Part Type: Accessory Drive Belt Idler Pulley. Idler / Tensioner Pulley. Pulley Type: Idler Pulley. Belt Type: Back Idler. Style: Idler / Tensioner Pulley. 1990 Chrysler New Yorker Back Idler;. 1991 Chrysler New Yorker Submodel: Base; Engine: 2.5L L4; Back Idler;.