Why does it make noise when starting a cold engine?

1 Answers
SanLola
07/29/25 8:29am
The reasons for noise during cold engine start are: 1. Engine belt slipping; 2. Severe wear of starter and flywheel; 3. Valve train malfunction; 4. Excessive clearance between hydraulic components and valves in engine cylinder head; 5. Timing chain failure; 6. Aging drive belt; 7. Three-way catalytic converter malfunction; 8. Engine temperature too low. Precautions for cold engine starting include: 1. Avoid prolonged idling to warm up the engine as components aren't fully lubricated and operating temperature hasn't been reached; 2. The fuel injector automatically increases fuel injection to raise RPM, normal driving can commence after engine reaches optimal operating temperature.
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