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Originally Posted by m3cole
Having this same issue with my car. Suddenly went into limp mode. I had it towed to North Raleigh Performance in NC where I also work. Went though full ista test plan and said the IAC was faulty, I replaced this last night and turned the car on and same issue. Also went through ista test plan on throttle actuators and they were but swapped them bank to bank just to see if may something changed. Cylinder misfire for bank one entire bank. Car will turn and and is fine for half a second and goes back into reduced power mode. Swapped actuators, O2 sensors, and checked injector pulsing and everything checks out. Going to compression test at the end of the day and see if we can find anything. This car really tests my patience lol
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Quick update. Compression test showed zero compression in cylinder 6. Broken valve spring is the culprit. Just have to see if the valve is bent or if we can get away with putting a spring in and calling it a day.