What Causes the Tapping Sound After Starting the Car?

[McAndres]

After starting the car, the tapping sound is caused by valve noise. The "tapping" sound from the engine after ignition is the noise from the valves, especially noticeable when starting a cold engine. This happens because the oil pressure hasn't built up yet, and the valves aren't properly lubricated. The sound usually subsides after a short while. Below are explanations of other engine noises: 1. Engine Belt Noise: The engine belt produces a "squeaking" sound. Belts such as the alternator belt, air conditioning belt, or power steering pump belt may be too loose or too tight, or they may have aged. Adjusting the belt tension, applying grease to the belt, or replacing the belt can resolve the issue. 2. Engine Misfire: If one cylinder isn't functioning, the engine becomes unbalanced and produces abnormal noises, often accompanied by severe shaking, lack of power, and other malfunctions. Possible causes include faulty ignition modules, spark plugs, or fuel injectors, which can be fixed by replacing the corresponding parts.