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I ask the same question to GM and they told me that it is a cold motor piston slap and should go away once the motor is warmed up. The garage told me that it is normal and not to worry.

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โˆ™ 2006-04-02 21:54:21
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Q: What would cause a tapping noise in a 1999 Buick Century 3.1 liter engine?
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