Wet Compression Test
Once you've found out which is the cylinder (or cylinders) with low compression, the next step is to add about 1 to 2 teaspoons of oil to the cylinder and repeat the compression test.
Now, if the reason, why the compression was low, is due to a problem with worn out piston rings, the oil will make the worn out rings seal and the compression value (as recorded by your compression tester) will go up.
If the compression value doesn't go up, then now you know that the problem is in the cylinder head valves and not in the piston rings.
OK, this is what you need to do:
- Add the engine Oil to the cylinder with low to no compression.
- Remember, you should add about 1 to 2 teaspoons of oil.
- Install the compression tester onto the cylinder.
- Hand tight is fine. Don't use any type of tool to tighten it.
- When all is set up, have your helper crank the engine.
- Only one of two results is possible. Your compression tester will either:
- Record a higher reading than the one recorded before.
- Or the stay the same as before.
Let's see what your compression test result means:
CASE 1: The compression value shot up. This tells you that the piston compression rings are worn out and thus the problem is in the bottom end.
CASE 2: The compression Value stayed the same. This confirms that the problem is in the cylinder head valves.
You can find a complete list of Suzuki test articles here: Suzuki Index Of Articles.
Here's a list of articles you'll find there:
- How To Test The Ignition Coils Suzuki: Swift, Vitara - Chevy: Metro, Tracker.
- How To Troubleshoot A Misfire (Suzuki 1.3L, 1.6L, 1.8L, 2.0L, 2.3L).
- How To Test The 2.5L COP Coils.
If this info really saved the day, buy me a beer!