Join Date: Jun 2008
Location: Brampton, Ontario, Canada
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First and foremost, if you have the capability to monitor BARO, MAP and EBP (all three in psi), that would be the first course of action. At key-on/engine-off, all three should indicate atmospheric pressure (about 14.7 psi in my neck of the woods), and all be within 0.3 psi of each other. If the ambient temperature is that cold, you might have an EBP tube freezing up with ice inside. But once the engine is started, it doesn't take long for it to melt, so this should be a non-issue. Nonetheless, when the engine is started, you should see a slight increase in MAP and EBP readings while BARO will remain constant throughout the entire operating range. If you are seeing MAP readings all over the place, the first thing I'd do is remove the hose, blow it out to remove all carbon that could be lodged in it. Ditto for the MAP sensor brass fitting in the intake, remove it and clean off all carbon deposits. If doing all this still results in MAP readings all over the place, change the MAP sensor or look for problems with your turbo.
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Ford Diesel/Senior/Master Tech who placed 2nd overall in Ontario on the Fix-It-Right-First-Visit score for 2010
....who works at a dealership that now employs SOME half decent looking female employees since they overhauled most of the administrative staff
....but STILL loves hot women with big boobies
....and STILL hates working on E-Series with 6.0L