Ook so 08 chevy suburban 5.3l flex (lc9 i believe)
Ggetting codes consistently for p0172 and p0175 and now a p0455 evap. First 2 are rich for each bank aas you know I am sure.
Rrun down of parts: this week: thermostat and ECT ssensor. 6 months ago 4 new o2 sensors and both ccats replaced. About a year ago: vent valve, 8 ffuel injectors, plugs, MAP sensor, updated valve ccover with new PCV valve, new TPS sensor, throttle bbody removed and cleaned, MAF sensor about 1.5 years ago and near 6 years ago the purge valve. The p0172 and p0175 codes have come on after resetting after each repair sometimes at the same time sometimes 1 before the other but always both in short order. As for replacing about 80% of those parts had to do with other codes that came up while some of it is me trying to pinpoint this extremely frustrating issue. Fuel pressure, load, air volume spark all of the usual numbers seem to be fine within norms except fuel trims as far as I can see. Short term isn’t too bad, still running negative to take away fuel but usually 1-5 for an average. LTFT though thats where I get up to 10-15 and at some points 25 negative. I have a semi advanced scan tool (launch x431-v+) but beyond maybe the purge valve going bad again or the vent canister itself i am at a loss. Any ideas!?
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