The never ending lean code - Page 2 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 03-19-2017, 08:44 PM
Olejbrown Olejbrown is offline
Junior Member
2006 Chevy TrailBlazer LT
Silver 4.2L I6 2WD
Join Date: Mar 2017
Location: Mooresville NC
Posts: 5
Well I played with it my bank 1 O2 voltage never got above .8 and that was being pretty aggressive with the pedal. I put in a new fuel pump today (that's a real treat) and I am hitting new heights at .9 and a regular .8 so it is safe to say I do have better fuel delivery now one odd thing or it may not be odd is I did get a hell of a lot of lean codes after I initially put the new pump in I figured this might be because of air in the lines or the amount of time it might take that giant filter to saturate. After 45 minutes to an hour of driving though the codes stopped coming and my 02 voltage started rising when I gave the engine more throttle.
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Old 03-19-2017, 09:41 PM
AWD V8's Avatar
AWD V8 AWD V8 is offline
Senior Member
2003 GMC Envoy SLT
Indigo Blue Metallic 5.3L V8 AWD
Join Date: Dec 2014
Location: Surrey BC
Posts: 547
If the pump has been replaced and you cleared the codes, you shouldn't get any lean codes, if the pump was the cause of it running lean. The fuel system is bled very quickly, no air will be in it by the time you get it out of the driveway.

As far as highs & lows, the O2 voltage does not regularly hit the extremes of its range.

How does it drive now? Does it have good power at WOT? What voltage do you have at WOT?

What are the short term fuel trims while cruising?
I was planning on procrastinating today but I think I'll do that tomorrow.
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