When to replace your ignition coil and how to check it's bad

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When to replace your ignition coil? How to know when it's bad. How to check and replace.

10 signs your ignition coil is failing

Number one. Low power. The function of the ignition coil is to transform battery voltage to high voltage. The high voltage is then transferred from the ignition coil to the spark plug in order to create a strong spark. A failing ignition coil will not give enough power to the spark plug therefore causing weak spark or no spark.

Number two. Flashing check engine light. A flashing check engine light alert the driver that one or more cylinder is misfiring. One of the common cause of a misfire is ignition coil. First, use a scan tool and confirm the cylinder is misfiring. Next, use a test light and check for spark. The engine must be running to perform this test.

Number three. Engine shakes at stop light. a misfire is most noticeable at idle and at a stop light. If the engine shakes and check engine flashes, suspect a faulty ignition coil.

Number four. High mileage. An ignition coil can last anywhere between 60,000 miles to 120,000 miles depending on the quality. If the ignition coil has not been replaced during these intervals. It may be time to replace it.

Number five. Poor gas mileage. A good ignition coil must give adequate power to the spark plug to provide a good strong spark. If the spark plug is still in good condition, replace the ignition coil.

Number six. Fouled ignition coil. An ignition coil can prematurely fail caused engine oil contamination. A bad valve cover and bad spark tube allows engine oil to seep into the spark plug and eventually foul the ignition coil. Valve cover replacement is required and possibly new ignition coil. Sometime wiping the oil off the ignition coil can help.

Number seven. Animal interference. During cold season, rats are known to crawl into the engine bay to stay warm. Rats are known to chew on ignition coil wires, connector, fuel injector wires and anything rats can chew on. Look for rat droppings on the engine bay.

Number eight. Water. Sometime a vehicle has no choice but drive through a flooded road or pothole. When a vehicle drives through it, water can splash into the engine bay and wet the ignition coil therefore preventing the coil from working properly.

Number nine. visual inspection. If you are experiencing lack of power, open the hood and take a look at the ignition coil. Sometime a bad coil can crack from excessive engine heat and ground itself. Spark can be seen jumping from the crack to the nearest ground.

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