21 Engine Noise [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING
• If malfunction remains, inspect related Service information perform repair or diagnosis.
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
21
Engine noise from under hood
DESCRIPTION
Squeal, click or chirp noise:
• Improper engine oil level
• Improper drive belt tension
• Generator installation (alignment)
• Splash shield or under cover looseness (splashed water to drive belt)
Rattle sound noise:
• Loose parts
Hiss sound noise:
• Vacuum leakage
• Loose spark plug
POSSIBLE CAUSE
• Air leakage from intake-air system
Rumble or grind noise:
• Improper drive belt tension
• Improper P/S fluid level
Rap or roar sound noise:
• Dynamic damper looseness
• Exhaust system looseness
• Intake-air system looseness
Other noise:
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NO.21 ENGINE NOISE [Z6]
ENGINE NOISE
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