Auto Systems and Repair: Timing Belt Idler

Symptoms of Wear or Failure

  • Grinding or roaring type noise from inside the timing cover
  • Belt may "jump time" (skipping a tooth or more, usually on the cam gear). This results in a loss of synchronization and engine performance.
  • Trouble codes from the camshaft or crankshaft sensors, causing Check Engine Light to illuminate
  • Slapping or scraping noises from engine

Related Repair Advice

  • It is often recommended that you replace the idler(s) along with items like the water pump, front engine seals, drive belts, and tensioner any time the timing belt is replaced

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