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Home >> Mazda >> 2007 >> 6 i, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine Control System L3) >> No. 21 Engine Noise >> Notes

No. 21 Engine Noise: Notes

POSSIBLE CAUSE DESCRIPTION

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