- Remove the air cleaner outlet duct. Refer to
Air Cleaner Outlet Resonator Replacement
.
- Inspect the throttle body bore and throttle plate for deposits. You must
open the throttle plate in order to inspect all of the surfaces.
Notice: 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.
- Clean the throttle body bore and the throttle plate using a clean
shop towel and top engine cleaner, GM P/N 1052626 (Canadian P/N 993026),
or equivalent.
- If the deposits are excessive, remove and disassemble the throttle body
for cleaning. Refer to the following procedures:
- After disassembly, clean the throttle body using a parts cleaning brush.
DO NOT immerse the throttle body in any cleaning solvent.
- If removed and disassembled for throttle body cleaning, assemble and install
the throttle body. Refer to the following procedures:
- Install the air cleaner outlet duct. Refer to
Air Cleaner Outlet Resonator Replacement
.