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Mazda CX-7 Noise and Vibration
I have a 2008 GT AWD (bought in in April) and it is exhibiting a "harmonic vibration" throughout the car at highway speeds. It is worst between 55 and 80 mph. It smooths out, but is still noticeable between 80 and 110 mph.
Clearly a difference between "coasting" and under power... worse under power/torque. After 100 miles on the interstate... I feel like I'm sitting on a massage seat (
Dealer has tried:
Tire rotate and balance - nothing odd found... no help.
Replacing the drive shaft - a 3-piece monster... no help.
I have tried simulating the RPMs in different gears and the vibe only appears at highway speeds not highway RPMs. Obviously, can't easily test gears lower than 5th or 6th gear at 75 mph.
Oh, and no noticeable vibe in the steering wheel specifically... allignment seems spot-on... it's the whole car that vibrates.