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A rattling noise when starting the engine can be caused by several factors, including a loose or worn timing chain or belt, which can create a metallic sound. Additionally, insufficient oil pressure at startup might lead to noisy hydraulic lifters or valvetrain components. Other potential causes include loose engine mounts, a failing starter motor, or issues with the exhaust system. It's important to diagnose the source of the noise promptly to prevent further damage.

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1mo ago

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