I have a 2010 Honda Civic with 73K miles. I’ve noticed that the car can get loud when driving and would like to ask help.
It has 4 Michelin Primacy tires from Costco put on at 45K. Not sure when the noise started, but now with my iphone I run a sound meter app and the sound level is 80 - 95db . Yeah, it’s not calibrated, but my wife’s Lexus reads about 75db worst case. so even just relative to the lexus, it’s loud.
The noise is loudest (95db)at around 57MPH and some other speeds like 47, 67 also. Other speeds in between these, it gets down to 80db.
There’s NO vibration at any speeds (so tires are balanced?)
There’s NO pull to either side when driving
There’s NO pull to either side when braking
There’s NO change in the sound level when putting the transmission in neutral (so it’s not a trans issue?)
There’s NO change in the sound level when the engine is idling at the speeds (so the sound is not tied to RPM level)
There’s NO discernible change in the sound level on different roads (so 57 MPH is loud on most any road).
The tires are wearing normally
Rotating the tires had no change in the sound level
What’s left? Tires and axle / bearings? Is there anything I can do to look for / test for to figure out the issue, short of a new set of tires? I guess I’ll have a mechanic look at the bearings?
Is tire noise usually tied to road speed in that pattern of getting louder at a certain speed, getting quieter above and below that speed, then get louder again at another certain speed?