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Old 12-11-2010, 03:00 PM
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high boost when cold

hi this is my first time posting. i have an issue and hopefully someone can help me out. i have noticed that when im driving to work on days that its not very cold above 32 degrees on fairly straight flat hwy my boost gage reads under the 10 pounds of boost almost on the zero just above and i get great fuel milage but when its colder 5 or 10 degrees colder on the same exact hwy at the same speed my boost is way high always running at around 10 pounds to about 12 or so and my fuel milage goes down big time sometimes losing about 60 to 70 miles on a tank of fuel. this is driving on cruse control at all times at same exact speed. my truck is a 2006 f250 i apreciate any help u guy have thanks in advance
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Old 12-11-2010, 05:13 PM
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it probably has something to do with the thickness/thiness in the air. if you had high boost all the time i would say you have a leak somewhere where do you live
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Old 12-12-2010, 04:27 AM
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i live in ontario canada i didnt have high boost all the time im only getting high boost over 10lbs at crusing speed when its cold 5-10 degrees under 32f and this is something new it didnt do this last winter or the winter before its just something else that im going to have to spend money that i dont have on this truck again
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Old 12-12-2010, 04:32 AM
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The colder the air is the easier it is to make boost. Cold air is less dense. Hence why intercoolers are used.
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Old 12-12-2010, 04:44 AM
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Quote:
Originally Posted by sinnful_46534 View Post
The colder the air is the easier it is to make boost. Cold air is less dense. Hence why intercoolers are used.
that is true so why is my boost so high when cold and my fuel milage go down? cold temps=more power with less boost=good fuel milage im not getting that im getting high boost very poor fuel milage engine seems to be working harder even on flat hwy and going down hill im still producing about 10lbs
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