2002 pontiac grand am engine noise?

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Pontiac P

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i have a 2002 pontiac grand am with the 3400 engine. It has been fine until yesterday i started it and it made a clapping noise in the engine. This noise gets faster as i accelerate. As my engine reaches normal temperature, the noise stops completely though. what can this be, and what do you think it is?
 
Check your oil, not only the level. But the condition or state of it. You have a valve train noise, specifically tappets or the lifters. It gets way better with new synthetic oil.

V-6's also sound different on a hill or a grade, when oil runs down the galleries due to gravity, but that doesn't seem to be your problem. Number one cylinder also tends to be higher than the rest.
 
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