There are several different symptoms that may surface if a car has a bad ignition coil, including backfiring, trouble starting the vehicle, engine misfires, stalling and poor gas mileage. Any one of these problems, or an aggregation of them, indicates a vehicle that has a dysfunctional ignition coil.Know More
The ignition coil is the part of an automobile that takes power from a generator and transfers it to the spark plugs, igniting the fuel. This makes the vehicle start running and is a necessary part of the ignition process. However, it is possible for an ignition coil to become dysfunctional and cause a wide variety of car problems.
Because ignition coils are so important to the start-up process of a vehicle, they can cause problems when the car is turned on. If a vehicle has trouble starting up, there may be a bad coil. Regular and repeated backfirings are also a signal that a car's ignition coil is beginning to lose its functionality, according to DoItYourself.com. Sometimes a bad ignition coil has an impact on the car's gas mileage, causing it to become less fuel efficient over time. Other problems related to bad ignition coils include regular stalling and coughing, sputtering sounds when a car is started.Learn More
Ignition, fuel and compression are the three primary reasons why a car might crank, but the engine does not turn over and start the vehicle. An engine that does not crank or cranks slowly is pointing at a starter- or battery-related problem.Full Answer >
Tappet noise is a ticking, tapping, clicking or clacking noise that occurs when tappets, also called lifters, hit the top of the engine, and this can cause engine misfires and damage. It is usually heard in the engine half on the passenger's side, or the right side of the car in American cars.Full Answer >
A car can overheat while idling if there is not enough coolant in the radiator or there is a malfunctioning fan, radiator or fan belt. Additionally, some cars have a fan clutch that may cause overheating.Full Answer >
Although there are a number of suggested tests for the ignition coil while it is still attached to a car, the only accurate way of testing a coil is on a bench using a multimeter in the resistance setting. The ignition coil has two coils of wires, called windings. The meter quickly displays if either winding is bad.Full Answer >