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Injector Testing With Secondary Probe

  • Noah
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5 years 3 months ago - 5 years 3 months ago #41345 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe
Always something to learn, but we're in the right place for that :)

You won't be putting your scope in any danger, go for it!

Andy has had success with an alligator clamp on the fuel injector body. As long as you're using the scope you're ahead of most.
"Ground cannot be checked with a 10mm socket"
Last edit: 5 years 3 months ago by Noah.

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5 years 3 months ago #41534 by al514
Replied by al514 on topic Injector Testing With Secondary Probe
So only 2v scale, what's that yellow trace hitting for voltage reading in the 2nd picture down? And sorry for all the questions, it's like I can't stop wanting to learn more, considering I hated highschool lol

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5 years 3 months ago #41553 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe
Ask away, I'll answer whatever I can and defer to the experts for whatever I can't.

Not sure what the voltage peaked at. It's a 50v scale and it's off the screen so it's more than 50v
"Ground cannot be checked with a 10mm socket"

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5 years 2 months ago #42338 by al514
Replied by al514 on topic Injector Testing With Secondary Probe
Hey Noah, I may have asked already but do you know the resistance of pickup coil you used? I have a coil that might work, it's about 550 ohms. Or does it not matter, this coil I have has a ton of windings too, not sure if that changes anything.

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5 years 2 months ago #42339 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe
About 400 ohms.

Honestly, I never gave it thought.
"Ground cannot be checked with a 10mm socket"

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5 years 2 months ago #42353 by al514
Replied by al514 on topic Injector Testing With Secondary Probe
How do I wire up the coil, do both leads get hooked up to the coil or one to the coil and one to ground?

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5 years 2 months ago #42362 by Tyler
Replied by Tyler on topic Injector Testing With Secondary Probe
I dunno how Noah wired his? I had one lead going to each wire off the coil. I connect one lead to a lab scope channel, and the other to scope ground.
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5 years 2 months ago #42364 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe
Same. One lead to the scope, one lead to ground.
"Ground cannot be checked with a 10mm socket"

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5 years 2 months ago #42420 by al514
Replied by al514 on topic Injector Testing With Secondary Probe
Without your scope grounded at all? What about running the 2 scope leads to the coil, then an additional wire going to ground somewhere? So you would have 3 wires. Isn't that how most leads are set up?

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5 years 2 months ago - 5 years 2 months ago #42425 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe
I think when I used it I grounded the scope out of caution, but I don't recall it having any noticable effect on the trace.

Maybe that's why I'm not very invested in secondary ignition testing, lol.
"Ground cannot be checked with a 10mm socket"
Last edit: 5 years 2 months ago by Noah.

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5 years 2 months ago #42430 by Tyler
Replied by Tyler on topic Injector Testing With Secondary Probe

al514 wrote: Without your scope grounded at all? What about running the 2 scope leads to the coil, then an additional wire going to ground somewhere? So you would have 3 wires. Isn't that how most leads are set up?


Many probes are set up that way, in case there's a secondary voltage leak and a spark hits the probe. With the third wire to ground, hopefully the secondary voltage will go to the vehicle and not your scope. :silly:

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5 years 2 months ago #42434 by al514
Replied by al514 on topic Injector Testing With Secondary Probe
That's what I'm worried about, especially with diy probes. Maybe I'll throw a 20x on just in case on the first try.

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5 years 2 months ago #42435 by Tyler
Replied by Tyler on topic Injector Testing With Secondary Probe
In my experience, most arcing happens in and around plug wires (rubbed through, open wire, moisture). Genuine COP's will rarely arc to the top of the ignition coil, where you'd have the probe laying for testing. They might arc around the coil tip to the plug tube, but it won't reach the probe, and you'll see that on the secondary trace. ;)

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5 years 2 months ago #42466 by al514
Replied by al514 on topic Injector Testing With Secondary Probe
My diy probe worked awesome bud, I could see the injectors and ign coils perfectly. Thanks for the advice, I saved a ton of money building my own tools.
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5 years 2 months ago #42476 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe

al514 wrote: My diy probe worked awesome bud, I could see the injectors and ign coils perfectly. Thanks for the advice, I saved a ton of money building my own tools.


That's what it's about brother! Good work ;)
"Ground cannot be checked with a 10mm socket"

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