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International Automotive Technicians Network
Re: P0171,P0174 could use some direction
Posted to Technical Discussion Forum on 12/5/2023

Sam, I think that 5.3 has a conventional-type PCV valve that sits in a bushing in the valve cover. With the engine idling, stop the PCV flow [however is most convenient] while watching the fuel trims.

I would also disconnect every vacuum connection to the in... Login to read more.