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  1. Cams/Heads/Valvetrain
    A substantial clunking has started when the engine is idling but goes away when the engine speeds up. And when the engine is turned off, there is generally one last clunk. It is on a 1990 Buick Lesabre and the noise is in the area of the power steering pump and the serpentine belt tensioner...
    clunking engine noise idle noise valve noise
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