Road check the vehicle, if possible, before making any adjustments on the carburetor to improve performance. Dragging brakes, poor wheel alignment, low tire pressures, and other causes of undue friction should be remedied. Evidences of rust, leakage, dents, or clogging in the exhaust system should be corrected. Check the color of the exhaust for indications of an overrich mixture, or excessive oil consumption and compression loss. A rough running engine coupled with a strong odor of gasoline may result from a flooding carburetor. Improper engine temperatures should be corrected. Many faults may be detected by a visual inspection of the engine in operation. Remedy loose or disconnected wiring, leaking fuel and water connections, possible short circuits, and other faults. A further check can be made of faults, such as a slipping fan belt, by listening to the engine while it is operating in all speed ranges.