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.
2004 Hyundai XG350 BaseFACTORY OEM SERVICE PROCEDURE
Emissions Control System: General: Troubleshooting
PROBLEM SYMPTOM TABLE - EMISSIONS CONTROL SYSTEM
| Symptom | Probable cause | Remedy |
|---|---|---|
| Engine will not start or hard to start | Vacuum hose disconnected or damaged EGR valve is not closed Malfunction of the EVAP Canister Purge Solenoid Valve |
Repair or replace Repair or replace Repair or replace |
| Rough idle or engine stalls | Vacuum hose disconnected or damaged EGR valve is not closed Malfunction of the PCV valve Malfunction of the EVAP Canister Purge System |
Repair or replace Repair or replace Replace Check the system; if there is a problem, check its component parts |
| Excessive oil consumption | Positive crankcase ventilation line clogged | Check positive crankcase ventilation system |
| Poor fuel mileage | Malfunction of the exhaust gas recirculation | Check the system; if there is a problem, check its componentparts |
| Engine hesitates or poor acceleration | Malfunction of the exhaust gas recirculationsystem | Check the system; if there is a problem, check its component parts |
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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