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Q:How can I tell which coil is bad on my 2001 nissan pathfinder
A:Hi Joe, glad to help you! Symptoms of a bad ignition coil: An ignition coil that is completely dead will prevent the engine from starting or will stop the engine if the car is running at the time of failure. This is because no current will reach the spark plugs. An ignition coil that is failing will still provide current to the plugs, but it might not be enough for a full spark and the car will run sluggishly. If the current being provided by the coil isn't consistent, the car will run rough. Testing a ignition coil: Disconnect the battery and remove the coil before testing it. The repair manual for your make and model will give you the resistance specifications for your coil. To test the resistance of the primary coil, touch the leads of a multimeter to the smaller poles on the outside of the coil. If the reading matches up with the specs in your repair manual, the primary coil is functioning properly. To check the secondary coil, keep one of the leads attached to the 12-volt pole and attach the other to the big pole in the middle. Compare the results with the specifications in your manual.