Justin T

This is the first I have noticed this. I have a 2001 with @ 5600 miles on it. I have the Forge BPVs, and have had my 5K service and used Mobil 1 0W-30 synth oil.

Here is an example of what happens. I gradually get on it in 2nd and full boost does not come on until like 4K, but I do hear the turbos spooling up at low rpms. It seems like no matter what gear I'm in, it takes 1500 rpm going by at full throttle before I get the surge from the turbos, but I do get full boost when they finally kick in. This was not the case before...

Any thoughts? Thanks.

hermitage

Throttle Body Intake Boot. You need to replace it. I was under the impression that Audi had it solved in the 2001 models, but I guess not. I've blown 2 of'em. I have a 2000.

Check the Tech section here at Audi world, I'm sure there are instructions on how to replace it. The instructions used to be on Audizone.com, but I guess they merged or something.

wam007

HEY MAN! IT SEEMS LIKE WE ARE IN THE SAME BOAT.. I JUST GOT MY '01 S4 SILVER ON SILVER AND IT HAS THE APR CHIP AND A UUC SS. MINE COMES OFF THE LINE OK THEN STUMBLES AT 3K AND THEN ALMOST FEELS LIKE A DROP IN HP UNTIL 4K THEN IT TAKES OFF LIKE A BAT OUT OF HELL. HOWEVER, THE CAR THAT I TRADED IT IN ON WAS A '98 M3 W/ COLD AIR INTAKE AND SORRY TO SAY SEAT OF THE PANTS FEEL OFF THE LINE, THE M3 HAS IT. THE S4 HAS THE UPPER END THOUGH. I'M WONDERING IF WE BOTH HAV TORN BOOTS?? (F AND Y) MAY BE LOOSING BOOST PRESSURE AT LOW LOADS AND THE ENGINE IS ONLY GETTING BOOST AT HIGH RPM..
ANY THOUGHTS????

Kyle K: TampaS4

i have had that same problem lately. and i just went into the garage to look with my little mirror on a stick and the seem on the left intake of the TBB (which is kinda hard to see) has a tiny slit in it. Could this be the end to the problem!.. i'll have to wait and see..(till friggen monday)

The R

I've noticed it more when it was hot out.

rao

MAS - have it checked

Psyence

At lot of things cn cause this, including bad gas, high ambient temps, and excessive timing advancement in aftermarket chips.

SPYHNTR

Just recently. Thought it might be gas or the recent change in weather.

LMDA1

What is it with ECU's and 2001 cars, what exactly hasw changed from 2000 to 2001 that causes all these problems ? The only thing I can imagine is the ECU type (H, M, ...) brought about some new "tricks" the chip companies are not aware of. Glad to see I'm not alone with this on/off hesitation during acceleration.

Psyence

Whose chip are you using... not all are created the same