Hyundai Elantra: Engine Mechanical System / Repair procedures
Compession Pressure Inspection |
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| If the there is lack of power, excessive oil consumption or poor fuel economy, measure the compression pressure. |
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1. | Start the engine and turn the coolant temperature to 80 - 95 °C and stop. |
2. | Remove the engine cover (A). ![](images/repair_procedures-3279/3259/scnem12001d.gif)
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3. | Disconnect the injector connector (A). ![](images/repair_procedures-3279/3259/sdnem00001c.gif)
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4. | Remove the ignition coils. (Refer to Engine Electical System - "Ignition Coil") |
5. | Remove spark plugs. (Refer to Engine Electrical System - "Spark Plug") |
6. | Check the cylinder compression pressure. (1) | Insert a compression gauge into the spark plug hole. ![](images/repair_procedures-3279/3259/sdlm20101d.gif)
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(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. |
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(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. |
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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 |
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(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. |
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| If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past the gasket. |
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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). ![](images/repair_procedures-3279/3259/sdnem00001c.gif)
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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
Description
Specifications
Limit
General
TypeIn-line, DOHC Number of cylinders4 Bore75...
Troubleshooting
Symptom
Suspect area
Remedy
Engine misfire with abnormal internal lower engine noises...
Other information:
Description and operation
Description Abbreviation Expalnation ACUAirbag Control UnitADMAssist Door ModuleB_CANBody Controller Area NetworkBCMBody Control ModuleBCWBlind-Spot Collision WarningC_CANChassis Controller Area NetworkCLUCluster ModuleDATCDual Automatic Temp ControlDDMDriver Door ModuleESCElectronic Stability ProgramEMSEngine Ma..
The Hill-Start Assist Control (HAC)
helps prevent the vehicle from rolling
backwards when starting a vehicle from
a stop on a hill. The system operates the
brakes automatically for approximately
2 seconds and releases the brake after 2
seconds or when the accelerator pedal is
depressed.
WARNING
Always be ready to depress the
accelerator pedal when starting off on
a incline. The HAC activa..