Quote:
Originally Posted by tstevens
We just purchased a 2014 T4R with 87k miles, coming from a V8 4th Gen, same exact noise and it's been driving me crazy. You can hear it revving the engine sitting still and you can definitely here it while accelerating, seems to be loudest between 2500 and 4500 RPM.
Briefly asked the shop foreman at a local Toyota dealer and he thinks it's an idler pulley. I'm going to yank the belt of and see if it still makes noise. This thread has been very informative, thanks for posting!
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For future people that browse this post, here is the noise:
Outside in park free-revving:
YouTube
Inside during acceleration:
YouTube
I got underneath with a stethoscope and it sounds like its coming from the transmission pump, you can hear it particularly well though the lower transmission cooler line. The noise is extremely annoying and drives me crazy, but for now I am using @VWHillbilly's advice and turning up the radio.
For what it's worth, I've been paying attention to other 4Runners on YouTube and in the wild and unfortunately this noise seems to be very common.
