What are the symptoms of a bad PCV valve?
dirty valves but with D.I. can't really tell. Best to change it around 90-100k miles.
will changing this stop the engine rattle noise i have at cold start?
No, you need to replace the VTC spring. I have a video on that, look in the FIT playlist
Thank you for a sharing this! I lost the washer too, but was able to reach it with a coat hanger and it fell out the bottom.