Hyundai Elantra: Engine Mechanical System / Repair procedures

Hyundai Elantra (CN7) 2021-2025 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) 2021-2025 Owner's Manual: Inside Rearview Mirror

Before driving your vehicle, check to see that your inside rearview mirror is properly positioned. Adjust the rearview mirror so that the view through the rear window is properly centered. WARNING Make sure your line of sight is not obstructed. Do not place objects in the rear seat, cargo area, or behind the rear head restraints which could interfere with your vision through the rear wind..

Hyundai Elantra (CN7) 2021-2025 Service Manual: Dual Clutch Assembly

Components and components location Components1. Dual clutch assembly2. Snap ring3. Spline hub4. Retaining ring Repair procedures Removal1.Remove the dual clutch transmission from the vehicle.(Refer to Dual Clutch System - "Repair procedures")2.Remove the retaining (A) and then removing the spline hub (B).3. Remove the snap ring (A).4.Remove the dual clutch assembly (A) by using the spe..

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.