Several tests can be done to test an electronic ignition coil, including a standard coil test, primary circuit switching test and ignition coil resistance. These tests will test the resistance felt on the ignition coil when it is connected to an outside power source.Continue Reading
To perform a standard ignition coil primary resistance test, the ignition should be off in the car. Once the two low voltage coil terminals are disconnected, the resistance should remain between 0.3 and 1 ohms.
A switching test uses a 12 VDC test lamp. A small straight pin should be inserted into the wire that runs the negative coil to the TFI module. The pin can then be connected to the lamp. If the lamp flashes, more circuit tests need to be performed. If the light simply lights up, a wiring harness test should be performed. If the light does not come on at all, the continuity of the primary circuit should be tested.
Ignition coil resistance tests are used on the secondary aspects of the ignition coil. These tests should be performed with caution because the circuits of the secondary part of the ignition can have very high voltage. These tests should only be performed if there was inconclusive evidence in any of the primary tests.Learn more about Car Parts & Maintenance
Common signs of a failing ignition coil for a Pontiac Grand Am or other vehicle include hard starting, engine misfiring, noisy engine, stalling, backfiring and poor fuel economy. The ignition coil is an integral component of a vehicle's ignition system and responsible for supplying current to spark plugs to ignite the fuel inside the engine's combustion chamber. Malfunctioning ignition coils fail to generate sufficient voltage to fire spark plugs properly.Full Answer >
Symptoms of a bad ignition coil include backfiring, bad fuel economy, and stalling and starting issues. Before the ignition coil is replaced, the engine will need to be properly diagnosed to ensure it is the root of the problem.Full Answer >
Common diagnostic codes for Volvos that cause the Check Engine light to come fully on or blink include emissions-related codes, codes indicating fuel injector malfunction, codes indicating cylinder misfire or knocking, and codes indicating ignition coil or electronic control module malfunction or failure. The most common reason for a check engine light to come on is an unusual reading from the oxygen sensors, and a vehicle will not pass state emissions inspection until the problem is resolved.Full Answer >
An ignition coil is a coil in a car's ignition system that carries the 6 or 12 volts from the battery to the many volts used to spark the spark plugs in the ignition. An ignition coil is also called a spark coil, and is classified as an induction coil. All induction coils are electronic transformers that transform low-voltage pulses from the DC supply into higher voltage currents needed to spark machine engines.Full Answer >