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P1580 – Idle Speed Control Mechanical Fault

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Symptoms

  • Rough idle
  • Stalling

Causes

  • Sticking IAC valve
  • Carbon buildup
  • Throttle body wear

Diagnosis

  • Inspect IAC movement
  • Check throttle body
  • Inspect intake

Repair

  • Replace IAC valve
  • Clean throttle body
  • Repair intake
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