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 266 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)COMPONENT LOCATIONS
1999 GMC Forward Control 5.7 R, Automatic
Component Locations
1999 GMC Forward Control 5.7 R, AutomaticSECTION Component Locations
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For component locations, see COMPONENT LOCATIONS
table. See Fig 1
-Fig 8
.
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| Camshaft Position Sensor | On Front Of Right Cylinder Head |
| Crankshaft Position Sensor "A" & "B" | Lower Left Side Of Engine Near Oil Filter |
| Engine Coolant Temperature Sensor | Left Rear Of Engine, Below EGR Valve Mount |
| Engine Oil Level Switch | Front Of Oil Pan |
| Engine Oil Pressure Sensor | Right Front Side Of Engine, Near Oil Filter Housing |
| EVAP Canister Purge Solenoid | On Top Of Engine, At Rear Of Throttle Body |
| EVAP Canister Vent Solenoid | Right Rear Of Vehicle |
| Exhaust Gas Recirculation Valve | On Top Of Engine, Rear Of Intake Manifold |
| Fuel Sender | Top Of Fuel Tank |
| Fuel Tank Pressure Sensor | Under Fuel Sensor Access Panel |
| Idle Air Control Valve | On Top Of Engine, At Front Of Throttle Body |
| Ignition Control Module (Right & Left) | Top Of Right & Left Cam Covers |
| Intake Air Temperature Sensor | Part Of Mass Airflow Sensor |
| Knock Sensor | On Engine, Beneath Intake Manifold |
| Manifold Absolute Pressure Sensor | Top Rear Of Engine, At Rear of Intake Manifold |
| Mass Airflow Sensor | On Left Side Of Engine Compartment, Attached To Throttle Body Intake Air Duct |
| Post-Converter Oxygen Sensor | On Exhaust Pipe Behind Catalytic Converter |
| Powertrain Control Module | Left Side Of Engine Compartment, Under Air Cleaner |
| Pre-Converter Oxygen Sensors | In Front & Rear Exhaust Manifolds |
| Secondary Air Injection Solenoid Valve | On Top Right Side Of Engine, Under Sight Shield |
| Throttle Position Sensor | On Top Right Side Of Engine, Near Throttle Body |
| Vehicle Speed Sensor | Top Right Side Of Transaxle Output Housing |
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.