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P1539 – Intake Manifold Runner Control Mechanical Fault

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Symptoms

  • Hesitation
  • Poor acceleration

Causes

  • Sticking linkage
  • Carbon buildup
  • Actuator wear

Diagnosis

  • Inspect IMRC linkage
  • Check actuator
  • Inspect intake

Repair

  • Clean IMRC
  • Replace actuator
  • Repair linkage
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