In order to test the spark, pull the spark plug from the engine, and then start the car. There should be a bright blue spark between the electrodes every time the cylinder fires, provided that there is enough voltage reaching the spark plug. The coil is likely to be faulty if there is no spark.Know More
A digital multimeter is required for testing the resistance levels of the ignition coil. The terminals of the coil are going to be marked "negative" and "positive," and these are the two points where the resistance of primary winding can be measured.
Step 1: Prepare the multimeter
To check a 12 volt coil, set the multimeter to at least a 200 Ohms setting. Attach both leads of the meter to the coil-terminals with black to the negative terminal and red to the positive one.
Step 2: Test the resistance
The normal, acceptable range for a standard 12-volt car is 1.5 to 1.7 Ohms. See if the reading is within this range.
Step 3: Test the secondary coil resistance
Set the meter to 20K Ohm setting, and attach the leads to the ignition coil's center terminal. The reading for secondary-coil resistance should be 11, because if it is lower, that's the reason why sparks are not appearing.Learn more about Car Parts & Maintenance
Parts and tools needed for a car's tune-up include spark plugs, a fuel filter, a socket wrench, a spark plug socket, a spark plug gapping tool, the service manual, screwdrivers, crescent wrenches, a distributor cap, spark plug wires, an air filter, an oil filter, engine oil, a PCV valve, various engine fluids and replacement drive belts. Depending on the brands, tune-up parts cost between $50 and $100, not including tools.Full Answer >
A spark plug is a device that produces an electrical spark, which ignites the mixture of fuel and air in the engine's combustion chambers. A spark plug initiates the combustion in the internal combustion engine.Full Answer >
A coil pack, also referred to as an ignition coil, is a component in the car's engine that changes current generated by the battery into a high-voltage current used by spark plugs. A typical coil pack transforms the 12 volts generated by the battery to the required voltage.Full Answer >
A crankshaft sensor has two purposes: to help a vehicle's ignition system produce a spark and to signal the fuel system to inject gasoline into the engine's cylinders. Without the crankshaft sensor, the engine cannot continue to run.Full Answer >