2001 Nissan Quest engine warmed

Problem :

when i start my van i instantly hear a rapid ticking sound coming from the engine. once the engine is warm the sound fades. what does this mean ?what should i do?

Another solve:
that is the lifters or tappets doing that due to they could be warn out or also you have a slack oil pick up when the sound fades it means oil has reached them you will have to see a machanic to fix them around $150 to $220.

Our Solve: Change the three things, namely- piston with pin, n liner, n piston ring. This will solve the prob.