My rx300 has 250000 miles and ran great (except idle) Now it makes a loud hum n on 1999 Lexus RX300

noise. Acts like it is not gettin fule. I changed the gas fule pump and filter but it did not help - can anyone out there help - thank you. Diagnostic shows nothing wrong???

by in Gravois Mills, MO on July 18, 2012
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1 answer 1 comment
ANSWER by , July 19, 2012
Broken/jumped timing belt.? what other symptoms?Did you test the fuel pump before replacing it? Check fuses ECM1 & ECM2(or may be labeled EFI)
COMMENT by , July 20, 2012
I replaced the mass air fule sensor - did not work I had it towed 100 miles to the dealer - hope to hear from them today and will post the results Thank you so much for taking the time to held Just heard from toyota dealer said it's the "air fuel ratio sensor" $400 parts and labor thanks again