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Just bought F350- grinding noises?
I bought a 2001 F350 with the powerstroke and 6 speed last week. It has 211000 miles, and I had it checked out by a mechanic, and every thing seemed to be about perfect. Since I picked it up, I've probably driven 400 miles with no issues. It starts fine, has power, ect, but just starting today, It makes a grinding noise at various RPM range. In neutral, it starts grinding right at 2000 rpm, but when you are driving down the road, it will start grinding at 1000-1500 rpms. My first guess is that it's the turbo, but I'm not sure. How would I go about diagnosing these issues?
Also, this morning, before the truck started making the new noise, I was idling the truck while jump starting a backhoe, and even with the truck at operating temp, the rpm's were swinging between 500 and 1100 rpms. Is this normal?