2.0 TDI CBBB Start problem according to AGR

Hello and good evening, my name is Georg and I’m 55 years old. I registered here and today because I have a problem with my 2.0 TDI with CBBB engine. (despite googlen I can’t go further) I used the holiday yesterday to clean AGR valve and the front shut-off valve (all in all throttle valve). (There were no errors, action just because of extra consumption, finally) Everything was assembled and wanted to start the engine – no ignition! Starter spins the engine well, at first he wanted to ignite, but was within 2-3 seconds getting less and less, now he listens to himself like a turbine, but doesn’t jump on…. no compression can be, rather no diesel injection? fuses controlled, everything ok. Can’t one of the components, AGR or shut-off flap, because so broken that can’t be started any longer? can you check these components, or just replace try-and-error, so I wouldn’t have the problem if I didn’t want to burn the car again.