01 Accord, engine rattle off idle
 

Hi guys,

Just bought an 01 Accord coupe EX with 110,000 km on it. Everything seems
great with it so far but I have noticed that there's a bit of a rattling
sound from the engine if I gently rev it off idle to around 1000 rpm. It
almost sounds like a diesel idling, and if I had to say, I would say it's
coming from the exhaust manifold area. It's not there at idle and goes away
above around 1200 rpm -- maybe an exhaust manifold crack or leak??