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Message: [QUOTE="IHPowerstroke7.3, post: 1429816, member: 7642"] I agree with the efficient cooling system, but the EGR system runs off the secondary cooling system. Only difference it could make is that the secondary radiator doesn't build as much heat so there is less heat being transferred (through air flow) to the primary radiator. Its not really that cold out yet, but generally when these things are cold they start up running around 8-900 rpm. When you put your foot on the brake and shift out of park it will drop to 6-700 rpm. If its really cold out, they will idle in the 1150 range in park. If you move them before they warm up, sometimes they are hard to stop because the engine over powers the brakes. Ford Hotline didn't confirm or deny a calibration change but with all the recalls i'm sure they changed something. Even the calibration of the VGT is different, they aren't closing the vanes as much which would create less heat as well. While I agree these are totally different beasts than the 7.3's, 6.0's and 6.4's obviously something happened. Customer that I have has had the truck since new and its a 2012. [/QUOTE]

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