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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 228 (ENGINE CONTROLS - REMOVAL & INSTALLATION)AIR INDUCTION SYSTEMSTHROTTLE BODYCLEANING
1999 GMC Forward Control 5.7 R, Automatic

Throttle Body: Cleaning

1999 GMC Forward Control 5.7 R, AutomaticSECTION Cleaning
WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. 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:
  • TP sensor.
  • 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.
  1. Inspect the throttle body bore and the throttle valve plate for deposits. Open the throttle valve in order 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 (P/N 1052626) or an equivalent product.
  2. If the deposits are excessive, disassemble the throttle body for cleaning. After disassembly, clean the throttle body using a parts cleaning brush. DO NOT immerse the throttle body in any cleaning solvent. When cleaning is completed, install the TP sensor and IAC valve.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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