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Injector Testing With Secondary Probe

  • Noah
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12 Oct 2019 07:24 #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?



"Learn, apply, repeat."
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12 Oct 2019 07:26 - 12 Oct 2019 07:30 #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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  • Chad
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12 Oct 2019 08:14 - 12 Oct 2019 08:17 #34197 by Chad
Replied by Chad on topic Injector Testing With Secondary Probe
I believe I can see pintle opening.




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Last edit: 12 Oct 2019 08:17 by Chad.
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12 Oct 2019 10:39 #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 11:20 #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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Today 19:59 #34259 by Tutti57
Replied by Tutti57 on topic Injector Testing With Secondary Probe
Awesome!

Nothing is ever as bad as it seems...
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