Occasionally, mine will make a ticking noise after a cold start (few days+). It goes away after a couple minutes of the engine running though...
When it first did it, I changed one of the pullies and it stopped. It started doing it again, and I tried another pulley.
So far, I've changed everything except the crank pulley and alternator (changed the tensioner last fall). I still notice it. It sounds like it's coming from the left/front of the engine, not the top (valve cover/head area).
I didn't notice it changing with throttle increase though. It usually went away after the engine warmed up a bit.
I'd check your pullies...
When it first did it, I changed one of the pullies and it stopped. It started doing it again, and I tried another pulley.
So far, I've changed everything except the crank pulley and alternator (changed the tensioner last fall). I still notice it. It sounds like it's coming from the left/front of the engine, not the top (valve cover/head area).
I didn't notice it changing with throttle increase though. It usually went away after the engine warmed up a bit.
I'd check your pullies...