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Originally Posted by jwall
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I know I'm new here and I'm not trying to be a jerk, but who told you summerwind that is was the injectors? A Toyota technician or dealer?
so, FWIW
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A Toyota Tech and also it has been discussed on ToyotaNation before.
you can do a Google search on "fuel injector noise" for more discussions.
With the engine mounted sideways, the fuel injector rail for one bank is along the firewall. On vehicles with engines mounted front to back the injectors are away from the firewall. Don't know if this influences engine noise getting transmitted into the passenger cabin or not but it would seem to be one explaination.
If you lift off the plastic cover from the top of the engine you will see Toyota has sound deadening material on the underside of it. It helps some.
What ever answer you get regarding the source of the noise you will get the same answer "it's normal" 
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2008 Highlander Limited AWD, Silver, SmartKey, VSC/TRAK, Bluetooth, Remote Start, No Nav, Tow package/hitch/color matched fascia, roof rack cross rails, Color keyed mud guards, Camry trumpet horns
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