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Re: 2006 expedition P0455 and no leak
Posted to Technical Theory Forum on 2/26/2018 1 Reply

You never saw a purge valve fault code because, to the PCM, the problem looks identical. Shut the vent valve, and open the purge valve until a specified vacuum level is achieved, then shut the purge valve too and measure the vacuum decay. If that specified vac... Login to read more.

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