How to check spark plugs with a multimeter and what is important to know when replacing them
Hi all! Today I will show and tell you how to check a car’s spark plugs with a regular multimeter. Let's imagine a situation where you drove 30-40 thousand kilometers on spark plugs alone and decided to check them. But how to do that?
Also at the end you will find very useful information on what you need to pay attention to when replacing spark plugs with new ones.
Checking spark plugs with a multimeter
So, let's take multimeter and set it to measure resistance up to 20 kOhm. Then we take the spark plugs one by one and check their resistance between the central electrode and the contact nut.
If the spark plug is working properly, then multimeter should show a value in the range of 2.5-8 kOhm. If it is different, then it is better to replace the spark plug with a new one.
Using this method, we check the internal resistance of the spark plug's built-in resistor.
Useful advice for those who change spark plugs to new ones
If you decide to replace the spark plugs with new ones and bought an unfamiliar manufacturer, then be sure to check the resistance of the spark plugs using the example above.
The fact is that there are special spark plugs with zero internal resistance, made for a specific type of engine.
And if you accidentally put such spark plugs in your engine, then there is a very high probability that the central control controller will burn out. This is exactly what happened in my case.
Result:
Here I checked 5 of the candles found. 2 pieces were with zero resistance. Of course they work, but they don't fit my car.
Watch the video
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