Quote:
Originally Posted by Elemental
Check the compression gauge after cranking. Write down the number. Install old/Replacement spark plug. Repeat for all cylinders.
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Please take this as clarification (Not arguing)
The compression test should be done with all spark plugs removed and accelerator flat to the floor. You should try and make sure that it turns over at roughly the same rate for each test. If the battery is starting to die and each check is getting slower, the test will not be worth much.
But the vacuum gauge will give more useful information than a compression test.
