What causes abnormal noise when starting the engine?

1 Answers
OPiper
07/29/25 12:43pm
Possible causes of abnormal engine noise include: 1. Engine knocking: The "clanking" sound occurs when the piston skirt impacts the cylinder wall during operation, requiring replacement of the engine's four matching components; 2. Intake/exhaust system noise: Intake manifold leaks produce sounds during idle that intensify with RPM increase; 3. A "hissing" noise indicates cooling system issues causing engine overheating; 4. A "squeaking" noise suggests engine belt slippage; 5. A "clicking" noise results from engine carbon deposits.
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