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The camshaft controls the opening and closing of the engine's intake and exhaust valves, synchronizing with the crankshaft to ensure proper timing for fuel combustion.

Indicators include misfiring, reduced engine power, unusual noises from the valve train, and a check engine light.

Camshafts are durable but should be inspected during major engine services or if performance issues arise. Replacement is necessary if significant wear or damage is detected.

Yes, performance camshafts can enhance engine power and efficiency by altering valve timing and lift, but they should be chosen based on specific engine requirements.