No.21 Engine Noise: Notes
ENGINE NOISE DESCRIPTION & POSSIBLE CAUSE TABLE
| 21 |
ENGINE NOISE |
| DESCRIPTION |
Engine noise from under the hood |
| POSSIBLE CAUSE |
Squeal, click or chirp noise:
- Improper engine oil level
- Improper drive belt tension
Rattle sound noise:
Hissing noise:
- Vacuum leakage
- Loose spark plug
- Air leakage from intake-air system
- Improper variable fresh air duct (VFAD) control system operation (13B-MSP (High Power))
Rumble or grind noise:
- Improper drive belt tension
Rap or roar noise:
Other noise:
- Oil pump drive gear noise
- Oil pump drive chain noise
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