If your in the cabin with door closed and you hear it, it must be pretty loud. Can you have someone else crank it, while with the hood up you listen to make sure its not the tensioner or chain hitting the rails. Doubt you would hear the crank noise, but it could be a power steering pump needing a fresh fill?
You said it only does it when its cold start for only a few seconds? What weight/type oil do you use? Try and listen with someone else starting it up.
1989 420SEL 105575 miles
1990 Chevrolet E-Cab C-1500
1989 Olds Toranado Trofeo'