GM 12596576
Throttle Body

To replace the Throttle Body assembly, you pull out the air cleaner assembly, the accelerate control cable and the cruise control cable from Throttle Body, and the vacuum hose. Next, disjoin throttle position (TP) sensor and idle air control (IAC) valve harness connectors along with the coolant hoses from the Throttle Body and a vapor vent pipe. Unscrew the Throttle Body attaching nuts, and then remove the Throttle Body with the gasket and dispose of the old gasket. Clean the gasket sealing surfaces without ruining the aluminum surfaces. Do not hot soak the Throttle Body in a cold immersion type cleaner because the throttle plate has a factory applied sealing compound which may be wrecked by strong solvents or brushing; however, use a spray type cleaner like gm x-66a or gm p/n 1052626 and a shop towel for heavy deposits. Make sure the tp sensor and iac valve do not touch on any solvent or cleaner. The assembly part would require the placement of the Throttle Body with a brand-new gasket with the attachment nuts done by tightening them to 10 n.m (89 lb in). Reconnect the coolant hoses, accelerator control cable /cruise control cable / tp sensor, iac valve electrical connectors and vacuum hose, reinstallation of the air cleaner assembly. With the engine turned off, ensure free movement of the accelerator pedal and then press and release it. Turning the ignition on for 10 sec, off for 5 sec, and then running the engine to inspect that it is this idles at the correct speed is how to reset the iac valve.

In order to replace the Throttle Body assembly, one should remove air cleaner assembly, then disconnect accelerator control cable and cruise control cable from the Throttle Body and then disconnect vacuum hose. Next to detach the throttle position (TP) sensor and idle air control (IAC) valve harness connectors, as well as the coolant hoses from Throttle Body and vapor vent pipe. Roj the Throttle Body attaching nuts and thereafter remove the Throttle Body along with the gasket which you should throw away while taking care that the surfaces of sealing are not harmed during the cleaning process. Do not submerge the Throttle Body into cold type immersion cleaners since there is a factory-applied sealing compound to the throttle plate which will be damaged in harsh solvents. Clean the Throttle Body with a spray type cleaner such gm x-66a, or gm p/n 1052626 and make sure that the tp sensor and iac valve have no direct contact with solvents. After cleaning the surfaces of the gasket sealing, instal the Throttle Body that has a new gasket and attach the body to the attaching nuts, tightening the latter to 10 n.m (89 lb in). Connect the coolant hoses, accelerator control cable, cruise control cable, tp sensor, iac valve electrical connectors and the vacuum hose. Finally, reinstall the air cleaner assembly, check the accelerator pedal for free movement when using the engine off and also reposition the iac valve by master ignition for 10 seconds and then 5seconds before starting the engine to confirm that it idles well.

Disconnect the idle air control (IAC) valve harness connector and throttle position (TP) sensor harness connector.

Use a spray type cleaner such as GM X-66A or GM P/N 1052626 and a shop towel for heavy deposits.