| BDE has some great info on VTCs: http://bde-performance.com/vtc.htm "The noise is typical with high-mileage pulleys and/or aftermarket higher-pressure valve springs that cause the cams to over-rotate on every cylinder's intake valve-closing event." "True VTC noise can be verified by activating the VTC solenoids using a ConZult or by grounding their green with black stripe wires while the engine is idling."
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