What was found
DURING ENGINE RUN UP, STRONG EXHAUST FUMES WHEN APU WAS ON. DEFERRED IAW MEL. PERFORMED FIM 49-55, TASK 802. INSPECTED APU COMPRESSOR INLET PLENUM FOR FLUIDS OR BLOCKAGES, NONE NOTED. AREA WAS CLEAR. NO UNWANTED MATERIALS FOUND. NO LEAKS NOTED. RAN APU WITH PACKS ON & APU BLEED. NO FUMES OR UNWANTED ODORS NOTED. DEFERRAL CLEARED, PLACARD REMOVED. OK TO CONTINUE SERVICE. ALSO PERFORMED AN APU BITE PROCEDURE, NO CURRENT FAULTS NOTED.