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No. 21 Engine Noise: Notes

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DESCRIPTION & POSSIBLE CAUSE

21 ENGINE NOISE
DESCRIPTION  Engine noise from under hood
POSSIBLE CAUSE  Squeal, click or chirp noise: 
  • Improper engine oil level
  • Improper drive belt tension

Rattle sound noise: 
  • Loose parts

Hiss sound noise: 
  • Vacuum leakage
  • Loose spark plug
  • Air leakage from intake-air system
  • Improper variable air duct (VAD) control system operation

Rumble or grind noise: 
  • Improper drive belt tension

Rap or roar noise: 
  • Exhaust system looseness

Other noise: 
  • Camshaft friction gear noise or MLA noise
  • Timing chain noise