A compression test is usually done to check the engine on a racing car or high-performance car. These tests are run to find problems with the machine or measure and improve the performance of the machine. Some basic automotive knowledge will help if you want to learn how to perform a compression test.
Step
Step 1. Start the engine until it reaches normal temperature
It can be done this way..
- If you haven't started the car, the engine is still cold. Start the engine as usual and let it sit for a few minutes, this is enough to heat the engine to its normal temperature. But don't get too hot. Usually 20 minutes is enough..
- Turn off the engine and let the engine cool down if you have just driven your car. If the engine is still hot, wait about 1 hour before you start the test.
- If you can't start the engine, just run this test anyway. Even if you can't check the engine's performance accurately, you can still diagnose engine damage if it's caused by low compression.
Step 2. Turn off the engine before you start
Step 3. Disconnect the gas station relay
This will turn off the gas pump so that gasoline is not sprayed on the cylinder chamber.
Step 4. Disconnect the electrical plug from the coil
This will turn off the ignition system, and will not fire the spark plugs.
Step 5. Remove the spark plug and wire
Do it carefully because the ceramic insulator on the spark plug can be damaged if you are careless.
Step 6. Install the compression gauge in the first cylinder bore (the hole closest to the fan belt)
Do not use other tools to tighten the compression gauge, only use your hands.
Step 7. Ask someone else to start the engine
The needle on the compression gauge will rise and when it reaches the maximum, stop the engine starting. This number is the maximum compression number in the first cylinder.
