Hi Ron, I have a 2001 Ranger XLT and replace the engine with a factory refund long block. The engine sounds like a diesel. I have had it back to the dealership 3 times where the change 2 timing sensors cassette, then the belt pulley, tensioner and belt, the last time they change the crank pulley. It still sounds like a diesel. Definitely and internal noise, I can determine that with a stethoscope. Any ideas??