It takes a special tool to remove the decoupler, here is r and r information
08 - Electrical/8F - Engine Systems/Charging/DECOUPLER, Generator/Removal
8433A - Remover/Installer, Decoupler
Originally Shipped In Kit Number(s) 8433, 9090CC.
1.Release hood latch and open hood.2.Disconnect battery negative cable.3.Raise vehicle and support.4.Remove the right front lower splash shield.
5.Remove accessory drive belt, refer to the Cooling System section for proper procedures Figure 1
Figure 1 - DRIVE BELT 3.3/3.8L
6.Lower vehicle.7.Remove the Air Box, refer to the Engine section for more information.8.Remove the decoupler pulley cover.
9.Use Special Tool 8433A Figure 3
to loosen the Generator Decoupler Figure 2
Figure 2 - DECOUPLER REMOVAL (LITENS)
10.Remove the tool.11.Remove the Generator Decoupler.
Figure 3 - SPECIAL TOOL 8433 AND DECOUPLER