Just purchased my 2000 S4 about a month ago. Car was mainly stock except for a full exhaust. Yesterday I had the car tuned to stage 1. Car was running great, pulling much harder than stock and boost appeared to be right on point with a stage 1 tune. On my way home I stopped and talked on the phone, while I was on the phone I got a check engine light, while pulled away after my call I hit the throttle and realized the car was not pulling and my boost gauge was stopping at 0 PSI. Vacuum appears to be normal and the turbos seem to be spooling as they usually would. I was really worried about the turbos being blown, but wouldn't I still make some type of psi/would they both go at the same time and I get no PSI? I have all the stock silicone turbo piping, I knew this needed to be replaced but I figured It could wait until next week. Babied the car home, avoiding any type of boost and checked my codes. Only codes that have appeared are for the upstream 02's(a code I usually have with this car). All piping appears to be ok, but I will not be able to test for leaks until the weekend. Does anyone have any insight on what this may be? Thanks in advance for any help.

 

check your throttle body boot and intercooler hoses. the stock ones are rubber and tear easily at the throttle body. the lower intercooler hoses tend to blow off at higher boost levels.

sounds like you have a massive boost leak. you can also do a boost leak test if you cant find the leak.

http://www.awe-tuning.com/media/pdf/...ure_tester.pdf