GM 12595275
Throttle Body

As a first step in Throttle Body assembly replacement start by draining coolant from the system. Begin the Throttle Body assembly replacement process by disconnecting these four components: the intake air temperature (IAT) sensor electrical connector, the breather tube from the air intake tube, idle air control (IAC) valve electrical connector, and the throttle position (TP) sensor electrical connector. Cables for accelerator control and Throttle Body bypass hoses along with its heater pipe nut must be removed. After undoing the securing hardware between the Throttle Body and Intake Manifold pull out the complete Throttle Body assembly. Never apply solvents when cleaning the Throttle Body assembly and Intake Manifold gasket surfaces because this will damage the gasket materials. Installation of a fresh gasket is necessary before putting in the Throttle Body assembly. Lock everything down with retaining nuts and bolts before applying a torque of 28 n.m (21 lb ft). After following the previous instructions, reattach the Throttle Body coolant bypass hoses, the heater pipe nut and the iac valve electrical connector in addition to the tp sensor electrical connector. The installation process includes reattaching the accelerator control cable bracket alongside the air intake tube and securing the clamp fittings. Inspection of throttle position occurs through accelerator pedal operation to verify complete movement between closed and wide open throttle (WOT) positions while you complete the installation by attaching the iat sensor electrical connector and breather tube to the air intake tube and adding coolant before checking throttle movement.

Drain the coolant first to replace the Throttle Body assembly. Then, unscrew the air intake duct and disconnect the idle air control (IAC) valve electrical connector as well as the throttle position (TP) sensor electrical connector. Take off the accelerator control cable bracket, disengage the Throttle Body coolant bypass hoses, and heater pipe nut at the throttle assembly. Remove nuts and bolts to detach the Throttle Body from the Intake Manifold and remove the Throttle Body assembly ensuring that you dispose off the old gasket. During the installation, it is important to clean the gasket surfaces on the Intake Manifold and the throttle no body while not using any solvent to avoid destroying them. In case needed, install a new gasket and then place Throttle Body assembly. Install the Throttle Body retaining nuts and bolts, tightening them to 28 n.m (21 lb ft). Install the Throttle Body retaining nuts and bolts, tightening them to 28 n.m (21 lb ft). Connect the Throttle Body coolant bypass hoses and the heater pipe nut, iac valve, and tp sensor electrical connectors. Afterwards, reinstall the accelerator control cable bracket and the air intake duct, then top the coolant. Make sure throttle opens and closes freely without binding between closed position and full wide open position and inspect for full throttle opening and full throttle closing when you squeeze the accelerator pedal and also inspect for poor carpet fit under the accelerator pedal.

Remove the air cleaner outlet duct and the air inlet screen if applicable.

Disconnect the intake air temperature (IAT) sensor electrical connector, the idle air control (IAC) valve electrical connector, and the throttle position (TP) sensor electrical connector.

Disassemble the throttle body for thorough cleaning with a parts cleaning brush, ensuring not to immerse it in any cleaning solvent.

First, remove the air cleaner outlet duct and the air inlet screen if applicable.

Disconnect the accelerator controls cable, and if applicable, disconnect the cruise control cable from the throttle lever and cable bracket, then remove the accelerator control cable bracket.

Ensure the throttle operates freely without binding between fully closed and wide open positions, and inspect for complete throttle opening and closing by operating the accelerator pedal, also checking for poor carpet fit under the accelerator pedal.

Clean the gasket surfaces on the intake manifold and the throttle body assembly carefully, avoiding any solvents or sharp tools that could cause damage.

Reconnect the throttle body coolant bypass hoses and the heater pipe nut, followed by the IAC valve and TP sensor electrical connectors.

Remove the air intake duct and disconnect the idle air control (IAC) valve electrical connector, followed by the throttle position (TP) sensor electrical connector.