I'm about due for a Timing Belt replacement on my A3 (120k miles). I checked out Drivbiwire's Pictorial Guide for this in FAQs. Looks too advanced for me, especially with all the special tools (cam shaft locking bar, injection pump lock pin, special locking bar) & the software he uses at the end to test the Timing. Anybody have any easier method or with non-special tools to accomplish the same thing?
I'm not scared to do things myself, but sometimes you need to face the music and know when something requires a professional. I'd rather have the engine blow due to the pro's mishap rather than mine.
BTW, GoFaster helped me out last month by steering me to the Manifold Pressure Senser problem/solution in FAQ-Troubleshooting. The hose replacement (found right size!) made a big difference although I still think it's behaving somewhat wimpy on me at around 90mph depending on which way the wind blows. If I get a slight head-wind, I peak at 90mph on flat terrain. I've still got Stock ECU Chip.