Diagnosing misfires, especially on coil on plug vehicles can sometimes be tricky.
Now we have a test inside the guided component test on snap on tools that is based on a Ford test from the factory.
It's called a coil current RFI test.
Let's walk through how to do it on this focus.
All right, so as I said, this is inside guided component test on the tools.
So I already have the vehicle loaded before.
So I'm just going to go into previous vehicles, go into my history.
There it is.
And then once I load into the vehicle, we can see all the systems we can test.
And of course that's in the engine for the ignition.
Scroll down to the ignition system here.
And that is a secondary test.
And there's that.
There it is right there.
Coil current RFI test and it says a component test meter or equivalent can be used to examine ignition coil RF noise.
Using a low current amp probe.
Look for RF noise in the ignition current waveform while stressing the ignition system to detect a faulty coil during this test, look at the current waveform microscopically.
Zoom in on the waveform a very high resolution to accomplish this so it's already going to set us up for that.
So it says we need to take our low amp probe connected to the tool already is, it's actually already connected to the vehicle as well.
And then it says clamp the current probe around the battery positive side of the control side, do not clamp around both.
So one or the others, we have it around the power side right here and we need to take the coil out and flip it over, make sure it's not arcing on anything around.
So once it's all set up, we can hit view meter, it's going to set it up for us.
And then I'll have my helper over here start up the vehicle and there we go, there's my pattern, Just move it over there a little bit, let it settle and then we'll hit stop.
All right, we can turn off the car now.
Don't want to leave it running for too long without a coil in the hole.