GM 12595271
Throttle Body

A replacement of the Throttle Body assembly requires draining the cooling system first. Remove the air cleaner intake duct while disconnecting two components: the idle air control (IAC) valve electrical connector and the throttle position (TP) sensor electrical connector. Begin by disassembling the Throttle Body assembly through removal of the accelerator controls cable bracket followed by the Throttle Body inlet and outlet hoses. Start by removing the heater pipe nut at the Throttle Body before using a wrench to remove the assembly with Throttle Body Gasket and securing bolts and nuts. The gasket mating surfaces require inspection after cleaning with caution to avoid any solvent use and strict avoidance of sharp tools that could harm the surfaces. Installation requires new gasket replacement followed by Throttle Body assembly mounting through nut and bolt tightening to 28 n.m (21 lb ft). Next install the inlet and outlet hoses before screwing in and tightening the heater pipe nut to 25 n.m (18 lb ft). The next steps include attachment of tp sensor and iac valve electrical connectors followed by bracket install for the accelerator controls and air cleaner intake duct. Fill the cooling system afterward.

In cleaning the Throttle Body, first will be to remove the air cleaner intake duct then, the next thing is to pull out the snap ring and the air inlet screen. Examine the bore of the Throttle Body and the throttle valve plate for deposits and throttle valve should be opened for full visibility. When working with assemblies that include the throttle position (TP) sensor, idle air control (IAC) valve, or sealed throttle shaft bearings, do not immerse clean the parts in a strong solvent, since this will damage electrical parts, seals, or o-rings and solvents may cause damage to grease on non-serviceable bearings. Avoid using wire brushes or scrapers as they can pose a threat to the Throttle Body. Do not clean using cleaners with the presence of methyl ethyl ketone, that can damage components. Clean the Throttle Body bore and valve plate using a clean shop towel and gm top engine cleaner, various part numbers:germany, p/n 1052626 / canada, p/n 993026 or equivalent. In case there are excessive deposits, dismantle the Throttle Body and clean it properly with parts cleaning brush not immersing it in any solvent. Reassemble and fix the Throttle Body again, followed by the air inlet screen, snap ring and air cleaner intake duct.

Connect the throttle body coolant bypass hoses, heater pipe nut, IAC valve electrical connector, TP sensor electrical connector, and the accelerator controls cable bracket.

Cleaners containing methyl ethyl ketone should not be used, as they can damage components unnecessarily.

If deposits are excessive, disassemble the throttle body for cleaning, using a parts cleaning brush without immersing it in any solvent.

Take out the nuts and bolts securing the throttle body assembly and remove the assembly itself along with the throttle body gasket.

Proceed to remove the exhaust crossover, followed by the throttle body support bracket bolts and the support bracket itself.

Install the accelerator controls cable bracket, reconnect the cruise control cable if applicable, and then connect the accelerator controls cable.

Detach the vacuum hoses from the throttle body.

Inspect the throttle body bore and the throttle valve plate for deposits, ensuring the throttle valve is opened to check all surfaces.

Avoid using immersion cleaners or strong solvents on assemblies containing the throttle position (TP) sensor, idle air control (IAC) valve, or sealed throttle shaft bearings, as these can damage components with seals or O-rings and may wash away grease on non-serviceable throttle shaft bearings.

Install the air intake tube, reconnect the IAT sensor electrical connector, and connect the breather tube to the air intake tube.