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.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 228 (ENGINE CONTROLS - REMOVAL & INSTALLATION)AIR INDUCTION SYSTEMSTHROTTLE BODYREMOVAL
1999 GMC Forward Control 5.7 R, Automatic
Throttle Body: Removal
1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal
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.
- Turn ignition off. Remove engine cover. See ENGINE COVER under MISCELLANEOUS. Disconnect negative battery cable. Remove air cleaner outlet duct from throttle body. Remove air cleaner outlet duct adapter stud.
- Disconnect accelerator control cable from throttle shaft. See Figure . Disconnect cruise control cable from throttle shaft (if equipped). See Figure . Remove transmission fluid filler tube-to-accelerator control cable bracket retaining bolt. Remove accelerator control cable bracket and position aside.
- Disconnect IAC valve and TP sensor harness connectors from throttle body. See Figure . Remove throttle body retaining studs. Remove throttle body assembly from intake manifold. See Figure . Remove flange gasket and discard.
RENDER: 1.0x
NO RELATED
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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.