What was found
AFTER TAKEOFF AT FULL POWER, DETECTED AN UNKNOWN ODOR, REDUCED POWER TO APPROXIMATELY 30" MAP, ODOR WENT AWAY. AFTER LANDING PERFORMED A FULL POWER RUNUP, ODOR RETURNED. COULD NOT IDENTIFY THE ODOR AS EITHER FUEL FUMES, EXHAUST FUMES OR BURNING ODOR. CHECKED BY MAINTENANCE, NO DISCREPANCIES NOTED.