Emissions Control System: General: Troubleshooting
SYMPTOM CHART
| Symptom | Function | Remedy |
|---|---|---|
| Engine will not start or hard to start | Vacuum hose disconnected or damaged | Repair or replace |
| EGR valve is not closed | Repair or replace | |
| Malfunction of the Purge Control Solenoid Valve (PCSV) | Repair or replace | |
| Rough idle or engine stalls | Vacuum hose disconnected or damaged | Repair or replace |
| EGR valve is not closed | Repair or replace | |
| Malfunction of the PCV valve | Repair or replace | |
| Malfunction of the EVAP Canister Purge System and EGR Control System | Check the system; if there is a problem, check its component parts | |
| Exhaust Emission System | 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 component parts |
| Engine hesitates or poor acceleration | Malfunction of the exhaust gas recirculation system | Check the system; if there is a problem, check its component parts |