Compression 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. |
Warm up and stop engine.
Allow the engine to warm up to normal operating temperature.
|
| 2. |
Disconnect the injector connectors (A).
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| 3. |
Disconnect the ignition coil connectors (A).
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| 4. |
Remove ignition coils (A).
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| 5. |
Remove spark plugs (A).
Using a 16mm plug wrench, remove the 4 spark plugs.
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| 6. |
Check cylinder compression pressure.
| (1) |
Insert a compression gauge into the spark plug hole.
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| (2) |
Fully open the throttle.
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| (3) |
While cranking the engine, measure the compression pressure.
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Always use a fully charged battery to obtain engine
speed of 200 rpm or more.
|
|
| (4) |
Repeat steps (1) through (3) for each cylinder.
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This measurement must be done in as short a time
as possible.
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Compression pressure:
1,275 kPa (13.0 kgf/cm², 185 psi)
Minimum pressure:
1,128 kPa (11.5 kgf/cm², 164 psi)
Difference between each cylinder:
100 kPa (1.0 kgf/cm², 15 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.
| 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. |
Reinstall spark plugs.
Tightening torque:
14.7 ~ 24.5 N.m (1.5 ~ 2.5 kgf.m, 10.8 ~ 18.1 lb-ft)
|
|
| 8. |
Install ignition coils.
Tightening torque:
9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
|
|
| 9. |
Connect the injector connectors and ignition coil connectors.
|
| 10. |
Some DTCs may exist after the inspection test and may need to
be manually cleared with GDS.
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Specifications
Description
Specifications
Limit
General
Type
In-line, DOHC
Numbe ...
Troubleshooting
Symption
Suspect area
Remedy
Engine misfire with abnormal internal lower engine noises
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Hyundai Elantra MD/UD: Repair procedures
