Kia Forte: Compression Pressure Inspection
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.
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2. |
Disconnect the injector connectors (A).
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3. |
Remove spark plugs.
(Refer to Engine Electrical System - "Spark Plug")
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4. |
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.
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.
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
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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.
A. |
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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B. |
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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|
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5. |
Install the other parts reverse order of removal.
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6. |
Some DTCs may exist after the inspection test and may need to
be manually cleared with GDS.
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Tool (Number and name)
Illustration
Use
Crankshaft front oil seal installer
09231-2E000
Installation of the front oil seal
Valv ...
Symption
Suspect area
Remedy
Engine misfire with abnormal internal lower engine noises
•
Worn crankshaft bearings
...