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Emission Control System - General Information: Troubleshooting

EMISSION CONTROL SYSTEM TROUBLESHOOTING

Symptom Suspected area
Engine will not start or hard to start Vapor hose damaged or disconnected
Engine struggles to start Malfunction of the Purge Control Solenoid Valve
Rough idle or engine stalls Vapor hose damaged or disconnected
  Malfunction of the PCV valve
Rough idle Malfunction of the Evaporative Emission Control System
Excessive oil consumption Positive crankcase ventilation line clogged