Why does my CDI have a weak spark?
Voltage to the white and blue wire from the cdi to the coil is only getting around 2 volts while cranking. Any idea what is causing the weak spark. This thing is about to make me pull my hair out.
What causes a no spark condition open loop?
If after unplugging the 4-plug connector there is no spark or the spark still looks weak, this tells you that the problem is in the major ignition components like the stator, coils, cdi, spark plugs, spark plug wires, possibly a short in the wiring harness, a bad trigger coil or on EFI models your Injector Coils are bad (they measure 19-20ohms).
How to diagnose no spark or weak spark?
Diagnosing no spark, weak spark or intermittent spark issues First is separating the issue between switches or the primary ignition components like the stator, cdi, coils, trigger coil or possibly plugs or plug wires or plug caps.
How can you tell if your ignition system is weak?
If you remove the secondary lead from an oil-filled coil and it is wet, the coil needs to be replaced. The proper method to check for spark is with a spark tester. It resembles a spark plug but has a sunken center electrode that simulates a load on the coil. Holding the plug wire and seeing if a spark jumps to ground is inconclusive.
How does the stator work on a CDI?
FYI the stator is made up of several coils. One coil is the trigger coil. The second coil is a charge coil which makes electricity to make the CDI box fire. The third coil is the coil unit which charges the battery and powers the lights. 1) If it is a 1 wire coil, it needs to be grounded to the frame to fire the spark plug.
Voltage to the white and blue wire from the cdi to the coil is only getting around 2 volts while cranking. Any idea what is causing the weak spark. This thing is about to make me pull my hair out.
How to test the spark plug on a stator?
1) If it is a 1 wire coil, it needs to be grounded to the frame to fire the spark plug. 2) If it is a 2 wire coil and it fires when not grounded to the frame, the coil is defective. 3) We do NOT count the large wire going to the spark plug. This wire is called high tension. 4) With these steps complete, we can now test the ohms from the stator. a.
If after unplugging the 4-plug connector there is no spark or the spark still looks weak, this tells you that the problem is in the major ignition components like the stator, coils, cdi, spark plugs, spark plug wires, possibly a short in the wiring harness, a bad trigger coil or on EFI models your Injector Coils are bad (they measure 19-20ohms).
What happens when a CDI box goes bad?
Sometimes, a bad CDI does not cause sparks at all. Again, when a CDI box is about to go bad, it can lead to misfires, issues with starting, rough running or even stall the motor.
What happens when you run 12 volts on a CDI?
Running 12 volts to the coil will usually result in burning up the CDI unit or the coil.
Is it safe to test a CDI unit?
It’s a black with yellow tracer wire. Summing up, as a result, if everything looks fine so far and you checked the ignition coil, the power source coil, the pick up coils, the ignition switch and kill switch and the neutral switch, then I think it’s safe to move on to the real CDI unit test.
Sometimes, a bad CDI does not cause sparks at all. Again, when a CDI box is about to go bad, it can lead to misfires, issues with starting, rough running or even stall the motor.
Running 12 volts to the coil will usually result in burning up the CDI unit or the coil.