SOUNDS LIKE A CHOKE PROBLEM
A properly tuned A4 will need brief full choke to start even when it is fully warmed up. Are you using a bit of choke when you try a warm start?
Let's do the easy stuff first. Be sure the choke is opening and closing fully when you think it is. Others will be along with more ideas.
Welcome to the forum. You will get more responses if you start a new thread.
ex TRUE GRIT
Edit: Is there a PCV valve on the engine?
Last edited by JOHN COOKSON; 10-17-2020 at 01:52 AM.
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