i have an 94 accord lx and the engine runs fine and everthing but afther it runs for about 15 mins or so it still start smokeing from under the headers from somewhere.ive done clean all the grese off of the engine and thats not it so if you have any idea about what it may be it would really help me out thanks

 

White or Black smoke? If white, you probably have oil leaking from somewhere onto your exhaust.

 

First suspect is the valve cover / cam plugs. It's the only oil leak sourse above the exhaust ports (and unless you're using magic oil, it still flows downhill).
The 15 minutes you ask; when you shut off the engine for the last time for the day, what oil that had leaks evaporates / burns off. On the restart in the morning it takes time for enough oil to accumulate in the valve cover to start leaking again.

At the minimum, you will need the valve cover gasket and and the spark plug tube seal(s). These ARE NOT reusable.

P

 

well its white smoke and i dont think its oil leaking cause i check my oil all the time and its in the same spot it hasnt when down any

 

White smoke accompanied by a sweet smell indicates a coolant leak (steam). White smoke with an acrid odor would be oil burning. Remember, it doesn't take much (a few drops) to cause smoke, and the eventual under hood fire.

Take your pick, and start looking for the offending pipe, hose or gasket