Quote:
Originally Posted by Tracktimeplz
remove sparkpluG(as in one at a time) screw tester into hole, turn over 5 revolutions, check, repeat.
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Actually, you should remove all the plugs, then test each cylinder one at a time.
If you test one with three plugs still installed, your starter is going to have to overcome the resistance of all four cylinders - you get a better reading if the engine can turn over freely (spin faster). Leaving the extra plugs in, will also cause the battery to "wear down" quicker (again giving misleading results).