I have an Audi A6 2.7 Biturbo....Im having some problems with it....when i push the car hard it goes but the is not working the same as in the beggining, now when i push the gas all the way it doesnt work fully and when i let go of the gas it kicks back, dont know.... if anyone can help i would appreciate it, and know any good mechanic in Mississauga or Toronto

 

Have you checked for any turbo leaks in the hosing?

 

With the information provided one could ask even for the color of the car - anybody's guess.

 

Any mods to the car not mentioned? Do you have a boost guage? What do you mean Kick Back when throttle is lifted?

 

Have to agree with Mikeh. Check for turbo leaks.
Check the Y-boot intake, as this is known to wear and develop cracks. But actually feel the boot. Mine looked good, but squeezing the boot showed it was done.

 

He means the car is bucking and surging, sounds like the TB boot is destroyed

 

I believe I may be experiencing a similair problem with my A6 Bi-turbo. if I only push the throttle to the point were it takes additional pressure to depress farther, it holds around .7 bar and pulls strong in the higher gears, but once I push past that throttle point the boost drops to about .4 bar and the transmission downshifts bringing the rpms up but with no noticable increase in acceleration. I would like to know what NIKI found since no more replies indicates he fixed the problem.

 

Suggest to Pressure Test the Intake with the AWE style home made $20 pressure tester to find any intake leaks. Sometimes things like the plastic end caps on the Intercooler tanks begin to leak especially when chipped.

Remove the clamps from the TBB and inspect underneath as TBB like to tear under the clamps, especially the large one on the Throttle Body.