My truck has always blown black smoke when under acceleration with the chip in performance tune, In stock tune never any smoke. On Friday when coming up to the river towing a boat I was in a 60hp tune all temps were good, I do have a scan gauge that's programmed to show coolant temp and it was showing warmer than what its usually at, it was showing 190-200f usually in the 170-180 range. It was 110f when towing around 2500 uphill when i got on it to pass someone and that's when I saw the grayish/black smoke. When it cooled back to the 180 range and when I got on it again it was blacker smoke again.
Anything I should be concerned about?
Truck has 94k on it