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Re: Hummer P0171 - Check everything
Posted to Technical Tips Forum on 3/27/2018 4 Replies

nice write-up robert . good use of ol' smokey .

now the question is: did you document fuel trims "before and after" ? i'm wondering if the exhaust manifold was actually contributing to the lean issue .

now obviously it needed to be replaced , not criticizi... Login to read more.

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