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P0171/4 sys too lean bank 1-2

2006crewcab

By 2006crewcab
in Ask A GM Technician

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2006crewcab Enthusiast

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.

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
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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.

2006crewcab Enthusiast

2006crewcab

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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?

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
Posted

I guess that is a possibility, you could rent a fuel pressure gauge and have the pressure tested, but I think the computer would account for the lesser fuel. However, I'd still check the intake as it's real easy and free to check.

2006crewcab Enthusiast

2006crewcab

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Yeah i kinda went over it last night real quick but will have it off again tonight to install throttle body spacer. Guy at wotk talked me into gettin one so we shall see if tht makes a difference. Knowing my luck its something thats gonna cost to have it fixed.

txab Senior Enthusiast

txab

Posted
Posted

Throttle boy spacer will do nothing for you except lighten your wallet. Your friend at work is dreaming

 

Check intake gaskets

2006crewcab Enthusiast

2006crewcab

Posted
  • Author
Posted

Throttle boy spacer will do nothing for you except lighten your wallet. Your friend at work is dreaming

 

Check intake gaskets

I know i hurd everything and tried telling him but he wouldn't shut up

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