Hello,audi a4 b7 2,7 V6 been having a problem this summer
I noticed that it's starts very hardly when its warm outside and engine is cold- cranks for 3-10seconds before starting. Starts instantly when weather got colder
If engine gets to work temperature it starts instantly no matter its warm or cold outside.
VCDS won't show any problems

 

Recently my car has been having a difficult time starting only when the engine is warm. It cranks strong but it takes a while to actually start up the engine, maybe 3-4 seconds more than usual. This issue also persist when I let the fuel pump prime before starting the engine. It only happens when the engine is still warm, on any cold starts it starts up immediately with no issues. I have also noticed when this started to happen that my gas mileage has dropped to 13-16 mpg, when I used to get 20+ mpg. The car runs fine otherwise, no rough idle or anything like that. No check engine lights, spark plugs were changed 2k miles ago, and the battery is only 2 years old. I tested the voltage on the battery and it was 12.6 volts, so I do not believe it to be a battery issue. Right now I am leaning to high fuel pressure. I preferably can't check my fuel pressure, as the local shops in my area don't have the adapter for my fuel lines and I would prefer to not spend money on the adapter to diagnose. If I have to then I have to though.