OEM 2008 GMC Yukon Throttle Body

2008 GMC Yukon Throttle Body Parts and Q&A

• Q: How to replace the throttle body assembly on 2008 GMC Yukon?

  A: The first step when replacing the Throttle Body assembly demands delicate handling of electronic throttle control components while avoiding cleaning solvents and keeping tools away from the throttle plate to avoid wedge damage. Start by disconnecting the electronic throttle control from its engine wiring harness electrical connector followed by removing the air cleaner outlet duct. Start the disassembly by removing Throttle Body nuts 507 then bolts 538 before extracting Throttle Body 508 and replacing Throttle Body Gasket 509. A new Throttle Body Gasket needs to be placed onto the Intake Manifold where its tab should match up with the notch. Fasten the Throttle Body (508) to its mounting position while securing its bolts (538) and nuts (507) to a torque of 10 n.m (89 lb in). Check the engine wiring harness electrical connector seal of the electronic throttle control before connecting the harness to the control and reinstalling the air cleaner outlet duct. A scan tool should be used to verify proper throttle-operation between closed throttle and wide open throttle (WOT). Confirm that the accelerator pedal works without restriction during this range. Start the engine along with inspecting for coolant leaks only after stepping through these operational requirements: verify the vehicle is not in reduced engine power mode, maintain ignition in on position, and ensure engine stays off.