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Re: P0170 diagnosis
Posted to Technical Discussion Forum on 7/17/2023

When I was checking for back pressure at the pre cat O2 port I covered the tail pipe exit with a rag and got about 5 psi. Only one half psi at idle and almost 1 psi at 3000 rpm. With the rag off. I'll check again but the manifold and cat look solid. The exhaus... Login to read more.