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Evaporative Emissions Symptom Chart: Notes

EVAPORATIVE EMISSIONS SYMPTOM CHART

Problem Possible Cause Action
  • Leakage In The Evaporative Emission (EVAP) Canister or Canister Vent Solenoid
  • Canister vent solenoid stuck open.
  • Weld seam leaks.
  • O-ring seal leaks.
See PINPOINT TEST 1: EXCESSIVE FUEL ODOR CANISTER VENT SOLENOID .
  • Blockage In The Evaporative Emission (EVAP) Canister Or Canister Vent Solenoid
  • EVAP canister blockage.
  • Canister vent solenoid blockage.
  • Canister vent solenoid output hose blockage.
See PINPOINT TEST 2: HISS WHEN OPENING FUEL CAP .