Camshaft phaser failure: these are the symptoms

by Pramith

When the camshaft phaser malfunctions and fails to perform its service, it is hard to ignore because the symptoms are quite obvious.

Typical symptoms of a defective camshaft phaser

A faulty camphaser can severely affect engine operation and should be taken seriously, as the symptoms are often easily recognizable, but differ depending on the severity of the defect.

  • Irregular engine operation: The engine may run roughly at idle speed and vibrate irregularly. This is a common sign, as the camshaft phasing unit is responsible for controlling the timing of the valves. If the valves are not controlled correctly, engine performance will suffer.
  • Jerky acceleration: A defective camshaft phasing unit affects the torque, which can lead to noticeable jerking, especially at low speeds or when starting up. The engine’s response is then delayed and less dynamic.
  • Warning light in the cockpit: In modern vehicles, the defect is often signaled by the engine control light. This is activated when the control unit detects irregularities in the camshaft phaser.

Immediate measures and long-term solutions

If you suspect a defective camshaft phaser, you should take the following steps:

  • Read the fault memory: Have the vehicle’s fault memory read to identify specific fault codes. This will help to diagnose the problem accurately.
  • Change the oil: Contaminated or old engine oil can impair the function of the camshaft phaser. Changing the oil can help.
  • Professional diagnosis: A specialist workshop can use special diagnostic equipment to check the condition of the camshaft phaser and recommend further action.
  • Replacing the cam phaser: If the damage is irreparable, the cam phaser must be replaced. The costs vary depending on the vehicle type and are between 700 and 1,000 euros.

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