go with the Vacum and mine are nt doing eniting.
the car seems to lose the power when accelerate sharp. When going easy on the pedal it goes very weell.

i also cecked the westgates they seems to work very well.

the DV valves should hold vacuum when applied to the diaphragm, if they do not, they are junk.

thanks, i aspect them they arive in 4 days. the cruise control is also no working. think can be any conection??

Do tou think that the Dv could be my Problem??

today i took out a coil to see if wag can see any misfire. and i d didnt ! the engine was running in 5 pistons and the computer said that there are no mistakes. Is that normal for this car?

Well misfire moniter takes a few minutes to finally pick up misfires. Not sure if DVs could be the issue, but you must fix the obvious and continue going.