A knocking sound in a 1994 Ford Ranger could be caused by several issues, such as low engine oil, worn bearings, or a malfunctioning spark plug. It's essential to check the oil level and quality first, as insufficient lubrication can lead to serious engine damage. If the oil is fine, the knocking might indicate problems with the engine internals, such as a failing rod or main bearing. It's advisable to have a mechanic diagnose the issue to prevent further damage.
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