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It's a "ticking" sound, right? My money is also on exhaust - - either a broken stud or a bad gasket. The heat of the engine causes the parts to expand, sealing off the leak, and the "ticking" goes away, often within minutes, or even seconds.
I had one of my manifold gaskets go a number of years back, and I described it to the mechanic as a valve noise as well. He said that given the history of these vehicles, his guess was exhaust, and he was right. The other side is now doing the same thing. I'm hoping to tackle this project myself this summer.
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Zilverado
1992 Pathfinder V6-SE 4wd
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