How can you tell if a coil wire is bad?

How can you tell if a coil wire is bad?

Signs of a Bad Ignition Coil

1. Illuminated Check Engine Light. With most modern vehicles, a faulty ignition coil is enough to turn on the Check Engine Light.
2. Misfiring Engine. If an ignition coil is not working properly, your engine will likely misfire.
3. Hard Starts.
4. Worsening Gas Mileage.
5. Diminished Power.
6. Sudden Backfires.

What does an ignition coil capacitor do?

A Capacitor Discharge Ignition or CDI is an electronic ignition device that stores an electrical charge and then discharges it through an ignition coil in order to produce a powerful spark from the spark plugs in a petrol engine. Here the ignition is provided by the capacitor charge.

How does the ignition coil produce the high voltage spark?

An ignition coil produces a high voltage output on its secondary when the current flowing in the primary winding is interrupted. That energy is then released, generating the high voltage output. Energy is stored in the primary of the coil when current is flowing through it.

How many volts should an ignition coil put out?

Electricity Goes Out The average vehicle ignition coil puts out 20,000 to 30,000 volts, and coils used in racing applications are capable of 50,000 or more volts at a constant rate. This new voltage is then routed to the distributor via the coil wire, which is just like the spark plug wires, only normally much shorter.

How many ohms Should a coil wire be?

Simply attach or hold a meter probe on each end of the cable and read the total resistance on the meter. The Society of Automotive Engineers suggests the maximum resistance should be 12,000 ohms-per-foot. However, some OEMs have recommended different maximum resistances.

How do you test a coil cable?

Bench Test (Coil Wire is Uninstalled)

1. Connect your ohmmeter or multimeter to the primary studs of the coil. When you look at the coil, the primary studs will be sticking out the top and look something like two bolts or poles.
2. Make note of the reading on the ohmmeter.
3. Connect the ohmmeter to the secondary winding.