I have the same problem on a customers car
its only when it sits for like 30 mins
and its coming from the rear head i can't hear it right by the chain cover so it might be
1. too thin of oil
2.oil starvation
3. variable valve timing solenoid sticking and when oil pressure rises it works normal.
4. or chain slap but then id figure the tensioner is bad....
but it goes away so its not a potential.. cuz if it was the noise would be there regardless.
i haven't fixed the car yet im gonna look at it tonite.
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when I start up my 04 maxima there is this loud ticking noise comming from the engine but as I drive it the noise goes away but as the car sits for about 30 min you start it up you can hear the ticking noise again.
check for broken exhaust manifold bolts when engine is runing cold. Use stethescope or piece of hose and listen at each exhaust port.
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