frankpostie@yahoo.ca Posted December 4, 2019 Share Posted December 4, 2019 2006 Highlander 3.3 l, anyone have issues with their vacuum switching valve? Its mounted on the fuel rail, I think mine is not opening and closing when it should.... and this is causing a loud drone sound. Quote Link to comment Share on other sites More sharing options...
LeoS Posted May 9, 2020 Share Posted May 9, 2020 If the drone is most noticeable at a particular engine RPM range (regardless of speed), it is just a normal exhaust drone. Quote Link to comment Share on other sites More sharing options...
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