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In the 2013 Lexus RX350, there is a timing chain in the engine. This chain helps coordinate the movement of the crankshaft and camshaft, ensuring they work together correctly to open and close the valves for each cylinder's firing. It's crucial for the chain to be lubricated by the engine oil for proper functioning. If the timing chain becomes worn out and loose, it can lead to the valves running out of sync, causing the engine to perform poorly and result in a rough idle for the vehicle.
The 2013 model of the Lexus RX 350 features a timing chain instead of a timing belt.