A/F ratios being off is a tuner issue. If the tune was ran too long with A/F's off, then that could cause the #8 to fail. If the mechanic was truly scared about an A/F problem, he should immediately to a compression check of the cylinder. This will tell you if it has failed or is about to fail. If the PCM has been flashed, you are going to have a rough time at various Ford dealerships getting it covered under any type of warranty, if one still exists on your 2011. Sorry to hear this is happening. I know first hand.
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- Jeff
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2013 GT Premium|Brembo|MT82
ProCharger P1SC Stage 2|Full Suspension|New Plans: NA CJ Intake Manifold/OR H Pipe/3.73 Gears
Road Raced|Auto-X'd
Drag Raced|12.4s @ 119.7
Texas Mile|1/2 Mile: 140.3|1 Mile: 166.4|She had more in her!
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Threaded Mode
