I just replaced my original AC Delco O2 sensor with a new Denso. Ever since my trims jump around from very rich to very lean. Can someone more knowledgeable than me take a look at my scan and tell me if my O2 sensor is on the fritz? When I look at it in Chart View it doesn't look right.
2.8/3.0/3.2 Pulley/ZZP CAI/1.6 HS Rockers/Hi Energy Comp Cam 76-802-9/LS7 Lifters/ZZP Stage 2 Intercooler/TOG Headers/Triple Edge Performance Stage 3 Transmission/3.29 Ratio/NGK TR6ix IRIDIUM .40 GAP/ZZP Fuel Rails/ZEX 100 shot NOS/GMPP Sway Bars/KYB Adjustable Struts/Power Stop Performance Pads/Rotors
That is how a narrowband O2 sensor is designed to operate. It toggles voltage once the car is running at stoich. The amount of fuel correction it took to get to that point is the fuel trim.
I understand that---but if you look at my scan my trims go from LTFT's of -10 to -12 rich to 2 to 3 lean. Before I installed the Denso I did not have that problem. I have had a SEL appear the last 2 weekends, P0133 for slow response Bank 1.
Last edited by coachcrow56; 02-15-2014 at 08:22 PM.
2.8/3.0/3.2 Pulley/ZZP CAI/1.6 HS Rockers/Hi Energy Comp Cam 76-802-9/LS7 Lifters/ZZP Stage 2 Intercooler/TOG Headers/Triple Edge Performance Stage 3 Transmission/3.29 Ratio/NGK TR6ix IRIDIUM .40 GAP/ZZP Fuel Rails/ZEX 100 shot NOS/GMPP Sway Bars/KYB Adjustable Struts/Power Stop Performance Pads/Rotors
Just to update this post---the problem with my fluctuating fuel trims was the fuel pump---it never failed but it would not keep consistent pressure. Once I replaced it, my trims are steady and the car runs great.
2.8/3.0/3.2 Pulley/ZZP CAI/1.6 HS Rockers/Hi Energy Comp Cam 76-802-9/LS7 Lifters/ZZP Stage 2 Intercooler/TOG Headers/Triple Edge Performance Stage 3 Transmission/3.29 Ratio/NGK TR6ix IRIDIUM .40 GAP/ZZP Fuel Rails/ZEX 100 shot NOS/GMPP Sway Bars/KYB Adjustable Struts/Power Stop Performance Pads/Rotors
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