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 234 (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 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
- Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE . Remove the Mass Airflow/Intake Air Temperature (MAF/IAT) sensor electrical connector. Remove the air cleaner intake duct assembly.
- Remove the Positive Crankcase Ventilation (PCV) valve fresh air tube. See Figure. Remove the cruise control cable from accelerator controls cable bracket. Remove the accelerator cable from accelerator controls cable bracket. Remove the cruise control cable from throttle body lever.
- Remove the accelerator control cable from throttle body lever. Remove the Idle Air Control (IAC) valve electrical connector. See Figure. Remove the Throttle Position (TP) sensor electrical connector. Remove the fuel feed and return lines from the retainer on the accelerator controls cable bracket.
- Remove the transaxle shift cable clip from the accelerator controls cable bracket. Remove the throttle body bolts from the water crossover assembly. See Figure. Remove the accelerator controls cable bracket from the throttle body, if necessary.
RENDER: 1.0x
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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.