Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA2005CIVIC L4-1.7L CNGREPAIR AND DIAGNOSISMAINTENANCETUNE-UP AND ENGINE PERFORMANCE CHECKSCOMPRESSION CHECKTESTING AND INSPECTION
2005 Honda Civic L4-1.7L CNG
Compression Check: Testing and Inspection
2005 Honda Civic L4-1.7L CNGSECTION Testing and Inspection
Engine Compression Inspection
1. Warm up the engine to normal operating temperature (cooling fan comes on).
2. Turn the ignition switch OFF.
3. Remove the air cleaner housing.
4. Disconnect all four injector connectors.
5. Remove the four ignition coils.
6. Remove the four spark plugs.
7. Attach the compression gauge to the spark plug hole.
8. Connect a tachometer.
9. Open the throttle fully, then crank the engine with the starter motor and measure the compression.
Compression Pressure:
Above 930 kPa (9.5 kgf/cm2, 135 psi)
10. Measure the compression on the remaining cylinders.
Maximum variation:
Within 200 kPa (2.0 kgf/cm2, 28 psi)
11. If the compression is not within specifications, check the following items, then re-measure the compression.
^ Damaged or worn valves and seats
^ Damaged cylinder head gasket
^ Damaged or worn piston rings
^ Damaged or worn piston and cylinder bore
1. Warm up the engine to normal operating temperature (cooling fan comes on).
2. Turn the ignition switch OFF.
3. Remove the air cleaner housing.
4. Disconnect all four injector connectors.
5. Remove the four ignition coils.
6. Remove the four spark plugs.
7. Attach the compression gauge to the spark plug hole.
8. Connect a tachometer.
9. Open the throttle fully, then crank the engine with the starter motor and measure the compression.
Compression Pressure:
Above 930 kPa (9.5 kgf/cm2, 135 psi)
10. Measure the compression on the remaining cylinders.
Maximum variation:
Within 200 kPa (2.0 kgf/cm2, 28 psi)
11. If the compression is not within specifications, check the following items, then re-measure the compression.
^ Damaged or worn valves and seats
^ Damaged cylinder head gasket
^ Damaged or worn piston rings
^ Damaged or worn piston and cylinder bore
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.