Hyundai Sonata: General Information / Repair procedures
| Compession Pressure Inspection |
|
If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure. |
| 1. |
Make sure the oil in the crankcase is of the correct
viscosity and at the correct level and that the battery is correctly
charged. Operate the vehicle until the engine is at normal operating
temperature. Turn the ignition switch to the OFF position. |
| 2. |
Remove the engine cover. |
| 3. |
Disconnect the injector extension connector (A) and the ignition coil connectors (B). 
|
| 4. |
Remove the ignition coils (A). 
|
| 5. |
Remove the spark plugs.
Using a 16mm plug wrench, remove the 4 spark plugs. |
| 6. |
Check the cylinder compression pressure.
| (1) |
Insert a compression gauge into the spark plug hole. 
|
| (2) |
Set the throttle plate in the wide-open position. |
| (3) |
While cranking the engine, measure the compression pressure.
|
Always use a fully charged battery to obtain engine speed of 250rpm or more. |
|
| (4) |
Repeat step 1) through 3) for each cylinder.
|
This measurement must be done in as short time as possible. |
Compression pressure
Standard : 1225.83kPa (12.5kg/cm?, 177.79psi) (200~250 rpm)
Minimum : 1078.73kPa (11.0kg/cm?, 156.46psi)
Difference between each cylinder :
98kPa (1.0kg/cm?, 14psi) or less
|
|
| (5) |
If the cylinder compression in one or more cylinders is low,
pour a small amount of engine oil into the cylinder through the spark
plug hole and repeat step 1) through 3) for cylinders with low
compression.
| A. |
If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged. |
| B. |
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.
Tightening torque :
7.8 ~ 9.8N.m (0.8 ~ 1.0kgf.m, 5.8 ~ 7.2lb-ft)
|
|
| 8. |
Install the ignition coil.
Tightening torque :
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
|
|
| 9. |
Connect the injector extension connector and the ignition coil connectors. |
| 10. |
Install the engine cover. |
Specifications
DescriptionSpecificationsLimitGeneralTypeIn-line, DOHC?Number of cylinders4?Bore77mm (3.0315in)?Stroke85.44mm (3.3638in)?Total displacement1,591 cc (97.09 cu.in)?Compression ratio9 ...
Troubleshooting
SymptomSuspect areaRemedyEngine misfire with abnormal internal lower engine noises.Loose or improperly installed engine flywheel.Repair or replace the flywheel as required.Worn pi ...
Other information:
Hyundai Sonata LF 2014-2019 Owners Manual: System malfunction
When the "Check Driver Attention Alert" warning message appears, the system is
not working properly. In this case, we recommend you to have the vehicle inspected
by an authorized HYUNDAI dealer.
WARNING
The Driver Attention Alert system is not a substitute for safe driving
practices, but a co ...
Hyundai Sonata LF 2014-2019 Service Manual: Photo Sensor Repair procedures
Inspection
1.
Turn the ignition switch ON.
2.
Connect the GDS.
3.
Emit intensive light toward the photo sensor using a lamp, and check the output voltage change.
4.
The voltage will rise with higher intensive light and reduce with lower intensive light.
1. Auto light signal2. Auto ...
Specifications
Troubleshooting