I have bought an Audi A6 2 weeks ago,which I'm very proud of, but now I'm seeking help with my cold starting problems.
The engine is 2.5TDI engine code AFB, it has 286000 km on board (with the camshafts replaced at 217000 km, for those who are wondering). A few days ago I personally changed the timing belts and the thermostat. This is how the timing looks like now http://i48.tinypic.com/2luswu1.jpg . I think it's pretty good I also verified all the glow plugs.
The problem with starting first time in the morning is that it takes 5-8 seconds of turning the engine until it starts up. After the engine is warmish, it starts pretty damn well.
Today I did a little experiment, at -2 degrees celsius: started the engine(took around 6 seconds, after the glow plug light went off). After 30 seconds of running, I switched off the engine and started it again. I started in like 1 second! Switched off the engine and tried again in half an hour: at least 5 seconds of turning the engine...
For a side note, I use 15W-40 Mobil Oil and no fault codes appear using vag-com.
What else can I verify to solve this annoying problem? You guys are the last hope before going to a damn service!