maybe someone can help me. I have bought Audi A3 tdi 1.9 2007 some months ago and few months ago car became hard to start when the engine is cold. It usually takes like 20s+ of cranking for it to start. Once you start the car , you can turn it off and on again with no problems also i can still come back after like 2-4h and it will start with no problems in like half a second (time varies no idea why, sometimes you come back after 2h and its already dead and you need to crank 20 seconds again, sometimes even after 3-4h it starts without problems). If i leave car for longer periods like overnight or during working hours(anywhere from 5h+ to like 10h+) then i always need a long cranking for it to start again. But if i leave car turned off for even more longer periods (like a day or two passes since last driving, usually during weekends, when i don't drive) - it starts again with no problems. At first it was at random, like few days car drives with no problems, then another day i need to crank it to start and for the last month and a half that i have been driving it became permanent. I went to a few garages and in one they changed :fuel filter, rubber seals for fuel injectors, took out and cleaned fuel pump, checked glow plugs and engine compression
Nothing helped and they didn't want to bother more so i went to another garage and they said the problem was damaged wires. They changed it and said everything should be fine now, but nothing changed i still have the same issue. Also when it was a bit warmer while you crank u just hear the starter making the normal buzzz sound, but when the temperature dropped a bit now, whenever you crank for like the first 5-10 seconds you can feel vibrations/shaking from engine and then it goes to normal starter buzzz sound.
If anyone could help i would really appreciate it, Thank you