My 2007, Honda Accord, 6-speed manual, 6 cylinder EX Coupe vibrates when I accelerate between the speeds of approx. 50-65 mph and then smooths out above that speed. Slightly higher when going uphill.
It only happens when accelerating and not if I’m just cruising without applying the power. My wheels and tires have been checked for balance and are in good shape. No bent rims, tires are in balance.
How many miles on the car? Bad motor-mounts can cause this, allowing the engine to move around…A bad wheel bearing is another possibility…Do you feel it in the steering wheel?
While on the subject of the wheel bearing, do you hear more noise from the front end than you used to? That can be an indication of a wheel bearing going.
My car has about 118,000 miles on it. I don’t especially feel it in the steering wheel. The vibration seems to be coming from the front. The left wheel also seems to make a progressive a whirring sound the faster I drive that may or may not be related.