Muffler delete equals Rich condition

cavemancan

Please re-read the original post...I implied multiple fill ups but to be more clear...I have filled the tank more than a dozen times since then and the bad mileage is still an issue.

I had my brother (A master ASC cert mechanic) look at it and he had software to look at the O2 sensors and he noticed 3 out of the 4 exhaust sensors were reading pig rich (I.E. wide open) the moment the accelorator is pressed. I am surprised the car has not flooded. I am going to ask the dealer to reflash the ECU.

Another idea: what if the knock sensor is loose? Would that not cause the ECU to dump more fuel since its getting a false knock?

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Mazda Rx8 MT Titanium - SOLD!
2009 370Z T-Sport MT Black - Takeda Intake, Swift springs, Rear Camber kit, SS B Lines, FI Exhaust, Z Speed CMAK Flywheel/Clutch Kit, Stillen Brake Cooling.