Start with the complaint
Record speed, road surface, steering input, throttle position and whether braking changes the sound. Do not diagnose from “it hums.”
CHASSIS · 2002 · WHEEL BEARING
2002 Firebird Wheel-Bearing / Hub Noise Diagnosis
A hum or growl that follows road speed still needs isolation. Turning the steering wheel, brake application and tire condition can change noises that owners describe the same way.
APPLICATION: 2002 Pontiac Firebird / Formula / Trans Am. Use factory wheel-bearing inspection procedures and the actual ABS/TCS configuration on the car.
Separate tire noise
Inspect tread for cupping, feathering and uneven wear. Rotate or otherwise isolate the tire/wheel contribution before condemning a hub.
Inspect the bearing/hub
Follow the factory wheel-bearing diagnosis for looseness, roughness and abnormal operation. A quiet bearing with no measurable fault should not be replaced just because the sound seems to come from that corner.
DO NOT REPLACE THE HUB YET
First exclude tire noise, brake contact and driveline/rear-axle noise. If an ABS complaint is also present, diagnose the wheel-speed-sensor circuit rather than assuming the bearing itself caused the warning.
FPV RULE
OBSERVE → MEASURE → ISOLATE → PROVE → REPAIR → VERIFY. A symptom is a starting point, not a parts verdict.
DO NOT REPLACE YET
Do not replace a hub because a road-speed noise seems to come from one corner. Use the page’s load-change, tire/brake and hub checks to separate bearing noise from tire, brake, CV/driveline or contact noise.
PARTS VERDICT
The hub earns replacement only when its bearing/signal condition is proven. Repair the actual tire/brake/contact source when the hub remains sound.
REPAIR → VERIFY
Road-test through the same speed/load transition, confirm the noise does not return and verify any related ABS wheel-speed behavior remains normal.
FPV DIAGNOSTIC RULE
SYMPTOM → TEST → ISOLATE → PROVE → PARTS VERDICT → REPAIR → VERIFY. A code, symptom or commonly failed part is not proof by itself.
AFTER THE FAILURE IS PROVEN
Use the proven failed branch—not the original symptom—to choose the replacement. Go from diagnosis to the Parts Verdict →