GMC 12596575 Throttle Body Assembly

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To remove the throttle body, relieve fuel system pressure and disconnect the negative battery terminal. Remove engine cover and disconnect electrical connector from throttle body. Disconnect fuel supply and return lines, remove bracket bolt, and loosen nuts attaching fuel lines to throttle body. Remove throttle body, accelerator cable bracket, ignition coil/module assembly, and EVAP canister purge solenoid. Carefully remove upper intake manifold and detach poppet nozzles from intake manifold. Pry bracket locking tabs away from throttle body and remove assembly. Remove fuel injector hold-down plate nuts and plate, then push injector out of throttle body. For installation, replace injector O-rings and apply light coat of clean engine oil before pressing injector into throttle body. Install injector hold-down plate and nuts, then install throttle body onto intake manifold bracket. Install poppet nozzles and ensure they are properly seated. Inspect and replace seals if necessary, then install upper intake manifold, EVAP purge valve, and ignition coil/module assembly. Inspect and replace damaged fuel line O-rings and retainers, then install fuel lines and bracket. Install throttle body with new gasket. Remaining steps are reverse of removal. Finally, activate fuel pump by turning ignition switch to ON and check for fuel leakage in fuel lines and throttle body.

The first step is to disconnect the cable from the negative terminal of the battery.