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08-06-2012, 09:07 PM
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Registered User
Join Date: Dec 2009
Location: Wichita, ks
Posts: 59
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Code p0171 & p0174
Hello fellas,
I'm having trouble figuring out what is causing these codes p0171 & p0174. I have a 2004 lq4 with a 4l80 in my 72 Cheyenne. I have replaced the intake manifold gaskets and could not find any leaks. I'm getting pretty frustrated with my research, so any input would be greatly appreciated. Could it be a weak fuel pump or sticky injector causing this? I have order a new relocating fuel tank with an in tank fuel pump from Boyd's aluminum tanks. Thanks. Sergio Posted via Mobile Device
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