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What could cause a knocking sound on a 1995 Nissan Pathfiner when the engine hits 3000 RPMs?
Wiki User
∙ 18y ago
If the engine knocks when it is cold, it might be a crack in the exhaust manifold, or possibly a crack in on of the exhaust manifold bolts leading to the block. The crack is small, and once warm will swell shut, thereby stopping the noise. Without repair, it might lead to valve exhaust valve damage.
Wiki User
∙ 18y ago
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