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.
Engine Compression Test
2021 Kia Sedona EXSECTION Engine Compression Test
- Warm up the engine to normal operating temperature.
- Remove the fuel pump fuse.
- Wait until the engine stopped.
- Remove the ignition coils and spark plugs.
- Crank the engine to remove any foreign material in the cylinders.
- Put a compression pressure gauge into spark plug hole.
- Check compression pressure at each cylinder.
Specification: 14kg/cm2 (250 to 400 RPM)
Good
- Go to "CHECK TIMING " procedure.
No Good
- Add a small amount of oil through the spark plug hole, and repeat above steps. If the addition of oil causes the compression to rise, the cause is a worn or damaged piston ring or cylinder inner surface.
- If the compression on each cylinder is not the same or not similar a burnt or defective valve seat, worn head gasket and pressure rings can be the cause of vibration of engine.
- Repair or replace as necessary and go to "VERIFICATION OF REPAIR " procedure.
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.