GM 24507227
Throttle Body

Cleaning requires removing the air cleaner intake duct followed by pulling out the snap ring and air inlet screen. A thorough inspection of the Throttle Body bore requires the throttle valve to be opened so technicians can check both the Throttle Body bore and the throttle valve plate for deposits. Use the gm top engine cleaner, p/n 1052626 (Canadian P/N 993026) or equivalent solution to remove deposits from the Throttle Body bore and throttle valve plate while cleaning with a new shop towel. Strong solvents used with immersion cleaners should be avoided when cleaning assemblies which have throttle position (TP) sensors idle air control (IAC) valves and sealed throttle shaft bearings because these compounds can harm electrical components and degrade seals as well as o-rings while also degrading the throttle shaft bearing grease. Using wire brushes or scrapers is dangerous to the Throttle Body components while avoiding methyl ethyl ketone based cleaners. Throttle Body disassembly is needed for cleaning when deposits become too extensive although users should employ a parts cleaning brush that avoids solvent submersion. Install the Throttle Body after cleanup then put the air inlet screen into place followed by the snap ring before securing the air cleaner intake duct.

Begin with partial draining of the cooling system in order to replace the Throttle Body assembly. Leave the fuel injector sight shield and intake air cleaner duct. Remove the idle air control (IAC), throttle position (TP), and mass air flow (MAF) sensor electrical connectors. Next, take off the accelerator controls cable bracket and take apart the electrical wiring harness from the accelerator controls cable bracket. Pull off the vacuum hoses from the Throttle Body, then remove Throttle Body support bracket bolts and the support bracket. Remove the throttle-body nuts and lift off the Throttle Body assembly. Clean out the surfaces of the gasket effectively without the use of solvents or sharp tools that will cause damage. For installation, set a new gasket and then tighten the Throttle Body assembly using Throttle Body nuts of 10 n.m (89 lb in). Reattach the Throttle Body support bracket and bolt it up to 16 n.m (12 lb ft). Reconnect vacuum hoses, accelerator control cable bracket, and electrical wiring harness back to the accelerator controls bracket. Connect the maf sensor, tp sensor, and nice valve electrical connectors, reinstall the air cleaner intake duct + the fuel injector sight shield. Finally, fill the cooling system.

Detach the throttle body inlet hose clamp and the hose from the coolant pipe.

Reinstall the throttle body assembly, tightening the nuts and bolts to 28 N.m (21 lb ft).

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

Reattach the exhaust crossover, connect the vacuum line to the throttle body, and reinstall the accelerator controls cable bracket.

Refill the engine coolant and ensure the throttle operates correctly, checking for free movement without binding and inspecting for complete throttle opening and closing.

Reattach the inlet and outlet hoses, and install the heater pipe nut, tightening it to 25 N.m (18 lb ft).

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 electric components, seals, or O-rings.

If deposits are excessive, disassemble the throttle body for thorough cleaning, then reassemble and install it before reinstalling the air cleaner intake duct.

These can damage electric components, seals, or O-rings, and may wash away grease on non-serviceable bearings. Do not use a wire brush or scraper, as these can harm the throttle body components, and avoid cleaners with methyl ethyl ketone due to their potential for damage.

Clean with a clean shop towel and GM Top Engine Cleaner, P/N 1052626 (Canadian P/N 993026) or a similar product.

Remove the throttle body support bracket bolts and the support bracket itself.

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

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