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06/02/2022 11:37 am
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With my el cheapo scan tool, I see my short term fuel trims are close to zero while the long terms are -8% and -6%. I've only driven the car 500-800 miles per month the last few months with 30-40% in town with quite short trips (1-4 mile trips in a small town). Does that kind of usage contribute to those long term trims? Or is this more pointing to leaky fuel injectors, dirty MAF, or...? O2_1 voltages look sinusoidal and O2_2 voltages are steady @.7V. No codes.
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06/02/2022 3:41 pm
O2 sensor, wires, coils, plugs,maf,injector. Your upstream O2 should be going up and down not stay steady. The down stream should be fairly steady. Google properly working o2 sensor graph and look at images
