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P1543 – Intake Manifold Runner Control Range/Performance (Bank 1)

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Symptoms

  • Hesitation
  • Poor fuel economy

Causes

  • Faulty actuator
  • Wiring issue
  • Carbon buildup

Diagnosis

  • Command IMRC actuator
  • Inspect wiring
  • Check intake

Repair

  • Replace actuator
  • Repair wiring
  • Clean intake
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