Mazda 3 Workshop Manual page 695

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Warning
• Hot engines and oil can cause severe burns. Be careful not to burn yourself during
removal/installation of each component.
1. Verify that the battery is fully charged.
• Recharge it if necessary. (See
2. Warm up the engine to the normal operating temperature.
3. Stop the engine and allow it to cool down for about 10 min.
4. Perform "Fuel Line Safety Procedures". Leave the fuel pump relay removed. (See
PRECAUTION.)
Warning
• Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always
keep sparks and flames away from fuel.
• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death
and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line
Safety Procedure". (See
5. Remove the plug hole plate (See
6. Remove the ignition coils. (See
7. Remove the spark plugs. (See
8. Connect a compression gauge into the spark plug hole.
9. Fully depress the accelerator pedal and crank the engine.
10. Note down the maximum gauge reading.
11. Inspect each cylinder as above.
• If the measured value is less than the limited value, or there is a cylinder whose compression
value varies from that of other cylinders by 196.1 kPa {2.0 kgf/cm
small amount of engine oil through the spark plug hole. Then measure the compression pressure
and perform the respective operations for the following cases.
- If the compression increases, the piston, the piston rings, or cylinder wall may be worn and
overhaul is required.
- If the compression stays low, a valve may be stuck or improperly seated and overhaul is
required.
- If the compression in adjacent cylinders stays low, the cylinder head gasket may be damaged or
the cylinder head distorted and overhaul is required.
Compression
2
kPa {kgf/cm , psi} [rpm]
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BATTERY INSPECTION.)
Fuel Line Safety Procedure.)
PLUG HOLE PLATE REMOVAL/INSTALLATION
IGNITION COIL REMOVAL/INSTALLATION
SPARK PLUG REMOVAL/INSTALLATION
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B3E011002000W02
BEFORE SERVICE
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