P1427 – EVAP System Excessive Vacuum (Ford)

Description

P1427 Ford indicates excessive vacuum has been detected in the EVAP system.

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Symptoms

  • Rough idle
  • Hard starting
  • Fuel smell

Causes

  • Stuck purge valve
  • Blocked vent valve
  • Vacuum leak

Diagnosis

  • Test purge valve
  • Inspect vent valve
  • Smoke test EVAP

Repair

  • Replace purge valve
  • Replace vent valve
  • Repair leaks