- Symptoms: Tapping sound disappears once the engine warms up. Engine knocks or rumbles at low RPMs.
- Solution: Check and correct the oil level. Refer to the owner's manual for recommended oil type and amount.
2. Worn Lifters or Cam.
- Symptoms:
- Persistent tapping or clicking, even after the engine warms up.
- Reduced engine power and performance.
- Engine misfires.
- Solution: This typically requires professional mechanical repair, as it involves accessing and replacing faulty lifters or cam components.
3. Exhaust Leak:
- Symptoms:
- Tapping or popping sound is more pronounced when the engine is under load or acceleration.
- Engine noise is accompanied by a noticeable smell of exhaust gases.
- Solution: Locate the source of the exhaust leak and repair or replace the damaged exhaust component.
4. Bad Valve Adjustment:
- Symptoms:
- Uneven engine idle, with some cylinders misfiring.
- Tapping or clicking sound, especially at higher engine speeds.
- Solution: Adjust the valve clearances according to the vehicle's specifications, which may require specialized tools and knowledge.
5. Faulty Fuel Injector:
- Symptoms:
- Irregular engine idle and misfires.
- Engine hesitates or stumbles during acceleration.
- Tapping or clicking sound that varies with engine speed.
- Solution: Identify and replace the faulty fuel injector, ensuring proper fuel delivery to all cylinders.
Remember that diagnosing engine noises can be challenging and may require specific diagnostic tools and expertise. If the tapping sound persists or is accompanied by other symptoms, it's best to consult a professional mechanic for a thorough inspection and repair.
