I recently purchased a '21 Toyota 4Runner. After the first 50 miles, it developed a louder idle noise, quite a bit noisier than I’d heard in the vehicles that I test drove, and louder than the '20 that I took out for a full day. That was kind of disappointing but it didn’t bother me too much until I drove another hundred miles or so. By that point the noise had increased once again, to the point where I can now hear it while I drive down the highway (40+ mph). It doesn’t seem to vary with road speed or engine speed, except I don’t usually hear it between, say, 10 mph and 35 mph. Any idea what this is? Does it sound normal?
Idle noise: Record - 005 by l | Free Listening on SoundCloud