#2 bank running lean

Asked by Rug40 Apr 13, 2019 at 05:13 PM about the 1999 Chevrolet Silverado 2500HD Extended Cab 4WD

Question type: Maintenance & Repair

I have a 98 Silverado 2500 4wd. Shortly
after purchase ( used) it developed a
miss. Engine light came on finally, left
bank running lean.I have replaced the
injectors, complete tuneup,both O2
sensors post catalytic converters,egr,fuel
filter. After R&R of 02 sensors,seemed to
run good for a couple of days then back
to same o. R&R 02 again,same results.
Can someone tell me what would be
burning up the 02 sensors?? Thank you

2 Answers
27,570

oilyspill answered 5 years ago

The basics for p0171 and p0174, miscalibrated maf sensor exhaust or intake vacuum leaks , commonly a lower intake leak low fuel pressure/volumn I did look up fuel pressure, 5.3L, 55--62 psi, so if right about in the middle, should be fine as far as pressure. good luck

Mark helpful
27,570

oilyspill answered 5 years ago

Just to add, the common causes for those two codes,I listed them on separate lines. The site jammed it altogether. My chevy tech manual says replacing 02 sensors to fix this problem is a common misdiagnosis, that's what it said. Just trying to help. Don't blame me for the info, I just looked it up. Might be another issue?

Mark helpful

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