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.
1998 GMC EnvoyFACTORY OEM SERVICE PROCEDURE
Component Locations
NOTE:
Component location illustrations are not available at time of publication.
COMPONENT LOCATIONS (VIN W & X)
| Component | Location | |
|---|---|---|
| A/C Compressor High Pressure Cut-Off Switch | On Rear Of A/C Compressor | |
| A/C Compressor Relay | In Power Distribution Box, Left Front Of Engine Compartment | |
| A/C Cycling Switch | On Accumulator | |
| A/C High Pressure Cut-Off Switch | On Rear Of A/C Compressor | |
| Camshaft Position (CMP) Sensor | In Distributor | |
| Crankshaft Position (CKP) Sensor | Below Right Front Of Engine, Near Harmonic Balancer | |
| Cruise Control Module | Left Rear Of Engine Compartment, On Cowl | |
| Data Link Connector (DLC) | Lower Left Side Of Instrument Panel | |
| Distributor | Top Rear Of Engine | |
| EGR Valve | Top Rear Of Engine, Near Drive Belt | |
| Electronic Ignition Control Module | Top Right Side Of Engine | |
| Engine Coolant Temperature (ECT) Sensor | Top Front Of Engine, Between A/C Compressor & EGR Valve, On Thermostat Housing | |
| EVAP Canister | Left Rear Of Vehicle, Near Fuel Tank | |
| EVAP Canister Purge Solenoid | Top Right Center Of Engine | |
| EVAP Canister Vent Valve | On Crossmember At Fuel Tank | |
| Fuel Injector | Top Center Of Engine | |
| Fuel Level Sensor | Top Of Fuel Tank | |
| Fuel Pump Prime Connector | Left Rear Side Of Engine Compartment | |
| Fuel Pump Relay | In Power Distribution Box In Left Front Of Engine Compartment | |
| Fuel Tank Pressure Sensor | Top Of Fuel Tank | |
| Idle Air Control (IAC) Valve | Top Left Side Of Engine | |
| Ignition Coil | Top Right Side Of Engine | |
| Intake Air Temperature (IAT) Sensor | Left Front Of Engine Compartment, On Air Intake Duct | |
| Knock Sensor | Top Rear Of Engine, Above Transmission Bellhousing | |
| Manifold Absolute Pressure (MAP) Sensor | Top Center Of Engine, On Intake Manifold | |
| Mass Airflow (MAF) Sensor | Left Front Of Engine Compartment, In Air Intake Duct | |
| Oxygen Sensor (O2S) | ||
| Bank 1, Sensor No. 1 | On Rear Of Left Exhaust Pipe, To Left Side Of Transmission | |
| Bank 2, Sensor No. 1 | Right Rear Of Engine, In Exhaust Pipe | |
| Bank 1, Sensor No. 3 | Rear Of Catalytic Converter | |
| Relay Center | Behind Instrument Panel Glove Box | |
| Throttle Position (TP) Sensor | Top Left Side Of Engine | |
| Vehicle Control Module (VCM) | Right Side Of Engine Compartment | |
| Vehicle Speed Sensor | ||
| A/T With 2WD | Right Rear Of Transmission | |
| A/T With 4WD | Left Rear Of Transfer Case | |
| M/T With 2WD | Left Rear Of Transmission | |
| M/T With 4WD | Left Rear Of Transfer Case | |
Factory Service Tools
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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.
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