1998 Lexus SC400 Base 8 Cyl 4.0L
Steering & Suspension
I hear a roaring sound when driving, whose frequency depends on speed, not engine rpms. What is this?
When driving at either around-town or highway speeds, I hear a noise that soulds like tire roar. Going straight - roar. Turning right - roar. Turning left, even very slightly, the roar disappears. There is a change in the tone with speed, but not with engine rpms. It sounds like it's coming from the front. The car has 120k miles. At 90k miles, all of the running gear of the brake system was replaced (rotors, calipers, pads).
Most likely is a bad fron wheel bearing. Raise each front tire off the ground and spin them by hand and listen. Do one at a time and compare. Check for any looseness in the hub while wiggling the tire from top to bottom.