The dealer told me it was a sulfur issue.. I have been using unleaded 87 octane .. switched to BP Ultimate gas . higher octane 93 .. to me to clean out the old fuel ..
the dealer has ordered me a new cataliac Converter .. there is a Bullentin out & a fix which will be to replaced the cataliac Converter .. which will take care of any egg smell ..
says this is a issue for some gx470 .. that have the older cataliac Converter when built ..
it runs fine with the higher octane ..that you for information I'll be sure always use the higher octane ..