Hyundai Elantra: Engine Mechanical System / Repair procedures

Hyundai Elantra (CN7) 2021-2024 Service Manual / Engine Mechanical System / Repair procedures

Compession Pressure Inspection

•	If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure.

1.	Start the engine and turn the coolant temperature to 80 - 95 °C and stop.

2.	Remove the engine cover (A).

3.	Disconnect the injector connector (A).

4.	Remove the ignition coils. (Refer to Engine Electical System - "Ignition Coil")

5.	Remove spark plugs. (Refer to Engine Electrical System - "Spark Plug")

Check the cylinder compression pressure.

(1)	Insert a compression gauge into the spark plug hole.

(2)	Fully open the throttle valve.

(3)

While cranking the engine, measure the compression pressure.

•	Always use a fully charged battery to obtain engine speed of 200 rpm or more.

(4)

Repeat steps (1) through (3) for each cylinder.

•	If you need to check the compression pressure for more than three times, restart the engine to restore the lubrication condition to be normal and then check the compression pressure again.

Compression pressure

Standard : 1,127.76 kPa (11.5 kgf/cm², 164 psi) (200-250 rpm)

Minimum : 980.66 kPa (10.0 kgf/cm², 142 psi)

Difference between each cylinder : 98 kPa (1.0 kgf/cm², 14 psi) 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.	Install the spark plugs. (Refer to Engine Electrical System - "Spark Plug")

8.	Install the ignition coil. (Refer to Engine Electical System - "Ignition Coil")

9.	Connect the injector connector (A).

10.	Some DTCs may exist after the inspection test and may need to be manually cleared with diagnostic tool.

11.	Install the engine cover. (Refer to Engine and Transaxle Assembly - "Engine Cover")

Specifications

Specifications Description Specifications Limit General TypeIn-line, DOHC 　Number of cylinders4 　Bore75...

Troubleshooting

Troubleshooting Symptom Suspect area Remedy Engine misfire with abnormal internal lower engine noises...

Other information:

Hyundai Elantra (CN7) 2021-2024 Service Manual: Special service tools

Special Service Tools Tool Name / Number Illustration Description Alternator pulley remover wrenchh09373-27000Removal and installation of alternator pulley ..

Hyundai Elantra (CN7) 2021-2024 Service Manual: ESC OFF Switch

Description and operation Description1.The ESP OFF switch is for the user to turn off the ESP system.2.The ESP OFF lamp is on when ESP OFF switch is engaged. Repair procedures Removal1.Turn ignition switch OFF and disconnect the negative (-) battery cable.2.Remove the crash pad lower pannel.(Refer to Body - "Crash Pad Lower Pannel")3.Loosen the screw and than removing the ESC OFF switc..

Steering wheel audio control

The steering wheel audio control switches are installed for your convenience.

NOTICE

Do not operate audio remote control buttons simultaneously.

VOLUME (VOL + / VOL -) (1)

Move the VOLUME toggle switch up to increase volume. Move the VOLUME toggle switch down to decrease volume.