Mazda CX-9 Grand Touring 2009 Manual page 1370

Rattle sound noise:
Hiss sound noise:
POSSIBLE CAUSE Rumble or grind noise:
Rap or roar noise:
Other noise:
DIAGNOSTIC PROCEDURE
NO.21 ENGINE NOISE (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP INSPECTION
Is a squealing, click or
1
chirping sound present?
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Generator installation (alignment)
Splash shield or under cover looseness (splashed water to drive belts)
Loose parts
vacuum leakage
Loose spark plug
Air leakage from intake-air system
Improper drive belt tension
Improper P/S fluid level
Dynamic dumper looseness
Exhaust system looseness
Intake-air system looseness
Camshaft friction gear noise or MLA noise
Timing chain noise
RESULTS
Inspect for the followings:
Yes
ACTION
Engine oil level
Drive belt tension
Splash shield or under cover looseness