Muffler delete equals Rich condition

370z-09

I also did a Cain and muffler delete and buddy was behind me o. Freeway. When I down shifted and matted it he said it puffed out black smoke (rich) makes me wonder.... what was hour end result???

Staples

Bad gas... pulls out timing and adds fuel when it determines ping. Put some Shell or BP in the tank, then go back on the Dyno.

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'08 Infiniti G37s - Forced Induction Fed

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.