Loud "Lawnmower" like sound when car engine is cold
Hi guys, my galant 2001 v6 gtz produces a "lawnmower-diesel" like sound every morning that it can wake up the whole neighborhood. It only happens when the car's engine is cold otherwise everything is ok and i couldnt hear the irritating noise from the engine once it has already been warmed up. The noise usually last for 2-3 minutes then it will just diminish. Any ideas what might have had cause this? I have it recorded and ill try to post it here soon.
I heard about hydraulic lifters, exhaust, water pump and etc. I just want to make it sure what part of the engine is the problem. Hopefully, this is not something serious and i dont want to spend a lot on this. Thanks in advance.l :)
BTW, I just had my battery replace and an oil change. I tried to apply the "prolong engine additive" but it didnt help. Any suggestions?
Here's the video/clip:
http://www.youtube.com/watch?v=-77junpVvnY&feature=plcp