Q: My car is making a vibrating/grinding sound.

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My car has been making a vibrating/grinding sound for a few days now. The sound is similar to that of a diesel engine needing to shift gears but less intense. It happens when I accelerate but goes away at high enough RPMs. I don't know if it's the crankshaft or if the cold weather is warping something. Thanks for any help.

Josh K.

My car has 122000 miles.
My car has an automatic transmission.

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