Compression Test How-To
Aug 3, 2005, 11:57 PM
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Compression Test How-To
Tools:
Compression Tester (can get from Autozone ect.)
Socket Wrench
Socket Extender
10mm socket (for spark plug cover)
13/16 Spark Plug Socket
Torque Wrench
From the shop manual:
COMPRESSION PRESSURE CHECK M1111002600421
1. Before inspection, check that the engine oil, starter and
battery are normal. Also, set the vehicle to the following
conditions:
• Engine coolant temperature: 80 − 95°C (176 − 203°F)
• Lights, and all accessories: OFF
• Transaxle: Neutral
2. Disconnect the spark plug cables.
3. Remove all of the spark plugs.
4. Disconnect the crankshaft position sensor connector (located next to oil cap, a triangular connector).
NOTE: Doing this will prevent the engine control module
from carrying out ignition and fuel injection.
WARNING
Keep your distance from the spark plug hole when
cranking. Oil, fuel, etc., may spray out from the spark
plug hole and may cause serious injury.
5. Cover the spark plug holes with a shop towel etc. Crank the
engine for a few seconds to clear debris from a round the
spark plug holes. After the engine has been cranked, check
for foreign material adhering to the shop towel.
6. Install the compression gauge to one of the spark plug
holes.
7. Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value (at engine speed of 250 r/min): 1,128
kPa (163 psi)
Minimum limit (at engine speed of 250 r/min): 951 kPa
(138 psi)
8. Measure the compression pressure for all the cylinders, and
check that the pressure differences of the cylinders are
below the limit.
Limit: 98 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 6 to 8.
(1) 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.
(2) 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 (Torque: 18 ft/lb) and spark plug cables.
12.Use the scan tool (or disconnect battery for 1 min) to erase the diagnostic trouble codes.
NOTE: This will erase the diagnostic trouble code resulting
from the crankshaft position sensor connector being discon-
nected.
/manual
I got 175 on all cylinders, which is high (good). Good luck.
Compression Tester (can get from Autozone ect.)
Socket Wrench
Socket Extender
10mm socket (for spark plug cover)
13/16 Spark Plug Socket
Torque Wrench
From the shop manual:
COMPRESSION PRESSURE CHECK M1111002600421
1. Before inspection, check that the engine oil, starter and
battery are normal. Also, set the vehicle to the following
conditions:
• Engine coolant temperature: 80 − 95°C (176 − 203°F)
• Lights, and all accessories: OFF
• Transaxle: Neutral
2. Disconnect the spark plug cables.
3. Remove all of the spark plugs.
4. Disconnect the crankshaft position sensor connector (located next to oil cap, a triangular connector).
NOTE: Doing this will prevent the engine control module
from carrying out ignition and fuel injection.
WARNING
Keep your distance from the spark plug hole when
cranking. Oil, fuel, etc., may spray out from the spark
plug hole and may cause serious injury.
5. Cover the spark plug holes with a shop towel etc. Crank the
engine for a few seconds to clear debris from a round the
spark plug holes. After the engine has been cranked, check
for foreign material adhering to the shop towel.
6. Install the compression gauge to one of the spark plug
holes.
7. Crank the engine with the throttle valve fully open and
measure the compression pressure.
Standard value (at engine speed of 250 r/min): 1,128
kPa (163 psi)
Minimum limit (at engine speed of 250 r/min): 951 kPa
(138 psi)
8. Measure the compression pressure for all the cylinders, and
check that the pressure differences of the cylinders are
below the limit.
Limit: 98 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 6 to 8.
(1) 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.
(2) 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 (Torque: 18 ft/lb) and spark plug cables.
12.Use the scan tool (or disconnect battery for 1 min) to erase the diagnostic trouble codes.
NOTE: This will erase the diagnostic trouble code resulting
from the crankshaft position sensor connector being discon-
nected.
/manual
I got 175 on all cylinders, which is high (good). Good luck.
Last edited by Ninj0x; Aug 19, 2006 at 02:17 PM.
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Aug 18, 2006, 03:17 PM
#11
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You can rent a gauge from Autozone or buy one on the internet (http://www.sjdiscounttools.com/kd2428.html).
