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How to Test Spark Plugs

By: JollyBean


  When you think your engine is a bit sluggish, you need to know how to test your vehicle's spark plugs. Before you even plan on going to a mechanic to have your vehicle checked, you can do the spark plug testing yourself.


Instructions


Step
1

Disconnect the spark plug wire on your vehicle's engine while it is still running.

 

Step
2

You will know that nothing is wrong with a spark plug if, upon disconnection, the engine starts running roughly or drops speed.

 

Step
3

If the plug is bad there would be no change in the idle of the engine when that plug wire is removed.

 

Step
4

You can test the ignition of the spark plug by disconnecting it from the wire. Put the spark plug wire's end close to a metal surface and you should hear a crackling noise or see a spark if the spark plug is in good working condition.

 

Step
5

When you crank your engine, check if there are sparks on each of the wires of the spark plugs.

 

Step
6

A spark on each of the wires means means the compression is good, while no sparks mean a wire is not working anymore.

 

Step
7

Keep in mind that all of the spark plug connections need to be securely hooked up.

 

Step
8

Give the spark plugs' link connections a wiggle then start the engine again – the problem may just be as simple as loose wires.

 

Step
9

Make sure that the spark plug's ends are free from dirt, grease or oil deposits – those may be the culprits why the spark plugs are not working well.

 

 

 

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JollyBean

Cars & Motorcycles

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