A4 won't start.. the previous owner put a brand new head on it and timed it wrong and ruined it so I put a new motor in it well used motor in it the motor was running in another car now I have no spark the car will not start it just cranks cranks good good power change the camshaft sensor crank sensor and cam adjustment sensor I think you call it so they only sensors I changed and still no spark don't know what's wrong any info. It's a 2009 A4 2.0.