The Ford F-250 has known issues with the V8 engine ejecting spark plugs. This will make a tapping or knocking noise, plus the engine will begin to misfire at all speeds. The check engine light will also illuminate. The threads on the cylinder head are too short and soft, allowing pressure from combustion to overwhelm and destroy the threads. When the spark plug ejects, the cylinder head becomes damaged, necessitating repair of the spark plug port threads, or replacement of the cylinder head and cylinder head gasket. Ford has recommended a method of repair for the cylinder head that prevents the spark plug from ejecting under future use. Replacement of all spark plugs is not necessary, but an updated spark plug design can help prevent this from happening in the future. There is a technical service bulletin for the V8 engine.

Some Nissan Pathfinder owners report experiencing stalling issues after 15 minutes of driving, which can often be resolved by replacing the crankshaft sensor. However, if a knocking sound continues even after this replacement, owners may encounter additional problems such as low oil levels, ignition issues, timing problems, worn rod bearings, or faulty knock sensors. A malfunctioning knock sensor may lead to engine knocking and could trigger a trouble code like P0325. Furthermore, worn rod bearings, situated between the crankshaft and piston rods, are known to produce knocking sounds. If the check engine light remains illuminated after the crankshaft sensor replacement, it might indicate improper installation or unrelated issues with the fuel or ignition systems. While a faulty crankshaft sensor can indirectly contribute to engine knock by sending inaccurate data to the engine control module, it is not typically a direct cause of knocking sounds. Therefore, if the knocking persists, further investigation into these potential causes is advisable.