No.21 Engine Noise - Mazda CX-7 2007 Workshop Manual

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
NO.21 ENGINE NOISE[L3 WITH TC]
21 ENGINE NOISE
DESCRIPTION Engine noise under hood
Squeal, click or chirp noise:
• Improper engine oil level
• Loose installation of solenoid valves
• Improper drive belt tension
Rumble or grinding sound noise:
• Loose parts
• Fluid revel low or air in power the steering fluid
• Improper drive belt tension
Hiss sound noise:
• Vacuum leakage
• Loose spark plug
• Air leakage from the intake-air system
Rattle noise:
• Loose parts
Rap or roar noise:
• Exhaust system looseness
Excessive noise from turbocharger:
• Foreign objects or material in the compressor inlet to the intake manifold ducting or the compressor
housing
• Carbon built-up in the turbine housing
• Turbocharger routing assembly banding or dragging
• Loose intake or exhaust ducting systems
POSSIBLE CAUSE
Other noise:
• Camshaft friction gear noise or MLA noise
• Timing chain noise
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and
• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always
• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or
Caution
• Disconnecting/connecting the quick release connector without cleaning it may possibly
Diagnostic procedure
STEP INSPECTION
1 Is the noise from the turbocharger?
2 Is squeal, click or chirp sound present?
3 Is rumble or grinding sound present?
4 Is rattle sound present?
01-03–66
repair procedures. Read the following warnings before performing the fuel system
services:
keep sparks and flames away from fuel.
death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete
"BEFORE REPAIR ROCEDURE" and "AFTER REPAIR PROCEDURE" described in this
manual.
(See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC].)
(See01-14-4 AFTER REPAIR PROCEDURE[L3 WITH TC].)
cause damage to the fuel pipe and quick release connector. Always clean the quick release
connector joint area before disconnecting/connecting, and make sure that it is free of
foreign material.
RESULTS
Yes Go to Step 8.
No Go to the next step
Yes Inspect the engine oil level, solenoid valves installation
or drive belt tension.
No Go to the next step.
Yes Inspect and repair the following;
• Drive belt tension
• Loose parts in engine compartment
• Power steering system fluid level
If normal, perform the power steering fluid line air
bleed.
(See06-14-3 AIR BLEEDING.)
No Go to the next step.
Yes Inspect the location of rattle for loose parts.
No Go to the next step.
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