Hi,
If there is a concern of a bent valve, the best thing to do would be simply perform a compression test on the engine. By doing that we can determine if there is an issue with any of the cylinders (specifically cylinder 2). However, before I would go to that extent, remove the spark plug from cylinder 2 and inspect it. Is it wet? What color is it? Is it getting spark? You could have a bad plug.
If the plug is getting spark, then do the compression test. Here is a link showing how it is done:
https://www.2carpros.com/articles/how-to-test-engine-compression
You will need a compression gauge, but most parts stores will lend you one.
Here are the directions specific to your vehicle including the manufacturer's specs. The attached pic correlates with these directions.
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2001 Honda Civic DX Sedan L4-1668cc 1.7L SOHC MFI
Component Tests and General Diagnostics
Vehicle Powertrain Management Tune-up and Engine Performance Checks Compression Check Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
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 air cleaner housing.
4. Disconnect all four injector connectors.
5. Remove the four ignition coils.
6. Remove the four spark plugs.
See Pic 1
7. Attach the compression gauge to the 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/cm2, 135 psi)
10. Measure the compression on the remaining cylinders.
Maximum variation:
Within 200 kPa (2.0 kgf/cm2, 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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Let me know if you decide to do it. If you have other questions, let me know.
Joe
Image (Click to make bigger)
Tuesday, April 14th, 2020 AT 9:11 AM