2009 E93 330i cold start issue

[andysteele]

car is fairly new to me, when starting it in the morning it turns over fine, sounds like starter motor and battery working well, but it does not fire immediately. Fires on first turn when warm, or even at the end of the working day, but when the car is cold (lives outside over night) it takes a few seconds to catch. Once started its fine, it has once done a bit of hunting at idle, revs dropped below 600rpm idle speed but it clear once running.

having googled cold start problems, i mostly get rough idle items, but dont think this is the same.

car is at 57k miles, no record of having had spark plugs, which appear to be due "every 3rd oil change" so i reckon these should be done, but sounds like there are many things that could be causing the issue. my main concern is that it wont start one day.

any thoughts?