Quote:
Originally Posted by Tcoat
No 600 is just about right. Mine drops to 600 after warm up and sits there as steady as a rock. Now it does do a slightly progressive drop from the 2000 rpm fast idle to about 1000 then 600 so if this is what you are seeing then it is normal. If it is dropping much below 600 you may have an issue though.
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So , I explain what happens in Italy to understand how fuel quality and RON may involve idle trouble.
In Italy BRZ is sold with warning for fuel refill
ONLY for RON 98 Minimum or Higher. RON100 means 88 MON or
94 AKI (CAN/US).
It' very difficult to find RON98/RON100 in Italy, besides it's usual to find RON95 (below the Ron ratio suggested by Subaru).
in certain self-adaptive management of ECU , fuel under ratio or with poor quality might involve the engine in idle trouble with some inconsistency around 738 rpm (standard lower limit).
Up to BRZ MY2014, Subaru Italy (Europe) assistance network upgrade the rom with @02G release coming from Australian release that solved in past this issue.
Since MY2015 (late 2014), some engine parts are changed (valve, spring) for new directions coming from emissions regulator (Euro6). More restrictive emissions rules with poor fuel ratio or poor fuel may produce this issue.
Try to refill with proper ratio (US ratio)
at least twice, run (travel) and verify if trouble/issue is.
When properly refiling (in Europe) in MY2015 this issue will disappear. Might be the same for US model.
Adding to this noise, in past (2015, early) Ecutek found a special function item in subaru's software that check in real time the efficiency of 2nd catalyst bank (U1402 engine warn, hoping to well remember the digits)
even if the setting is OFF, pretty deep inside the release . Running check of efficiency might involve some issue in idle.
Ecutek modified this feature in June both for dekat and non-dekat exhaust line to avoid constant check of it.