Throttle Body Cleaning Procedure
WARNING: This page is about a different car, the 2003 Pontiac Grand Am and 2003 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
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 or 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 (MEK). This extremely strong solvent may damage components and is not necessary for this type of cleaning.
- Inspect the throttle body bore and the throttle valve plate for deposits. Open the throttle valve to inspect all of the surfaces.
- Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner (1052626), or equivalent. If the deposits are excessive, disassemble the throttle body for cleaning.
- If the deposits are excessive, remove and disassemble the throttle body for cleaning. Refer to the following procedures:
- Throttle Body Assembly Replacement. See THROTTLE BODY , if not already removed.
- Throttle Position (TP) Sensor Replacement. See THROTTLE POSITION SENSOR under SENSORS.
- Idle Air Control (IAC) Valve Replacement. See IDLE AIR CONTROL VALVE under MOTORS & SOLENOIDS.
- After disassembly, clean the throttle body using a parts cleaning brush. Do NOT immerse the throttle body in any cleaning solvent.
- If you removed and disassembled the throttle body for cleaning, assemble and install the throttle body.
- Install air cleaner outlet resonator, air cleaner intake duct and vent hose.