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Re: Idle until almost dead
There is no idle air control (IAC) valve on throttle by wire equipped engine like the 4.2L. The TBW system (self) actuates the throttle to maintain idle speed on a cold engine. I'd do a throttle body cleaning if you are experiencing idle issues. The roaring sound on a cold takeoff is the fan clutch. It's fine provided the roaring stops after that first takeoff.
G/luck
Joel
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2016 Subaru Forester 2.5i base CVT
2016 Nissan Quest SV
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