Hesitation, stumbling, bucking, and stalling may indicate a bad ignition coil. This power gets converted into electricity through electromagnetic induction, which in turn creates a high voltage across the two sets of contacts inside the ignition coil. When you turn on the key, your Jeep 4.0 engine control unit (ECU) delivers power to one set of contacts on the ignition coil. The ignition coil produces a high-voltage electrical current needed for ignition. In addition to the spark plugs, the ignition coil is a part of the engine’s electrical system. What are the bad signs of an ignition coil? If one end looks burned, try reconnecting it to the coil pack with a flexible jumper wire to see if the engine starts (you may need to remove the intake manifold to gain access). Test each wire by removing it and looking at it. The engine cranks but doesn’t start Bad spark plug wires with shorted ends. The most common is bad spark plug wires, which you can check simply by unplugging each one and looking at it.Ĭheck each spark plug wire by removing it and looking for cracks or fraying. The following table shows all the 4.0 bad coil symptoms you are likely to see. The wiring harness delivers the current to each coil pack. The computer regulates the voltage delivered by each cylinder so that all of them fire at exactly the same time, which makes for smoother running and better fuel efficiency than if they were firing in a more irregular pattern. The spark plugs and ignition wires are the only two parts of the engine that are directly related to the firing process. A defective coil pack can lead to a variety of Jeep 4.0 bad coil symptoms, more than any other problem.
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