6.0 PSD No boost, no power, and trouble codes!! Help? - Ford Powerstroke Diesel Forum
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Old 12-17-2008, 08:42 PM
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Exclamation 6.0 PSD No boost, no power, and trouble codes!! Help?

Hi all, thanks for looking. I have a 2006 F350 6.0 PSD. Recently I've been picking up on the same 2 codes: P0069 Manifold Absolute Pressure Barometric Pressure Correlation and P0299 Turbocharger Underboost. Even after clearing codes they come right back. Are the two related? They started about a month ago, at the same time. At freeway speeds, psi will hover around "normal" 7-10 psi, then drop to 0-1 psi. If I put my foot into the throttle, it takes a good 5+ seconds before it starts making any boost. Really annoying not having power when you need it. Anybody know what's causing this? The only mod I have is Edge Juice Platinum w/ Attitude installed about 4 months ago, otherwise stock exhaust and intake. I appreciate all feedback! 73k miles and i'm in Minneapolis, MN. Thanks guys.
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Old 12-17-2008, 08:47 PM
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First thing I would do if you haven't already is take the edge off and see if it still has the problem. If not then you know something is wrong with the box, If it still does it then you have one less thing to check. Good luck with it, i know some more knowledgeable people will give you better answers.
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Old 01-18-2011, 06:30 PM
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p0069 and p0299

I have those same codes showing now. CEL came on about 15 miles into the morning it was -15F. Seems to run fine. No power loss, not running rough, etc...
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Old 01-18-2011, 08:47 PM
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Step #1 to the original poster:

Monitor EBP_A, MAP and BARO parameters with a scan tool that can read live data at key-on/engine-off. All three should indicate atmospheric pressure with no more than 0.3 psi in variation (EBP_A: 14.3 psi, MAP: 14.4 psi, BARO: 14.2 psi etc.).

Step #2:

If any of the three parameters are found to be outside of atmospheric pressure, repair as necessary (MAP sensor reading likely low by information posted above).
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