What Causes Abnormal Noise During Cold Start?
1 Answers
The reasons for abnormal noise during cold start are: 1. Engine belt slipping; 2. Severe wear of starter and flywheel; 3. Valve train malfunction; 4. Excessive clearance between hydraulic lifters and valves in the engine cylinder head; 5. Timing chain failure; 6. Aging of drive belt; 7. Three-way catalytic converter malfunction; 8. Engine temperature being too low. Precautions during cold start include: 1. Components of the starter are not fully lubricated, and since the engine hasn't reached optimal operating temperature, avoid prolonged idling to warm up the engine; 2. The fuel injector automatically increases fuel injection to raise RPM, and normal driving can commence once the engine reaches optimal operating temperature.