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 151 (ENGINE CONTROL SYSTEM & ENGINE COMPONENT TESTS - 2.2L)EMISSION SYSTEMS & SUB-SYSTEMSEVAPORATIVE EMISSION SYSTEM CLEANINGCLEANING PROCEDURES
1999 GMC Forward Control 5.7 R, Automatic
Cleaning Procedures
1999 GMC Forward Control 5.7 R, AutomaticSECTION Cleaning Procedures
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Raise and support vehicle. Remove EVAP canister.
- Turn off main valve on EVAP Pressure/Purge Diagnostic Station (J-41413).
- Disconnect hose from diagnostic station pressure regulator.
- Using a section of vacuum hose, connect one end onto diagnostic station pressure regulator.
- Connect other end of vacuum hose to canister side of purge pipe.
- Turn on main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
- If nitrogen does not dislodge carbon particles, replace purge pipe.
- Return EVAP pressure/purge diagnostic station to original condition of station.
- Install a new EVAP canister.
- Connect all previously disconnected EVAP pipe connectors.
- Lower vehicle.
- Return to appropriate DTC service procedure.
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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.