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The Scion Variable Timing Sprocket also adjusts the timing of the cam timing in a way that the engine runs more readily at every rpm, providing young drivers with more pull and better mileage. In 2003, Scion was launched with the daring colors, plain prices and interactive advertising such as the Virtual Scion City that invited first time buyers to the showroom. The fact that Scion was able to consider every car a blank canvas made the owners customize their cars and the limited Release Series kept the buzz high. Scion was a rolling test lab which brought new technology to the market swiftly and sold over a million vehicles before the brand closed its doors in 2016, but its spirit continues to influence Toyota today. A Variable Timing Sprocket is a intelligent cam gear that changes the timing at which the valves open and close, with respect to the crankshaft, to increase power, fuel economy, and emissions performance throughout the rev range. In order to fit a Variable Timing Sprocket to a Scion engine, disconnect the battery, and remove any covers and adjust the crank until the timing marks align at top dead center. Turn the camshafts, loosen the chain or belt and unbolt the old Variable Timing Sprocket, keeping the marks in sight. Install the new sprocket using the index lines to align the new sprocket to the factory marks, put threadlocker on the bolts, and tighten them to specification, re-tension the drive, rotation the crank by hand two full rotations to check alignment, re-assemble the covers, reconnect the battery, clear stored faults, and start the engine to ensure smooth operation.