Engine Compression Inspection - Honda 2004 Odyssey Service Manual

Engine Compression Inspection

1. Warm up the engine to normal operating
temperature (cooling fan comes on).
2. Turn the ignition switch OFF.
3. Remove the ACGS (15A) fuse from the under-hood
fuse/relay box.
4. Start the engine and let it run until it stalls.
5. Remove the six ignition coils (see page 4-17).
6. Remove the six spark plugs.
7. Attach the compression gauge to a spark plug hole.
8. Connect a tachometer.
9. Open the throttle fully, then crank the engine with
the starter motor and measure the compression.
Compression Pressure
Above 930 kPa (9.5 kgf/cm , 135 psi)
10. Perform the same measurement on the remaining
cylinders.
Maximum Variation:
Within 200 kPa (2.0 kgf/cm , 28 psi)
11. If the compression is not within specifications,
check the following items, then re-measure the
compression.
• Damaged or worn valves and seats
• Damaged cylinder head gasket
• Damaged or worn piston rings
• Damaged or worn piston and cylinder bore
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