Quote:
Originally Posted by eriktherod
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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Here's a pic of Dash Command running on my phone at idle showing timing and ambient temps.
Sitting at the same red light, just seconds apart (amount of time for screen to change when tapping ambient temp) and this is what the intake air temp showed.
Quote:
Originally Posted by mike2100
From what I read of his posts he just raises the idle, usually a band-aid solution to a symptom rather than the problem.
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I have 400-500 miles or so on the tune and it hasn't happened once since the tune. It has worked so far and hasn't thrown a CEL so until it does, I'm considering it fixed.
Ruskymx