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Under normal starting conditions the starter has an even sound to it, however ever since I installed my tuner subsequent starts result in an acceleration in the starting noise.
The initial start in the morning is fine, but if I go somewhere and shut it off, and start it again the accelrated starter noise happens, then the next morning the starter noise is normal again for the first start.
The tuner install could be consequential. I installed my coolant filter then a week later I developed a coolant leak completing unrelated to the filter install.
Return to the factory tune and see if it goes away. Process of elimination. If not replace the starter be4 it leaves you somewhere that you don't want to be.
It *DID* leave me stranded but re-started an hour later while waiting for a tow truck. From the research on FTE it seems like a classic HPOP leak. Won't start/hard start when hot.