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Old 01-02-2013, 01:44 AM   #7
Pickler
Scooby Newbie
 
Member#: 301247
Join Date: Nov 2011
Location: Toronto
Vehicle:
09 Impreza 2.5i MT
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well for me it happens even when car is hot, and as i said since day 1. i also noticed the same when i rented an impreza in Hawaii which was a sort of hot place. from my experiments while monitoring oil solenoid duty cycle, the howling occurred at the same time i got the lights. so this might be related to high lift Cam switching lobes (anywhere between 1500-3000rpm at over 80% engine load).

this is considering that we are both hearing the same sound.
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