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In consistent knock at idle

ShaneCaldwell
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ShaneCaldwell New Member

ShaneCaldwell

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I have a 2015 Chevy Silverado 1500 4x4 (5.3) When the engine is fully warmed up (driven for 15-30) there is this very inconsistent harsh knocking sound when at idle (no load). BUT the part that stumped me is that it continues for about 30 sec after truck is completely turned off. Any ideas on what this could be?

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