Resistance of diesel injectors

[Daveluck]

Anyone know what the resistance of the injectors is in the 2.7 TDI?

Trying to see if I can replicate the test below


https://youtu.be/ZVXchvHefNc

Thanks

Dave

 

[Banshee]

Anyone know what the resistance of the injectors is in the 2.7 TDI?

Trying to see if I can replicate the test below


https://youtu.be/ZVXchvHefNc

Thanks

Dave

100 ohms I think

 

[solarman216]

Anyone know what the resistance of the injectors is in the 2.7 TDI?

Trying to see if I can replicate the test below


https://youtu.be/ZVXchvHefNc

Thanks

Dave

Hi Dave, well first the link you put up is for petrol injectors, different beasts altogether, anyway Banshee is right, locate the No 1 injector wires and unplug the connector, put your meter across the two wires to the injector and you should get around 100 ohms, but this only works for Bosch, (Bosch Maff = Bosh pump and injectors) if you have Zexell you cannot test this way, but if faulty you should have a code, Rick

 

[Daveluck]

100 ohms I think

Cheers Banshee but I'm pretty certain they won't be more than 18ohms!

 

[Banshee]

Cheers Banshee but I'm pretty certain they won't be more than 18ohms!

No mate, def 100 ohms

I did the workshop download :thumb2

 

[solarman216]

No mate, def 100 ohms

I did the workshop download :thumb2

ONLY IF BOSCH, Rick

 

[Daveluck]

Shhheeeeetttttteee 100ohms!

OK live and learn.

I'll never doubt you again banshee:clap

 

[Banshee]

Shhheeeeetttttteee 100ohms!

OK live and learn.

I'll never doubt you again banshee:clap

Hehe cheers mate but Rick is right, only on a Bosch setup, forgot to add that

http://www.nissan4x4ownersclub.com/downloads/workshop/wk50.pdf

 

[Madmark]

My new one read 95ohms

 

[Daveluck]

Hi Dave, well first the link you put up is for petrol injectors, different beasts altogether, anyway Banshee is right, locate the No 1 injector wires and unplug the connector, put your meter across the two wires to the injector and you should get around 100 ohms, but this only works for Bosch, (Bosch Maff = Bosh pump and injectors) if you have Zexell you cannot test this way, but if faulty you should have a code, Rick

Rick, So on my Rover ( Bosch ) the injectors are only 14.5 ohms which is a massive difference but there you go that's why I asked.

Are you saying that the test isn't valid because the test I posted was on petrol injectors and won't work on our diesel injectors?

I don't have a code reader other than torque pro. I quickly plugged that in a few days ago to see if I got anything but didn't check to see if could read the fault codes. I'll run it tomorrow when I have more time.

 

[Banshee]

My new one read 95ohms

Workshop download says 100 ohms, mine was only out by 1 and with the resistance in the wires I put that down as a normal reading.

95 from a new one and I'd have sent it back :nenau

 

[solarman216]

Rick, So on my Rover ( Bosch ) the injectors are only 14.5 ohms which is a massive difference but there you go that's why I asked.

Are you saying that the test isn't valid because the test I posted was on petrol injectors and won't work on our diesel injectors?

I don't have a code reader other than torque pro. I quickly plugged that in a few days ago to see if I got anything but didn't check to see if could read the fault codes. I'll run it tomorrow when I have more time.

Rover = different model = different injectors, you have 100 ohms so that is a valid number for these, in fact anything from around 80 to 110 will be good it is just a coil of fine wire around the injector needle that detects needle movement bearing in mind it only moves a couple of thousands of an inch or so, but the Zexell injectors work on a different principal they use pietzo so will give no reading on ohms, Rick

 

[Banshee]

Rover = different model = different injectors, you have 100 ohms so that is a valid number for these, in fact anything from around 80 to 110 will be good it is just a coil of fine wire around the injector needle that detects needle movement bearing in mind it only moves a couple of thousands of an inch or so, but the Zexell injectors work on a different principal they use pietzo so will give no reading on ohms, Rick

Ah ignore my last post then Mark, do you mean to say that the Zexel ones use Pietzo crystals?

 

[solarman216]

Workshop download says 100 ohms, mine was only out by 1 and with the resistance in the wires I put that down as a normal reading.

95 from a new one and I'd have sent it back :nenau

careful here, how much did you pay for your meter? less than £100 and at 100 ohms it could be out by quite a lot, as said it is a coil of wire, it will read around (and that means what it says) 100 but if injector has failed it will read infinity or zero (ish) which means less than 10 ohms, Rick

 

[solarman216]

Ah ignore my last post then Mark, do you mean to say that the Zexel ones use Pietzo crystals?

Yep and whats more they are replaceable, the electric bit on the side of the injector I mean, Rick

 

[Daveluck]

careful here, how much did you pay for your meter? less than £100 and at 100 ohms it could be out by quite a lot, as said it is a coil of wire, it will read around (and that means what it says) 100 but if injector has failed it will read infinity or zero (ish) which means less than 10 ohms, Rick

My little cheapy meter is calibrated to 0.8% ± each reading for resistance. I can live with that.

Just curious as I have no idea how the injectors work. Is it all or nothing then with no degradation? So if for instance I'm only getting 50 ohms does that mean the injector is failing and would cause over / under fuelling issues.

 

[Banshee]

careful here, how much did you pay for your meter? less than £100 and at 100 ohms it could be out by quite a lot, as said it is a coil of wire, it will read around (and that means what it says) 100 but if injector has failed it will read infinity or zero (ish) which means less than 10 ohms, Rick

It's only a £20 quid multi meter and it read 101, I used the electricians Fluke one from work, had more settings than the bloody washing machine and microwave put together, that also read 101 so I'm glad my meter is OK

 

[solarman216]

My little cheapy meter is calibrated to 0.8% ± each reading for resistance. I can live with that.

Just curious as I have no idea how the injectors work. Is it all or nothing then with no degradation? So if for instance I'm only getting 50 ohms does that mean the injector is failing and would cause over / under fuelling issues.

Ooooohhhhh no no no, diesel injectors on a 2.7 work purely by fuel pressure, the fuel is fed down drill ways to a tapered needle which is held on its seat by a very strong spring, it takes 2000 psi to lift this needle which chatters on its seat as the pressure is released then builds up again, this all happens in micro seconds, so atomising the fuel, as long as it receives clean fuel it can last well over 500K miles and more, what you are talking about is the No 1 injector which sends a signal to the ECU to tell it the precise time the pump is injecting, that is all, Rick