August 24, 2012
Ignition coils send electricity from the distributor into the spark plug to make the car run. Ignition coils are well known for failing after a period of Spark Plug ADD770. Testing them to ensure that they are working is a quick process that can be done in five to 10 minutes.
Testing For Spark
A properly maintained car should operate with a steady range of about 1,000 RPMs. If, while the car is idle, the car's RPMs dip or the check engine light comes on or Interface V119, this is a sign of a misfire. A misfire could mean there is something wrong with either a spark plug or the ignition coil. The ignition coil is the part which plugs into the valve cover on the top of the engine and runs back to the spark plug wires. Dependent on the car, there will be anywhere from four to 12 plug wires. This will all vary on the engine size.
To test whether there is spark, turn off the car and, one by one, test the ignition coil. To test an ignition coil, hold it close to the rim of the Ignition System ADD790 on top of the valve cover. Have someone turn the car to the on position but do not crank it over. If a small spark sends from the coil to the car then it means the ignition is getting a spark. Do this to each coil until one does not send the spark to the rim. The one that does not send out a small spark when turning the car on indicates that no electricity is being sent through it into the spark plug and will indicate a bad ignition coil.
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