MattxFatal

iTrader: (4)

http://www.youtube.com/watch?v=mSJXdi3uH4Y

Only happens after warm up.
Not all the time either.
Goes away once I get above 2k.

Lifter? Bent PR?
Valvetrain is stock as far as a know.
Has done this for a little while now.

I use GC0-W30.
-Matt

blackws6ta

iTrader: (1)

Hey - Both my 99 z28 and my 00 ws6 make this sound. I work with a guy that was a GM Master tech and he said that they would have this problem come back even on new vettes (c5 at that time). What I do is get some AC Delco Top Soak Piston cleaner and use that. I get it at a mechanics disount and the dealer charged me 8.99. What you do is pull your spark plugs and pour a measured amount down into the cylinder and let it "soak". It breaks up the carbon on top of the pistons. Make sure you cycle the engine a couple time with the key before you put the plugs back in or you may Hydro-lock the engine. This works for me and it gets rid of that sound, till next year. I drive my cars maybe 2500 miles a year so they do a lot of sitting during the winter time. Not sure on your driving amount or your specific problem but it sounds almost like the same sound I have and this works for me. Hope this helps

Mike

99RTA

iTrader: (-1)

My 02 is about the same but starts when its cold, sounds like lifter-rocker tick to me. Seems the 02s were really bad for this.

Starion

iTrader: (5)

+1 for being an 02 thing. My 02 makes intermittent noise like this also when it's hot. Using GC 0w-30 too. Might try a little thicker oil on my next change.