Needle injector check - disassembled condition

Hello everyone!

I would like to know if it is possible to inspect a natural gas heating system even when it has been modified or expanded. In the built-in state, I'm familiar with the old "tapping test," but it doesn't help much when the part is lying on the workbench.

Best regards,
glimmer

[Translating...]

Hi,

der NHG geht nicht zuverlässig zu prüfen, außer man fährt mit dem Auto herum. Das Teil kann eine Stunde einwandfrei funktionieren und dann haste doch für ein paar Sekunden keine Funktion.
Fehlerspeicher vom Motorsteuergerät ist die sinnvollste Prüfmöglichkeit.

Edit: Fachartikel zum Nadelhubgeber, https://community.dieselschrauber.org/en/viewtopic.php?t=26339

Grüße, Rainer

That's a shame... I guess I'll have to find a way to install it and try it out. Thank you for the response!

schimme wrote:

That's a shame... then I'll probably have to find a way to install it and try it out. Thank you for the answer!

How about connecting the NHG to the cable, turning on the ignition, and logging into the engine control unit?
This should be sufficient as a preliminary test.

You can also make a resistance test in a simpler way.
"Furthermore, I believe that NHGs are more likely to fail due to mechanical problems than electrical ones."

I performed a resistance test on my faulty NH fuse (error code: short circuit to +) and couldn't detect any difference.
What does a mechanical failure look like in a new car?

Something might be stuck or broken. This is roughly what the inside of the thing looks like.

...or it could simply be an exposed (uninsulated) spot on the cable.

Sure, I also have a question about that.
Does the NHG provide a resistance signal, or is it positive/negative?
I'm asking because I just installed a new one myself.
The Aber of the new generation was a different type of plug adapter, costing 80 euros.
I quickly modified the plug.
Now, I've mixed up the cable connections on my old device, and I'm not sure which cable goes where.
Is there a way to measure that?
The plug indicates +/- for the NHG cables, but unfortunately, both cables are white with no markings.
I would like to keep it as a spare part, since the injector nozzle was still okay after the leak.
Oh, I swapped it out because two nozzles were clogged.
Best regards,

Let me dig that thing out. I unfortunately have the NHG here without the connector housing, and I really didn't want to connect it with the wrong polarity.

How will you distinguish between the two wires?
Both of them are, in fact, the leads of the same coil.
hg
Herbert.

Since it's white, there's nothing visible. Therefore, it seems like it doesn't matter.

marson wrote:

Since they are white, there is none. Therefore, it seems that it doesn't matter?

It shouldn't really matter, but the effort required for a test drive to try it out is manageable, as there are only two possible options.

A test without a car can only be performed using an oscilloscope, a power supply, and a contact device. It probably wouldn't be worth it.