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  1. 6.5L Diesel Engine
    Hi all. Have a 1997 6.5 dually, F engine. Code P0238 shorted high. I have borrowed a Tech II and am looking at real time data. I have 29 psi boost registering at idle. My question for the gurus is 2 fold. Where does the 1997 truck get its ambient pressure reference from. I remember older trucks...
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