Quote:
Originally Posted by andrewwynn
I just realized I never posted follow up. After about two days of driving the car apparently decided the new O2 sensors were worn in and would use them to control fuel flow. Absolutely nuts. My fuel trims went from max to something semi normal but with a weird caveat of the long term being negative with the short term being positive. I've read that this is indicative of MAF worn out. I've swapped with wife's and no change but no surprise both our cars are same age.
If PUA ever kicks in I will get a couple new MAF. At roughly 185,000 miles probably only 50,000 overdue. I did notice wife's short term trims also are pretty high though she still gets much better mpg than I do. Her car is on the disabled list with apparently some fuel supply problem that i would like to actually determine the actual problem before I use a parts cannon.
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If you add the two numbers together, they should be close to 0. As long as the long term is negative, the short term will be positive to try and balance the fuel trim out. If the long term ever becomes positive, the short term will go negative.