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P0171/4 sys too lean bank 1-2


2006crewcab

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I have a 2006 silverado 1500 5.3 with 96000 miles. Last night i got codes p0171 and p0174. New to me so i came here for answers. Mods i have done are airaid jr cai, Airaid air filter, edge evo ht programmer, Magnaflow exhaust, and a JET mass air flow sensor. The 2 newest are the jet air flow sensor and the airaid air filter. Had the intake tube and programmer for about 2 years now. thanks in advance for any help.

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The biggest thing that I know that causes lean conditions is air leaks around and up to the intake. Go back through the entire intake system and make triple sure you have everything connected and tight. I've accidently left things loose before and it will cause problems. The main one I see is the tube to throttle body clamp doesn't get seated and tightened correctly and allow extra air into the system.

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I talked to a guy at the firehouse and he said his wifes truck does it when it gets cold out. Maybe the winter mix fuel? Didnt do it till after i filled up last night. Was almost empty which i know isnt good on the pump and whatnot but is there a possibility that it could be the gas? Or maybe fuel filter is clogging up?

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