Road check the vehicle, if possible, before making any adjustments on the carburetor to improve performance. Dragging brakes, poor wheel alignment, low tire pressure, and other causes of undue friction tend to retard engine performance. Evidence of leakage, dents, or clogging in the exhaust system can cause trouble. Check the color of the exhaust for indications of an over-rich mixture, for 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.