As for the problem, here is what I have experienced with my car.
It is only ever evident when absolutely hammering the throttle (entering the highway at speed or short runs)
I have related it to two issues - switching fuel providers has lessened the smell.
I also discovered that the previous owner damaged the HVAC system by forcing the pollen filter access damper open and breaking the linkage. This leaves my air system in an open or closed position all of the time. The dealer is fixing it under (used car) warranty, as I pointed this out days after purchase. This is a $2K fix for the dealer.....and the sulphur smell just pours into the cabin worsening the symptoms.
I have checked my catalytic's as well and everything operates normally including heat cycles.
I would think that if you are going into Lexus to have the catalytic's looked at they will undoubtedly point to your K&N intake as the blame. Be on the safe side and put the factory air box back in before getting a dealer to inspect this to remove all of the unknowns from the equation.
Digger08
It is only ever evident when absolutely hammering the throttle (entering the highway at speed or short runs)
I have related it to two issues - switching fuel providers has lessened the smell.
I also discovered that the previous owner damaged the HVAC system by forcing the pollen filter access damper open and breaking the linkage. This leaves my air system in an open or closed position all of the time. The dealer is fixing it under (used car) warranty, as I pointed this out days after purchase. This is a $2K fix for the dealer.....and the sulphur smell just pours into the cabin worsening the symptoms.
I have checked my catalytic's as well and everything operates normally including heat cycles.
I would think that if you are going into Lexus to have the catalytic's looked at they will undoubtedly point to your K&N intake as the blame. Be on the safe side and put the factory air box back in before getting a dealer to inspect this to remove all of the unknowns from the equation.
Digger08