buzzing noise when cold?
 

this past week i had to move my 85' targa from my heated garage to my unheated garage. the next day i went to pull it back into the heated, it was around 30 degrees out and when i first started it i hear a slightly lowpitched buzzing noise coming from the rear for 1-2 seconds then it sounded normal.
i haven't gotten into it yet but will be in the next couple of weeks for my valve adj/oil change/gear oil change/plugs and such.
it doesn't make the noise when its warmer (around 50).
i have started to hear some ticking from the valves and the oil level is fine, and there isn't a single oil leak under the car.
any help appreciated.

bell
85'911 targa

does anyone have ANY ideas?
it does do it consistantly when it's cold out, but not when it's warm.
could it be either a cold timing chain?
any ideas will help

This is a shot in the dark....
Does your car have automatic heat? My automatic heat makes a buzzy kind of sound when cold. If you do have auto-heat, try starting the car with the heat off and see if your noise goes away.

carrera tensioners tend to do that in cold weather. more of a whirring noise. kind of a non-problem.

i did make sure everything was turned off when i diagnosed it.
the tensioners make the most sense, being when i first start it when cold and it makes the noise, then if i shut it off then try again it doesn't make the noise.
i'm going to have a friend start it while i listen to it to determine exactly where it's coming from.
thanks for the help, new noises always make me investigate:)

It may be the vacuum valve just by the oil filler, Porsche redesigned this part and you should check if you have the latest one. Get some-one to start the car and put your hand on the valve, if it's noisy..replace it. There is a bulletin for this somewhere.....