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 231 (ENGINE CONTROLS - REMOVAL & INSTALLATION)AIR INDUCTION SYSTEMSTHROTTLE BODYINSTALLATION
1999 GMC Forward Control 5.7 R, Automatic
Throttle Body: Installation
1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Clean the gasket surface on the intake manifold and the throttle body assembly. Install a new gasket, if necessary. Install the throttle body assembly. Install the throttle body retaining nuts and bolts. Tighten the throttle body retaining nuts and bolts to specification. See TORQUE SPECIFICATIONS .
- Connect the throttle body coolant by-pass hoses. Connect the heater pipe nut at the throttle body. Connect the IAC valve electrical connector. Connect the TP sensor electrical connector.
- Install the accelerator controls cable bracket. Connect the accelerator cable cross slug to the throttle body lever. Connect the cruise control cable to the throttle body lever. Install the air intake tube and tighten the clamps. Connect the IAT sensor electrical connector.
- Connect the breather tube to the air intake tube. Refill the cooling system. See COOLING SYSTEM BLEEDING under COOLING SYSTEM.
- The throttle should operate freely without binding between full closed and wide open throttle. Inspect for complete throttle opening and closing positions by operating the accelerator pedal. Also inspect for poor carpet fit under the accelerator pedal.
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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.