Galant ES L4-2350cc 2.4L SOHC MFI (1997)
Compression Check: Testing and Inspection
1. Before inspection, check that the engine oil, starter and battery are normal. Also, set the vehicle to the following conditions:
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Engine coolant temperature should be 80 - 95° C (176 - 203° F).
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Lights, electric cooling fan and all accessories are "OFF".
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The transaxle must be in Neutral or Park.
2. Disconnect the spark plug cables.
3. Remove all of the spark plugs.
4. Disconnect the crankshaft position sensor connector.
NOTE: Doing this will prevent the engine control unit from carrying out ignition and fuel injection.
5. Cover the spark plug hole with a shop towel etc., and after the engine has been cranked, check that no foreign material is adhering to the shop
towel.
WARNING:
1. KEEP AWAY FROM THE SPARK PLUG HOLE WHEN CRANKING.
2. IF COMPRESSION IS MEASURED WITH WATER, OIL, FUEL, ETC., THAT HAS COME FROM CRACKS INSIDE THE
CYLINDER, THESE MATERIALS WILL BECOME HEATED AND WILL GUSH OUT FROM THE SPARK PLUG HOLE,
WHICH IS DANGEROUS.
6. Set compression gauge to one of the spark plug holes.
7. Crank the engine with the throttle valve fully open and measure the compression pressure. The standard value (at an engine speed of 250 - 400
RPM) is 1,350 kPa (192 psi). The minimum (at engine speed of 250 - 400 RPM) is 1,020 kPa (145 psi).
8. Measure the compression pressure for all the cylinders, and check that the pressure differences of the cylinders are below the limit. The limit is
100 kPa (14 psi).
9. If there is a cylinder with compression or a compression difference that is outside the limit, pour a small amount of engine oil through the spark
plug hole, and repeat the operations in steps 7 and 8.
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If the compression increases after oil is added, the cause of the malfunction is a worn or damaged piston ring and/or cylinder inner surface.
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If the compression does not rise after oil is added, the cause is a burnt or defective valve seat, or pressure is leaking from the gasket.
10. Connect the crankshaft position sensor connector.
11. Install the spark plugs and spark plug cables.
12. Use the scan tool to erase the diagnostic trouble codes.
NOTE: This will erase the problem code resulting from the crankshaft position sensor connector being disconnected.