DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
POSSIBLE CAUSE
z
Air leakage from intake-air system
Rumble or grind noise:
z
Improper drive belt tension
z
Improper P/S fluid level
Rap or roar noise:
z
Dynamic dumper looseness
z
Exhaust system looseness
z
Intake-air system looseness
Other noise:
z
Camshaft friction gear noise or MLA noise
z
Timing chain noise
STEP INSPECTION
RESULTS ACTION
1
Is a squealing, click or chirping sound
present?
Yes
Inspect for the followings:
z
Engine oil level
z
Drive belt tension
z
Splash shield or under cover
looseness
z
Generator installation (alignment)
No
Go to the next step.
2
Is a rumbling or grinding noise
present?
Yes
Inspect for the followings:
z
Drive belt tension
z
P/S fluid level
No
Go to the next step.
3
Is a rattling noise present?
Yes
Inspect rattling location for loose parts.
No
Go to the next step.
4
Is a hissing noise present?
Yes
Inspect for the following:
z
Vacuum leakage
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
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