Quote:
Originally Posted by ZO6 Bryan
You're not too rich. You are too lean. Both of you need to monitor the fuel trims and the O2 sensors to see what's going on. If there isn't an air leak somewhere in the intake tube or a vacuum leak then the problem is in your tune.
If you are getting both codes, P0171 and P0174, then it is a problem that affects both sides of the engine. So it's unlikely both O2's fail at the same time. Same goes for a bad injector, not likely to be on both sides. Could be the fuel. Were your cars tuned with different fuel than you run now? More or less ethanol content?
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Using the same fuel from when it was tuned. No air leaks or vacuum leaks that I can find (used carb cleaner and sprayed around). Narrowed it down to MAFS or filter is still over-oiled (even though it's been 2 months)