Can bad points cause no spark?
Can bad points cause no spark?
If no spark, remove the wire from the points and manually “spark” it to ground. If spark, then problem is bad points or condensor. If no spark, then the problem is coil or the wire to the points. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
What causes a coil to have no spark?
If you saw a spark then you have a problem with either the supply of power to the coil or the trigger mechanism (module) in the HEI unit. If you saw no spark you probably have a bad coil. Check you HEI unit’s manufacturer to see whether they require a coil with internal or external resistance and act accordingly.
What to do if your ignition coil is not working?
Older ignition systems used breaker points to interrupt the circuit, while more modern systems “sense” the need for spark by means of a hall-effect switch or crankshaft position sensor. The ignition module uses the information to time spark generation. Test these components if the energized coil fails to function.
How do you test a coil for spark?
If you have 12V at the coil with the key “ON” you have other issues. An easy way to test a coil for spark is to disconnect the + AND – wires, insert a spark plug wire with an extra spark plug in it to the coil tower (to use as a tester) place the spark plug on a good ground.
Can a resistor resistance wire lose its resistance?
The resistance wire can not “lose” its resistance. If you have 12V at the coil with the key “ON” you have other issues. An easy way to test a coil for spark is to disconnect the + AND – wires, insert a spark plug wire with an extra spark plug in it to the coil tower (to use as a tester) place the spark plug on a good ground.
What to do if there is no spark at the ignition coil?
Check for voltage output at the ignition coil. Disconnect the ignition coil wire from the distributor and install the spark tester to the wire and ground the tester to the engine. Crank the engine for a few seconds. If there’s spark, the problem is with the distributor cap or rotor.
Why is there no spark at the coil axle?
If there’s no voltage, check the wire between the ignition switch and the coil and, if necessary, the switch itself. If there’s voltage, the problem may be with the pickup unit. If the pickup is good, then the problem may be with the ignition control module.
What happens when you replace the coil wire on an engine?
You can replace the secondary coil wire on an engine that uses one with an equal length of vacuum hose and the engine will start and run. The powerful spark will travel down the hollow hose to the distributor cap, but the engine will stall under any load because of the weakened spark.
What to do when your engine has no spark?
If there’s no spark or the spark is weak, check the resistance of the wire that connects the ignition coil to the distributor cap. Consult the wire resistance specifications in your repair manual.
