How to check a car coil

Ignition coil - output test - secondary voltage

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Product Features:. This device is usomh advanced technology from Germany, without touching electricity circuits, the sensor can collect and analyze signals , and diagnostic results can be showed through LED lights and Beeper. Easy to check if there is faults of the automotive electric components.

Automotive Engine Ignition Coil Testing Repair

Testing range:. Coil traditional coil, double spark coil, dingle spark coil , electric generator, inside fan motor, combination valve heating, water cooling emission controling valve, fuel injector, spark plug, hall sensor, electric relay. Instructions :. The 2 sides has different sensitivity of the top on the detector can test different electric lines.

Hold the detector pen to the coil of the line to get precise testing results.

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You can adjust your Cookie Preferences at the bottom of this page. Cookie Preferences. These precautions are necessary because your engine produces electricity, and it is also better to be safe than sorry! As a first step, remove the wire from the plug.

Bench Testing Your Car's Ignition Coil

Identify the right wire based on instructions from the manual and remove it. Next, remove the spark plug with the help of a spark plug socket. Never attempt to do it with bare hands. After taking out the spark plug, attach the plug wire back. Hold the plug wire using insulated pliers, and allow the bare end of the spark plug to touch a grounded surface. Take help from your partner or someone else, and ask them to start the ignition.

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When the key is turned on, you should see a bright blue spark at the end of the spark plug. One downside with this test is that it is hard to know if the ignition coil is not working so well. In other words, you may see a spark, but it can be feeble.

As non-technicians, it is hard to distinguish whether the spark was bright or feeble. This is why the bench test is a more thorough way of testing your ignition coil.

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This bench test is all about the primary and secondary windings of your car. Before you begin, keep the car manual handy and make a note of the normal reading for each of these two windings. In general, the primary winding will have a reading of 0. Check your manual for the exact values. Now, to check this resistance, attach the ohmmeter to the outside poles of the primary winding.

How To Test an Ignition Coil in a Vehicle? | Car Bibles

For the secondary winding, attach one end to either of the poles and the other end to a central high tension terminal. Then check the values. As you can see, this test is more thorough as it gives the exact state of the ignition coil.

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Ignition coils provide the high voltage needed by the ignition system to fire the spark plugs. Most engines that have a distributor ignition system have a single coil. If you suspect your car has a faulty spark plug, use a multimeter to test it out in 7 straightforward steps. Virtually all vehicles manufactured today use ignition coils to provide the spark for the engine’s spark plugs. Other designs will use one ignition coil for each individual.

Even if the readings are a little off from your manual, replace the ignition coil as these off readings could indicate that it is weak.