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Re: 04 avalanche 5.3 running lean on bank 1
what was the exact code for the 02 sensor? it might be a plug that has bad gap setting, could be an injector clogged/faulty. the possibilities are high right now, and trying to narrow it down. a white spark plug end would mean lean on that cylinder, if on all 4, would mean something wrong on that side of fuel rail....either all 4 injectors bad at same time(doubtful and you would have other driveability concerns it would seem), or a clog in the rail on that side, or some sort of electrical problem over there. awaiting more info about the plugs. just for record, how does the truck run, any performance issues, or just the light?
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Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.
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