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Re: 7.3L diesel HPOP testing
Posted to HD/Fleet Forum on 5/28/2019 6 Replies

On a federal emission truck, it should be less than 1800 PSI during the high RPM test. Your reading could signify oil aeration, or the PCM trying to compensate for another problem, like low fuel pressure. A high to low code on an injector, with that injector b... Login to read more.

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