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 249 (ENGINE CONTROLS - REMOVAL & INSTALLATION)AIR INDUCTION SYSTEMSTHROTTLE BODYREMOVAL (VIN 1)
1999 GMC Forward Control 5.7 R, Automatic
Removal (VIN 1)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal (VIN 1)
WARNING: This page is about a different car, the 2003 Pontiac Bonneville, 2003 Buick Park Avenue, and 2003 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
- Turn OFF the ignition. Remove fuel injector sight shield (upper engine cover) from engine. Drain the cooling system. Disconnect the Intake Air Temperature (IAT) sensor electrical connector. Remove the air cleaner intake duct from the throttle body. Disconnect the Idle Air Control (IAC) valve electrical connector. See Figure.
- Disconnect the Throttle Position (TP) sensor electrical connector. Disconnect the Mass Airflow (MAF) sensor electrical connector. Remove the cruise control cable from the accelerator control bracket and throttle body lever. Remove the accelerator control cable from the accelerator control bracket and throttle body lever. Remove the electrical harness retainer clip from the accelerator control cable bracket, if applicable. Note locations and remove the vacuum hoses from the throttle body.
- Remove the 3 nuts and bolts holding the throttle body to the supercharger. Remove the throttle body assembly from the intake manifold. Clean the gasket surface on the intake manifold and the throttle body assembly.
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.