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Kia Sorento: Repair procedures - Engine Mechanical SystemKia Sorento: Repair procedures

Kia Sorento (MQ4, 2021-2026) Service Manual / Engine Mechanical System / Repair procedures

Compression Pressure Inspection
Note
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.
1.
Start the engine until coolant temperature goes up to 80-95°C and stop the engine.
2.
Disconnet the MPI injector connectors (A).

Engine Mechanical System — Repair procedures / Compression Pressure Inspection illustration
3.
Disconnet the GDI injector connector (A).

Engine Mechanical System — Repair procedures / Compression Pressure Inspection illustration
4.
Remove the ignition coils.
(Refer to Engine Electrical System - "Ignition Coil")
5.
Remove the spark plugs.
Using a 16mm plug wrench, remove the 4 spark plugs.
(Refer to Engine Electrical System - "Spark Plug")
6.
Check cylinder compression pressure
(1)
Insert a compression gauge into the spark plug hole

Engine Mechanical System — Repair procedures / Compression Pressure Inspection illustration

(2)
Fully open the throttle valve.
(3)
Measure the compression pressure after at least 20 rotations while cranking the engine with the throttle valve opened.
Note
Always use a fully charged battery to obtain engine speed of 200 rpm or more.
(4)
Repeat steps (1) through (3) for each cylinder.
Note
This measurement must be done in as short a time as possible.
Compression pressure [kPa(kg/cm², psi)] :
1,559 (15.9, 226) / 200 - 250 rpm
Minimum pressure [kPa(kg/cm², psi)] :
1,412 (14.4, 204)
Difference between each cylinder [kPa(kg/cm², psi)] :
98.07 (1.0, 14.22) or less
(5)
If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps (1) through (3) for cylinders with low compression.
•
If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
•
If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket.
7.
Reinstall the spark plugs.
(Refer to Engine Electrical System -"Spark Plug")
8.
Install the ignition coils.
(Refer to Engine Electrical System -"Ignition Coil")
9.
Some DTC's code may exist after the inspection test and may need to be manually cleared with KDS.
Lubricant
Lubricant Description Specifications Limit Engine oil Oil quantity Total 6.8ℓ (1.8 U.S.gal., 7.2 U.S....
Troubleshooting
Troubleshooting Symptom Probable Cause Remedy Engine misfire with abnormal internal lower engine noises. ...
See also:

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