2010 Forester, Manual Transmission, wierd sound

kulharinkulharin Member Posts: 2
edited May 2014 in Subaru
Hey, I just bought a new 2010 Forester and I was wondering if this is normal. I notice this odd sound with the windows rolled down coming from the engine. It only seems to occur shortly after I have shifted and have begun to accelerate or slow down, mostly during the lower gears, 1-3 and while running at lower-midrange speeds. I will hear a soft "switch" sound and the engine humms at a slightly higher pitch while running at the same speed. As a result notice 2 very distinct sound pitches from the engine.


  • kulharinkulharin Member Posts: 2
    very frequent when I switch on the AC, happens almost instantly, but it still occurs less frequent when the ac is off
  • ateixeiraateixeira Member Posts: 72,587
    Could be the ECU adjusting the throttle position for emissions purposes. Is yours a PZEV version? Even if it isn't that could be what you notice.
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