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Old 11-03-2008, 09:55 AM   #18 (permalink)
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Join Date: Jan 2008
Location: Mirabel, QC
Posts: 1,672

The Guzzler - '08 Hyundai Elantra GL
90 day: 33.12 mpg (US)

Got Soul? - '11 Kia Soul 2U
Thanks: 35
Thanked 86 Times in 57 Posts

On my TDI, timing is pulled back with higher intake air temps for NOx reduction purposes. If I unplug the IAT sensor, the ECU assumes -15 F IAT (vs ~90 F) and I can see the timing being adjusted by 2 degrees as I connect and disconnect the IAT sensor. I too blocked airflow to the IC, but instructed the ECU IAT was cold, and my mileage did not go down.

Your KIA is probably a much newer car than my 99 and there might be other emissions systems affecting how it reacts to intake air temps. A couple degrees less advance should really not affect mileage all that much alone.
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