sans

Last month I had a GIAC chip installed in my 98.5 A4 1.8TQM. You couldn't wipe the stupid grin off my face as I was being thrown to the back of my seat.

Last week, however, I lost the "umpf", and now the car feel more-or-less stock. I can't even be sure that the turbo is spooling anymore.

I put the key in the "on" position (without starting the car) to re-synchronize things, but no luck. I even unplugged the battery in hopes of resetting the ECU, but still no change.

What could be wrong? Is it the ECU? The turbo? The DV valve? (I had a Forge installed 3 years ago in anticipation of future power upgrades)

History - half a year ago I installed a Milltek cat back. It seemed a little louder than expected based on comments in the post, but the installer couldn't find a cause for it (it's "normal"). Now around the same time as my power-outage it seemed that the exhaust got even louder. Can they be related? Possibly a leak at one of the joints throwing the O2 sensor readings out of wack?

Help!


1998 A4 1.8TQM
GIAC Stage 1
Milltek Exhaust
Forge DV Valve
Brembo Rotors
EBC Pads
Spec Stage 2 Clutch
Spec Steel Single Mass Flywheel

JAFO

first thing i'd do is reseat the chip, then check the dv.

Ray Khan

I wouldn't bother, if the chip wasn't seated, the car wouldn't run right?

Atomic864

and installed an APR chip. It did okay for a bit, but then felt weak (and I wasn't hearing the turbo either). I think that my turbo was going out and the more aggressive programming finished it off. I bought a used KO3, but then ended up upgrading to a Stage 3. I would check the turbo. BTW, mine didn't throw a code

dgkula

Are you seeing any DTCs?

sans

DTCs???

dgkula

Diagnostic Trouble Codes (seen with an OBDII scanner or VAG COM)

sans

It was the vacuum hose to the DV ... all's well now!