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activeseven, From my experiance with fuel injection systems the ECU performs the 'choke' function on a cold engine by increasing the injector duty cycle, if this is what you're thinking.

The big problem for cold starts in the 10% ethanol gas. My '04 became difficult to start when the change over occured in my area. From what I've learned the ethanol percentage is maxed at 10%, but sometimes is mixed at a smaller percentage...when my '04 cold starts easily I'm guessing the percentage is less than 10%. The long term fuel trim can have the CO percentage increased for easier starts, which I haven't bothered with.

Brad
 

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activeseven, I don't know positively as I haven't done it, but it'll be more like to 3-3.5%. IIRC, my '04 is just under 3% CO according to the dealer's tool.

Brad
 
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