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P1505 – Idle Air Control System Stuck Open

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Symptoms

  • High idle
  • Hanging RPM
  • Poor fuel economy

Causes

  • Carbon buildup
  • Valve failure
  • Vacuum leak

Diagnosis

  • Inspect IAC valve
  • Check vacuum lines
  • Scan ECU

Repair

  • Clean or replace IAC
  • Repair vacuum leaks
  • Update ECU
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