Need help with startup noise: rattle/zip

[ClubSport]

I've got a 95 M42 with 85k on the clock that makes an annoying noise on cold startups. Not that cold either - anything lower than about 60F. As soon as it cranks and you let off the key it makes a rattling/zipping sound like the timing chain or something, but only for about 2 seconds. If you turn it off immediately and crank it again, it'll do it again, but if you let it warm up and make a warm start there's no noise. I tried upgrading to the M44 tensioner and followed the startup procedure with no luck. I've tried every oil from 0W-30 to 20W-50 with no change. The only thing that helps really is to give it some gas during cranking and get the rpms up right away at startup.
Anybody got any ideas? Starter maybe? Chain?

[roelpeeters]

I have got exactly the same problem, when you look at the oil pressure light does it make the sound rougly as long as the light is on?

mine does, and this to me is an indication that the tensioner is loosing its pressure over time when not running.

does anyone whether the tensioner is supposed to stay pressurised?