Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Throttle Body Cleaning
- Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement (LT1) and Air Cleaner Outlet Duct Replacement (LT4) .WARNING: Refer to Safety Glasses Warning .
- Fully open the throttle valve in order to Inspect the throttle body bore and the throttle valve plate for any deposits.
- Use a clean shop towel and an approved GM engine cleaner. Clean the throttle body bore and the throttle valve plate.CAUTION:
Do not subject a throttle body assembly which contains the following components to an immersion cleaner or a strong solvent:
- Throttle position (TP) sensor
- Idle air control (IAC) valve
- Sealed throttle shaft bearings
The cleaners will damage the electric components or sensors.
The cleaners will damage some of these components that contain seals or O-rings.
Solvents can wash away or break down the grease used on non-serviceable throttle shaft bearings.
Never use a wire brush or scraper to clean the throttle body. A wire brush or sharp tools may damage the throttle body components.
Do not use a cleaner that contains methyl ethyl ketone. This extremely strong solvent may damage components and is not necessary for this type of cleaning.
If necessary, use a parts cleaning brush in order to remove heavy deposits.
- Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement (LT1) and Air Cleaner Outlet Duct Replacement (LT4) .
- Perform the throttle idle learn procedure. Refer to Q38 Throttle Body: Throttle/Idle Learn .
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.