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My theory is that when tuning the ECU, Toyota accurately mapped a temperature range for Japan (we'll say <86*F). So with a common heat soak of +10-15*F on the intake air, they have it mapped properly for <100*F and I don't think I've seen it happen on temperatures that 'low'. However, once you start getting into the higher temperatures, the ignition timing retards back more and reaches a point where the ECU can't hold the rpms as steady at idle so it just does this balancing act instead.
If this is true, then it's just a matter of Toyota/Subaru playing with those mapped values to alleviate it. It could be that they knew about it, felt it wasn't a major (problematic) issue and can fix it once the car is out.
I'd love to hear how you guys in extreme heat (TX/AZ) have been with the car at idle.
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2013 Scion FR-S Firestorm Red MT
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