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 98 (ENGINE CONTROL SYSTEM TESTING & ENGINE COMPONENT TESTING)EMISSION SYSTEMS & SUBSYSTEMSEVAPORATIVE EMISSION SYSTEM CLEANINGINSPECTION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic
Inspection Procedure
1999 GMC Forward Control 5.7 R, AutomaticSECTION Inspection Procedure
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn SL2, 2002 Saturn SL1, 2002 Saturn SL, 2002 Saturn SC2, and 2002 Saturn SC1. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the EVAP Pressure/Purge Diagnostic Station (J 41413) in order to provide a clean, dry, low pressure gas source. Do not substitute any other pressurized gas source. Damage may result to the EVAP system.
- Turn OFF the ignition.
- Remove the EVAP canister purge valve.
- Lightly tap the EVAP canister purge valve on a hard surface.
- Inspect for carbon particles exiting either of the vacuum ports.
- If no carbon particles were detected, but a blockage was detected during a diagnostic procedure. Install the original EVAP canister purge valve and continue with the cleaning procedure.
- If carbon particles are found during the inspection procedure. Replace the EVAP canister purge valve and continue with the cleaning procedure.
- If a diagnostic procedure directed you to replace the EVAP canister purge valve and no carbon particles were detected, replace the EVAP canister purge valve and return to diagnostic 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.