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Old 02-17-2016, 12:38 PM   #58 (permalink)
EcoModding Lurker
Join Date: Feb 2016
Location: New Brunswick
Posts: 4

Loosey - '04 Chev Optra LS
90 day: 24.44 mpg (US)
Thanks: 3
Thanked 1 Time in 1 Post
With the TPS showing "closed" the IAC valve is most responsible for high idling, not increased injector output. It would have to get very lean before the O2 sensor would tell the ECU add fuel. I notice other cars not returning to idle. Did anybody check fuel rate or injection while encountering that condition, because I still wonder what all the ECU does for outputs in that condition..?
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