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How do you tell a good spark from a bad spark when testing the ignition coil wire to see if there is spark?
Wiki User
∙ 9y ago
There is actually a tool called a spark gap tester that you can set the correct gap and see if it will jump the ap. Also there is another tool that is a light that you put in line with the coil wire and see how bright the light is. Without either of those tools, you will need to use a screwdriver and your judgment The spark is supposed to be 30,000 or more volts(I am not kidding), so it will be a good healthy spark that should be able to jump an 8th of an inch or more. If it is a puny little spark that looks more like a static electricity discharge, it is too weak. If you touch it, it should light you up really good. It wont hurt you if you do, because even though it is tens of thousands of volts, it is at such a low amperage, that it doesn't have any punch. You will just know you have grabbed something that you shouldn't have. I tell you this because I know of guys that have used that method to tell how stron the spark is. Anyway, use a screwdriver against a ground, and see how far the spark jumps.
Wiki User
∙ 9y ago
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What color is the spark if the ignition coil is good?
The spark is always blue. If your coil is bad your engine will misfire.
How do you test the ignition coil on your 1994 Geo Metro?
Disconnect the distributor cap end of the coil wire and attach to an ignition tester. Attach the ignition tester to a good ground, away from any fuel lines. A good spark tester can be made from an old spark plug gapped to 0.200". Crank the engine and observe the tester for spark. If a crisp blue spark is noticed, the ignition coil is working properly. If a pale yellow spark, or no spark, is noticed, the coil is more than likely bad.
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One ignition Coil does not spark on 2002 Mitsubishi lancer?
I had similar problem...Ensure that when you replace the Ignition Coil, you also replace the spark plug (might as well do all 4) and the wires. This will prevent further Coil problems. The Coil could blow the plug or wires and when you replace the coil, the plug /wires will blow out the coil again. Also get a full diagnostic...specifically check to ensure the Head Gasket Cover is still good.
Do you have to grease your new spark plug wires?
You do not have to but it will be very good if you place a die-electric grease on points where ignition wires contact spark plugs and distributor/coil pack.
