How to measure SPARK PLUG WITH MULTIMETER

Measuring a spark plug with a multimeter ensures that the spark plug is in good condition to be installed in the engine.
An engine spark plug can be measured with a digital multimeter in a few minutes, we must measure the resistance presented by the central electrode that receives the high voltage on one side and on the other end the spark that ignites the gases inside the chamber is generated. engine combustion.
The resistance measurement of the electrode is done with a scale of 20 KILO OHMS, preferably, regardless of the polarity of the multimeter tips, we measure between the electrode nut and the other end of the electrode (where the spark jumps), the resistance value must be between 3 and 5 KILO OHMS.
A resistance value of the central electrode of the spark plug outside the range of 3 to 5 kilo ohms indicates a faulty spark plug and should definitely be changed.
The second resistance measurement on the spark plug is the measurement of the insulation resistance between the body of the spark plug and the center electrode.
The insulation resistance of the spark plug must mark an OPEN CIRCUIT, for this we measure between the spark plug body in the hexagonal nut and either of the two ends of the central electrode, the value for a spark plug in good condition is open circuit, any value is This is an indication of a damaged spark plug and should be replaced immediately.
All engine spark plugs should be subjected to the above resistance measurement procedure to ensure there are no problems with the other spark plugs.