Every now and then, our Volvo (2003 XC 2.5t, 200,000 km, Auto) will rumble. At low speeds it isn't noticeable, but as the car accelerates the rumbling becomes more pronounced. Bringing the car to a halt and then resuming the journey clears it. Backing off the gas, and braking (without coming to complete halt) have no effect.
When the car first attains the speed at which the rumble is noticeable, it is similar to the labouring of a car with a manual transmission in too high a gear, but if I continue to accelerate, it becomes stronger.
Since buying the car in June of this year, the only significant work performed was the replacement of the timing belt and water pump.
Ideas?
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