Hey guys new here with a recently purchased 2003 Audi a4 1.8t Quattro so im having a huge problem no getting any spark car will not start cranks just fine will not spark recently replaced crankcase vent valve last week the radio did the backlight thing so I tried disconnecting the battery now the car wont start radio wont turn on (I was having rough starts before I disconnected battery) light checkd all fuses including ones next to the ecu need help please only means of transportation!

 

any help would be appreciated

 

Post also in the appropriate A4 section and you'll get faster responses.