TD5 Injector not firing

**Bradtot** · 30th August 2015, 01:53 PM

Hi
I have a strange one.
TD5 manual Disco 2a 148000kms
Changed engine oils and filters yesterday drove 80kms all good.
Left to come home and halfway home its down on Power, pull up at lights and its running on 4 cylinders.
Drove home like this and looked at it this morning thinking it will be oil in harness and ecu.
Cleaned ECU and plugs , very little oil but cleaned anyway.
Plugged in nanocom and read fault codes. Injector 4 peak. so in diagnostics I fired all the injectors one at a time. Injector 4 no click no noise. all the others ok and audible click when fired.
So I removed rocker cover and swaped plug 5 with plug 4 and fired 5..no audible noise. I fired 4 which is now on 5 and all good.
So I suspect I have a dud number 4 injector.
Out with the multimeter and it reads about 1.9 ohms I check all the injectors and they all read roughly the same.
So there is nothing wrong with the loom or the wiring or the plugs or the ecu its seems that number 4 injector is mechnically not triggering inside even though I have the coil windings measureing ok.
Anyone had this?
Can the injector be repaired?
Suggestions please.
Brad

**stevo** · 30th August 2015, 02:11 PM

the actual injector solenoid valve could be seized so the coil cannot pull it in and why no click noise heard

**dswatts** · 30th August 2015, 03:51 PM

Brad,
I have a spare set of green top injectors if you need one.

Dylan

**Wenier** · 30th August 2015, 06:34 PM

I could understand an injector seizing up in one of these setups. You have to remember that the click isn't making the injector fire it is actually blocking the bypass path of the fuel and then once the fuel gets to the required pressure it overcomes a spring in the nozzle and fires the fuel out.

With the high pressures it could be plausible to have a solenoid fail in my mind.

**woko** · 30th August 2015, 07:25 PM

There are not many diesel shops that can repair them. I know Lismore diesel can do it when i got a quote from them it was $550. I didn't get mine rebuilt. The harness was the cause. So can't comment on on the business. They were quick on the email reply for the quote.

Sent from my GT-I9295 using AULRO mobile app

**Bradtot** · 31st August 2015, 08:57 PM

Hi Dylan
Thanks for the offer.
I contacted discovery Autos today and they will give me one and loan me the tool to fit it so I should be ok.
I wont be able to get to it until the weekend so will post back when done.
They say that they have seen this before and yet when I did some searching I really couldnt find much reference to td5 injectors not actually firing, or no clicking etc
Once again thankyou and for all the other posters.
Brad

**Pedro_The_Swift** · 1st September 2015, 07:47 AM

That is rare Brad, though I'm not a diesel guy but I read a bit

and I cant recall an injector failing like that. not many kays at all either

**Blknight.aus** · 1st September 2015, 07:47 AM

It can be the pins on the injector not making contact witb the harness but making contact with your meter pins...

Id suggest giving the manual wire wrap and probes method a go amd see what you get happe ing.

**Bradtot** · 1st September 2015, 08:21 AM

Originally Posted by Blknight.aus

It can be the pins on the injector not making contact witb the harness but making contact with your meter pins...

Id suggest giving the manual wire wrap and probes method a go amd see what you get happe ing.

Hi Dave
I find it unusual for 2 plugs not to work on the same injector. I did try and push and hold the injector plug at different angles while testing and measuring thinking it may be the pins but still no worky.
Just so you know I am an electronics tech who fixes wide format digital printers and CNC machines that cut out kitchen cabinets etc, so fault finding is what I do all day long.

Thankyou all once again
Brad

**Blknight.aus** · 1st September 2015, 10:51 AM

not doubting your qualifications or abilities but I've got a heap of quals and still get caught out by the blindingly obvious simple stuff like trying to bleed and start a diesel when the fuel stops been pulled..

or trying to work out why I cant get battery voltage when I forget that the vehicle Im working on has a positive side master switch (which is off but is installed 90 degrees rotated to a normal switch due to panel interference and therefore looks like its on) but can see volts from the positive terminal to vehicle earth.

I think the best one this year was trying to work out why I couldnt power up a tricon cooler. Unplug the unit end and I had contiunity on the unit, I'd only just certified the cable so I knew it was good, plug it back into the unit and unplug the power side and I ad continutiy on the cable and volts at the power supply, what I didnt have was the right cable. I was pluggin in and unpluging the unit adjacent to the one i was ment to be testing, the power cord for the one I ws testing was neatly coiled up between the 2.

From memory, the pins on the td5 injector wont make unless the plug is on square, My usual test for them is to wire wrap the pins, connect them to a set of probes and probe the sockets for trigger voltage after confirming continuity with the injector to the meter

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