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 MANUALSHYUNDAI2002ELANTRA GT HATCHBACK L4-2.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTUNE-UP AND ENGINE PERFORMANCE CHECKSCOMPRESSION CHECKTESTING AND INSPECTION
2002 Hyundai Elantra GT Hatchback L4-2.0L
Compression Check: Testing and Inspection
2002 Hyundai Elantra GT Hatchback L4-2.0LSECTION Testing and Inspection
CHECKING COMPRESSION PRESSURE
1. Before checking engine compression, check the engine oil level. Also check that the starter motor and battery are all in normal operating condition.
2. Start the engine and wait until engine coolant temperature reaches 80 - 95°C (176 - 205°F).
3. Turn off engine and disconnect the spark plug cables.
4. Remove the spark plugs.
5. Crank the engine to remove any foreign material in the cylinders.
6. Insert the compression gauge into the spark plug hole.
7. Depress the accelerator pedal to open the throttle fully.
8. Crank the engine and read the gauge.
Standard value: 1500 kPa (15 kg/cm2, 218 psi)
Limit: 1400 kPa (14 kg/cm2, 203 psi)
9. Repeat steps 6 to 8 over all cylinders, ensuring that the pressure differential for each of the cylinders is within the specified limit.
Limit: Maximum 100 kPa (1.0 kg/cm2 14 psi) between cylinders
10. If a cylinder's compression or pressure differential is outside the specification, add a small amount of oil through the spark plug hole, and repeat steps 6 to 9.
1) If the addition of oil makes the compression to rise, it is likely that there may be wear between the piston ring and cylinder wall
2) If compression remains the same, valve seizure, poor valve seating or a compression leak from the cylinder head gasket are all possible causes.
Tightening torque
Spark plug: 20 - 30 Nm (200 - 300 kg.cm, 14 - 22 ft. lbs.)
1. Before checking engine compression, check the engine oil level. Also check that the starter motor and battery are all in normal operating condition.
2. Start the engine and wait until engine coolant temperature reaches 80 - 95°C (176 - 205°F).
3. Turn off engine and disconnect the spark plug cables.
4. Remove the spark plugs.
5. Crank the engine to remove any foreign material in the cylinders.
6. Insert the compression gauge into the spark plug hole.
7. Depress the accelerator pedal to open the throttle fully.
8. Crank the engine and read the gauge.
Standard value: 1500 kPa (15 kg/cm2, 218 psi)
Limit: 1400 kPa (14 kg/cm2, 203 psi)
9. Repeat steps 6 to 8 over all cylinders, ensuring that the pressure differential for each of the cylinders is within the specified limit.
Limit: Maximum 100 kPa (1.0 kg/cm2 14 psi) between cylinders
10. If a cylinder's compression or pressure differential is outside the specification, add a small amount of oil through the spark plug hole, and repeat steps 6 to 9.
1) If the addition of oil makes the compression to rise, it is likely that there may be wear between the piston ring and cylinder wall
2) If compression remains the same, valve seizure, poor valve seating or a compression leak from the cylinder head gasket are all possible causes.
Tightening torque
Spark plug: 20 - 30 Nm (200 - 300 kg.cm, 14 - 22 ft. lbs.)
RENDER: 1.0x
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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.