1. Start your vehicle as usual and keep the engine running for a few minutes. This should warm up the engine to its normal operating temperature.
2. Switch off the engine completely before beginning the test.
3. Remove electrical connection from the ignition coil. This will insure no spark could accidently start the engine when preforming the test.
4. Hold down the acceleration peddle all the way down. This will disable the injectors or remove the fuel dump relay altogether.
5. Take out the spark plugs and disconnect the wires for each spark plug.
6. Put the engine compression gauge into the first cylinder's spark plug hole (this is the hole that is nearest to the drive belt).
7. Ask a helper to start the engine. Five revolutions of the engine is enough.
8. Get a not pad or something to write down your results.
9. Do the test for all Cylinders.
10. Compare the average % of difference in your number values If they are not roughly all the same something is wrong.
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