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Message: [QUOTE="Rule12b, post: 1528092, member: 21194"] So, I cannot seem to diagnose, much less solve a repeating issue with my 2015 F-350 6.7. Whenever it rains, I start throwing codes, namely P0687 and P0471, with an occasional P0108. The boost gauge pegs at start up and my EDGE shows 12 psi even when the motor is off. The manifold pressure shows 24 psi with engine off while actual barometric is 14.9. Of course then when it dries out, all returns to normal. I've both cleaned, then replaced the MAP. only to have this reoccur. The exhaust pressure sensor I've cleaned but not replaced. It seems fine. I have to think somehow water is getting into the circuit and shorting it but I cannot figure out where. I do not think it is any of the tunes I'm running and reloading them doesn't solve any problems. I've googled endlessly and see some of these problems repeated but mine is so moisture specific I'm wondering if anyone else had this issue and figured out where it was coming in. Any help is appreciated. . . [/QUOTE]

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