P1433 – EVAP System Incorrect Purge Flow (Ford)

Description

P1433 Ford indicates incorrect purge flow has been detected in the EVAP system.

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Symptoms

  • Rough idle
  • Fuel smell
  • Poor fuel economy

Causes

  • Faulty purge valve
  • Vacuum leak
  • Clogged canister

Diagnosis

  • Test purge flow
  • Inspect canister
  • Smoke test EVAP

Repair

  • Replace purge valve
  • Clean or replace canister
  • Repair leaks

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