What are the diagnostic methods for car faults?

[AshleyRose]

Car fault diagnostic methods are: 1. Touch method: Diagnose overheating or looseness of mechanical parts, and pulsation of high-pressure fuel pipes. 2. Sensory method: During driving, the car pulls to one side, the turn signal doesn't light up, the exhaust pipe backfires or emits black smoke, or a tire bursts. 3. Trial method: If a cylinder in the engine is not working properly, you can use the method of cutting off the spark or fuel supply to each cylinder one by one to identify the issue. 4. Comparison method: Replace and compare with new spark plugs or injectors against the original ones. 5. Testing method: If the car wobbles or the tires wear unevenly, specialized tests are needed to identify the cause using instruments and then eliminate the problem.