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 162 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTS - 2.2L)EMISSION SYSTEMS & SUB-SYSTEMSEVAPORATIVE EMISSION SYSTEM CLEANINGCLEANING PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic
Cleaning Procedure
1999 GMC Forward Control 5.7 R, AutomaticSECTION Cleaning Procedure
WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
- Raise and support the vehicle.
- Remove the EVAP canister.
- Turn OFF the main valve on the EVAP Pressure and Purge Station.
- Disconnect the hose from the diagnostic station pressure regulator.
- Using a section of vacuum hose, connect one end onto the diagnostic station pressure regulator.
- Connect the other end of the vacuum hose to the canister side of the purge pipe.
- Turn ON the main nitrogen cylinder valve and continue to discharge nitrogen for 15 seconds.
- If the nitrogen does not dislodge the carbon particles, replace the purge pipe.
- Return the EVAP pressure/purge diagnostic station to the original condition of the station.
- Install a new EVAP canister.
- Lower the vehicle.
- Install a new EVAP canister purge valve.
- Return to the published 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.