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Mazda CX-5 Service & Repair Manual: Compression Inspection

Mazda CX-5 Service & Repair Manual / Engine / General / Compression Inspection

WARNING:

1. Verify that the battery is fully charged..

2. Warm up the engine to the normal operating temperature.

3. Perform “Fuel Line Safety Procedures”..

4. Remove the following parts.

a. Plug hole plate..

b. Ignition coil/ion sensors..

c. Spark plugs..

d. Fuel pump relay

e. Fuel injector relay

5. Measure the compression pressure using the following procedure.

a. Press a compression gauge into the spark plug hole.


b. Fully depress the accelerator pedal.

c. Crank the engine and measure the compression pressure.

NOTE:

d. Perform Steps (1) to (3) for all cylinders.

e. If it is less than the minimum specification, or there is a cylinder with a maximum value that exceeds the other cylinders, add a small quantity of engine oil through the spark plug hole and perform Steps (1) to (3).

f. If the measured value is high, it is possible that there is an error in the electric variable valve timing system.

6. Remove the compression gauge.

7. Install the following parts.

a. Fuel injector relay

b. Fuel pump relay

c. Spark plugs..

d. Ignition coil/ion sensors..

e. Plug hole plate..

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