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.
2004 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE
Throttle Body Cleaning Procedure
- Remove the air cleaner intake duct. Refer to Air Cleaner Intake Duct Replacement .
- Remove the snap ring (3).
- Remove the air inlet screen (2).
- Inspect the throttle body bore and the throttle valve plate for deposits. You must open the throttle valve in order to inspect all of the surfaces.
- Throttle position (TP) sensor
- Idle air control (IAC) valve
- Sealed throttle shaft bearings
- Clean the throttle body bore and the throttle valve plate using a clean shop towel with GM Top Engine Cleaner, P/N 1052626 (Canadian P/N 993026) or an equivalent product.
- If the deposits are excessive, remove and disassemble the throttle body for cleaning. Refer toThrottle Body Assembly Replacement (L36) or Throttle Body Assembly Replacement (L67) .
- 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. Refer to Throttle Body Assembly Replacement (L36) or Throttle Body Assembly Replacement (L67) .
- Install the air inlet screen (2).
- Install the snap ring (3).
- Install the air cleaner intake duct. Refer to Air Cleaner Intake Duct Replacement .
NOTE:
Do not subject a throttle body assembly which contains the following components to an immersion cleaner or a strong solvent:
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.
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.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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