No. 21 Engine Noise: Notes
NO. 21 ENGINE NOISE REFERENCE CHART (MZI-3.7)
| 21 |
ENGINE NOISE |
| DESCRIPTION |
- Engine noise from under hood
|
| POSSIBLE CAUSE |
Squeal, click or chirp noise:
- Improper engine oil level
- Improper drive belt tension
- Auto tensioner bearing malfunction
- Improper installation of purge solenoid valve
- Generator installation (alignment)
- Splash shield or under cover looseness (splashed water to drive belts)
Rattle sound noise:
Hiss sound noise:
- Vacuum leakage
- Loose spark plug
- Air leakage from intake-air system
Rumble or grind noise:
- Improper drive belt tension
- Improper P/S fluid level
Rap or roar noise:
- Dynamic dumper looseness
- Exhaust system looseness
- Intake-air system looseness
- Variable valve timing actuator malfunction
Other noise:
- Camshaft friction gear noise or tappet noise
- Timing chain noise
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