Originally Posted by
Padgett
Good idea, I'll check. Have a good fuel pressure gauge. May be a day or two since rarely leave the house.
I agree, have been getting mixed and conflicting information all along. Only thing I am sure of is that long slow increase in the fuel trim at idle in gear only. Am "assuming" that as the STFT increases positive it means the ECM is adding fuel to correct a lean condition. At least that is my interpretation of "Self-adaptation of mixture formation for right (and left) bank of cylinders is at limit value (at idle speed). Enrichment over permissible limit"
I know we spoke earlier, I've had time to read over your codes and test, while it's possible my previous suggestion of swapping O2 connections might still be the fix I think you might have a vacuum leak here. I have seen the oil cap in the past cause the short term fuel trims to rise only at idle. Oil caps are like $7 at the parts store.