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Re: tappit noise source
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My wife has a 2003 Buick RDV with 3.4L engine and it "ticks" during first start up as well. Especially during colder weather start ups or when vehicle has been sitting for 5+ days. To reduce the ticking sound (and being hotter summer temp weather), we use thicker #40 engine oil (instead of recommended #30 oil). This thicker oil (only during hotter summer weather days seems to reduce its upper engine ticking noise) seems to help. In all, my wife's Buick's 3.4L engine has been ticking for years. And, its still going strong... (giant smile).
Hope this helps...
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