[Honda] Procedure to pinpoint the problem---
1. Allow the oil to drain from the VTC system by not starting the engine for at least 6 hours.
2. Start the cold engine, and immediately listen for a loud rattle:
Do you hear a loud rattle that lasts about 2 seconds?
This seems to precisely nail the problem. Bulletin Number: SB-09-010 HONDA: ENGINE HAS A LOUD RATTLING NOISE AT A COLD START UP. *PE UPDATED 11/5/12.
PassatB6-How did you come to know how often K24 engines have this problem, unless you are a Master Mechanic, and from your nickname I would surmise you worked on VW's at some point. In either event, THANK YOU!!!!!!!!!!!