Novice Scope User, Can't get a good amperage waveform from fuel injector

Hi all,

I recently purchased a picoscope 2205A and a Hantek current clam with the intention of diagnosing a problem I have. I have a 99 Chevy Motorhome with a 7.4 with a dead miss on cylinder 6. I'm fairly sure it's a fuel injector, but I wanted to prove it. Unfortunately, the injectors are under the plenum so I had to connect the amp clamp to the control wire at the harness about 10 inches from the injector itself. I was unable to get a good waveform. I got a waveform, but it looked nothing like I would expect.

My question is, when scoping a current waveform on a fuel injector, do you need to be very close to the injector itself? If not, is this just user error/ the nut behind the scope?

Any help would be appreciated.

Post a picture of your waveform and your setup and we can help with how to improve it

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PatrickC wrote: I was unable to get a good waveform. I got a waveform, but it looked nothing like I would expect.

If it's broken it won't look normal. Best to practice on one of the good injectors first. If you've got an attenuator test voltage as well.

With a current clamp it shouldn't matter where it goes on the 12v feed wire check your scope is to work on DC signal