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Injector Testing With Secondary Probe

  • Noah
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12 Oct 2019 08:24 #34194 by Noah
Thanks to Tyler for giving me the idea to build a secondary probe from an old Honda distributer pick up. B)


While playing around with it, I started to figure that it should be able to detect more than just coil firing. So how cool would it be to walk over to a car with a misfire and touch the coil to verify spark, and then use the same tool to touch the injector and verify operation?

At a 2v scale, 20ms time base I seem to get the cleanest captures. Now to compare to the methods we already have to try and dissect the waveform.
I'm trying to determine if mechanical movement can be inferred from the pattern. I think so, but I'm not there yet.
Let me know what you think.
Is it a viable test?
Am I just being stupid?



Too much plus more equals just right.
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12 Oct 2019 08:26 - 12 Oct 2019 08:30 #34195 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe
Here's a capture touching the purge solenoid on my Honda with a voltage trace on the control wire for comparison.


Sorry the forum uploads my pictures sideways and upside-down :(

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12 Oct 2019 09:14 - 12 Oct 2019 09:17 #34197 by Chad
Replied by Chad on topic Injector Testing With Secondary Probe
I believe I can see pintle opening.




"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
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12 Oct 2019 11:39 #34198 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe
That's where I was looking also. Guess I need to find a car with a stuck injector now

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12 Oct 2019 12:20 #34199 by Tyler
Replied by Tyler on topic Injector Testing With Secondary Probe
I was trying to think of a way to 'stick' an injector? :huh: Like, feed it sandblasting media to keep the pintle from closing. I dunno, just speculating! :silly:

The flexible handle for the probe is inspired, sir. I can see that being easy to get in under Escape intakes and such.
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14 Oct 2019 20:59 #34259 by Tutti57
Replied by Tutti57 on topic Injector Testing With Secondary Probe
Awesome!
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17 Oct 2019 15:11 #34348 by Noah
Replied by Noah on topic Injector Testing With Secondary Probe
Here's another one I had a chance to hook up to today.
2006 Cadillac CTS 4.6l
It looks like when the downward slope of the blue trace begins to climb is when the pintle hump is visible in the current ramp.

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17 Oct 2019 15:16 #34349 by Noah
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28 Oct 2019 13:12 #34609 by FrugalPrepper
Replied by FrugalPrepper on topic Injector Testing With Secondary Probe
I am wanting to test with a stuck injector as well. I am trying to get these wave forms down. I was considering a trip to the salvage yard for an injector and then a syringe with some Harbor Freight Epoxy. I think I will be picking up a Honda distributor pickup as well now!
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