* Clutch: This is the most common culprit. If the clutch is slipping excessively (often due to worn friction material), the friction generates significant heat, leading to a burning rubber smell and potentially smoke. You might also notice difficulty shifting gears or a slipping sensation when accelerating.
* Brakes: Overheated brakes can also produce a burning rubber smell and smoke. This is more likely to occur after prolonged or hard braking, especially downhill. The smell will usually be more localized to the area of the brakes.
* Drive Belts: While less common, a severely worn or slipping serpentine (or other drive) belt can also generate heat and a burning rubber smell. You'll likely hear squealing or other unusual noises in addition to the smell.
* Tires: While not directly related to the *engine*, a tire rubbing against the wheel well or other component can also cause burning rubber smell and smoke. This will likely be accompanied by unusual noises and potentially visible smoke from the affected tire.
Important Note: Burning rubber smells are serious and shouldn't be ignored. Continued operation with a burning rubber smell can lead to significant damage and even a fire. It's crucial to stop driving immediately and have the vehicle inspected by a mechanic to diagnose and resolve the problem.
