A continuous humming or roaring noise in a 2001 Land Rover Discovery Series II can be caused by several factors. Common culprits include worn wheel bearings, which can create a noticeable noise as the vehicle moves. Additionally, issues with the differential or driveshaft, such as worn gears or joint components, can also contribute to this sound. Lastly, tire problems, like uneven wear or damage, may produce a similar noise, so it's essential to inspect these areas for potential issues.
A humming bird
idle air control valve
Wheel bearing.
The fuel pump is engaged.
Certain types of tires may cause a brief humming noise after your initial acceleration. The transmission may also cause a brief humming noise.
The roof rack or lauggage rack may be catching wind and vibrating. If it has adjustable cross members slide them toward the back of the van and see if that helps.
I have a whirring sound in my ears Can you tell me what is causing it?
Wheel bearing
That will be the engine. A necessary component in a motor vehicle.
Low fluid level.
bad wheel bearings
Could be a bearing going bad.