Disco 2 Discovery 2 TD5 Misfiring and smoking

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V31MAJ

Member
Posts
17
Hi, I'm really stuck on what to do next on my Discovery 2 TD5

it developed a problem the other month, where it was smoking (Black Smoke) like mad and misfiring and not idling, but as soon as you went over 2k revs it was fine, but you had to sit there revving it to keep it going. so I changed the following

- Injector loom
- all 5 injectors
- done the mod from this site https://www.landyzone.co.uk/land-rover/td5-misfiring-and-cutting-out-problem-finally-solved.125039/
- check the ECU for oil but none in there,
- change the ECU for a known working one as a test
- new fuel filter

after all of the above it was working lovely for a month, but now the same problem has come back.

I have had all 5 injectors back out and put through a ultrasonic cleaner, but it hasn't sort the issue

Nanocom is throwing these faults only.

FAULT 28-01 injector 1 peak charge short (CURRENT)
FAULT 28-02 injector 2 peak charge short (CURRENT)
FAULT 28-03 injector 3 peak charge short (CURRENT)
FAULT 28-04 injector 4 peak charge short (CURRENT)
FAULT 28-05 injector 5 peak charge short (CURRENT)

If anyone can give me advice on what to check next that would be great, I have removed the fuel lifter pump to give the filter a clean on the pump a clean, just incase its blocked
 
V31MAJ said:
I changed the following

- Injector loom
- all 5 injectors
- check the ECU for oil but none in there,
- change the ECU for a known working one as a test
Click to expand...
V31MAJ said:
Nanocom is throwing these faults only.

FAULT 28-01 injector 1 peak charge short (CURRENT)
FAULT 28-02 injector 2 peak charge short (CURRENT)
FAULT 28-03 injector 3 peak charge short (CURRENT)
FAULT 28-04 injector 4 peak charge short (CURRENT)
FAULT 28-05 injector 5 peak charge short (CURRENT) ....
Click to expand...
Hi, do you get those codes after the injector loom and injectors were replaced and the same with both ECUs?
V31MAJ said:
- done the mod from this site https://www.landyzone.co.uk/land-rover/td5-misfiring-and-cutting-out-problem-finally-solved.125039/
Click to expand...
- what mod did you do? as there are no visible pictures in that thread
 
Hi, do you get those codes after the injector loom and injectors were replaced and the same with both ECUs?
Click to expand...
Hi bud,
after doing all the above replacement there was no codes as it was running great, but now the problem has come back the only codes I'm getting are those

- what mod did you do? as there are no visible pictures in that thread
Click to expand...
Scroll down the thread and the mod will come up but basically its redoing the wiring for the injectors just in case the loom has split.
 
V31MAJ said:
after doing all the above replacement there was no codes as it was running great, but now the problem has come back the only codes I'm getting are those
Click to expand...
It'e very important to clarify the evolution of your work, so you did all those things(ECU included) and it ran well with the replacement ECU which is still on the vehicle or you put bak the old ECU and the fault came back with that or how?

as long as the injector loom, the engine harness and injectors were 100% ruled out the only suspect which can throw such codes is the ECU... unless there is some power box connected to it
 
Last edited:
sierrafery said:
It'e very important to clarify the evolution of your work, so you did all those things(ECU included) and it ran well with the replacement ECU which is still on tge vehicle or you put bak the old ECU and the fault came back with that or how?

as long as the injector loom, the engine harness and injectors were 100% ruled out the only susect which can throw such cod4s is the ECU... unless there is some power box connected to it
Click to expand...

Hi, as stated in the original post it ran lovely for a month after all that was changed, I'm using the old ECU, but have swapped the ECU's again to clarify it isn't that, the fault codes come up no matter what, I have also tested both ECU's on a friends TD5 and they both work perfectly.
 
Have you changed or cleaned the MAP/IAT sensor?
Have you unplugged the MAF just to rule it out?
Have you checked all inlet/turbo pipes to make sure they aren't delaminating and therefore blocking the inlet flow until for some reason running faster sucks them out of the way?
Black smoke implies it is overfuelling at low revs.


But @sierrafery is the bloke for all things electrical.
Best of luck mate!
 
then IMO you should replace the whole engine harness cos even though you rewired the injector's circuits there can be a bad contact within the head connector or red plug... aamof if the injector loom was a cheap aftermarket that one can be suspect as well... i've seen such aftermarket looms which failed starting from 2 weeks up to 3 months others lasted years, it's a pure lottery, only a genuine LR loom can rule out 100% that fault
 
sierrafery said:
then IMO you should replace the whole engine harness cos even though you rewired the injector's circuits there can be a bad contact within the head connector or red plug... aamof if the injector loom was a cheap aftermarket that one can be suspect as well... i've seen such aftermarket looms which failed starting from 2 weeks up to 3 months others lasted years, it's a pure lottery, only a genuine LR loom can rule out 100%
Click to expand...

So maybe an idea to buy another injector loom again?

or redo the rewire, I did put new pins in the plugs as I have the tool

is there anything else that might throw that code?
 
If it ran well for a while after you rewired it and the injector loom is aftermarket i'd put a genuine injector loom as first move to rule it out. Normally these codes have to do only with the injectors and the wiring between them and ECU or ECU
 
sierrafery said:
If it ran well for a while after you rewired it and the injector loom is aftermarket i'd put a genuine injector loom as first move to rule it out. Normally these codes have to do only with the injectors and the wiring between them and ECU or ECU
Click to expand...
I just spoke with the people who sent the loom and they have said they've never had a faulty one come back but will send me a replacement straight away, so once that has arrived I will update you on the results fingers crossed it sorts it and its here before the weekend
 
Stanleysteamer said:
Have you changed or cleaned the MAP/IAT sensor?
Have you unplugged the MAF just to rule it out?
Have you checked all inlet/turbo pipes to make sure they aren't delaminating and therefore blocking the inlet flow until for some reason running faster sucks them out of the way?
Black smoke implies it is overfuelling at low revs.


But @sierrafery is the bloke for all things electrical.
Best of luck mate!
Click to expand...
Hi mate,

Yes checked all the above, this is why I'm so puzzled. but hopefully @sierrafery will advise me well on the issue, if I can get someone to do a video when I'm starting/revving it to keep it going I will post it up.
 
sierrafery said:
If it's a cheap one it can be from a bad batch, as i said that loom can't be ruled out 100% only with genuine
Click to expand...
If the replacement one works then I will order a OEM version, as god knows how long the aftermarket one will last again and I can't keep going round in circles, but trying not to spend more currently due to finances being low, so replacement through warranty is my option currently
 
V31MAJ said:
If the replacement one works then I will order a OEM version, as god knows how long the aftermarket one will last again and I can't keep going round in circles, but trying not to spend more currently due to finances being low, so replacement through warranty is my option currently
Click to expand...
Ok, souds like a plan... just don't order OEM cos it's just a branded and a bit more expensive aftermarket as well, if you'll be sure that the loom is the problem better bite the bullet and get a genuine LR which means that the part number has the LR suffix not G.
 
sierrafery said:
Ok, souds like a plan... just don't order OEM cos it's just a branded and a bit more expensive aftermarket as well, if you'll be sure that the loom is the problem better bite the bullet and get a genuine LR which means that the part number has the LR suffix not G.
Click to expand...
Replacement loom fitted and no difference!
 
sierrafery said:
That's realy strange... do you still get the same fault codes? also how are the injector balance readings?
Click to expand...
Yep exactly the same codes, how do I check the balance readings on nanocom? As it won’t stay running unless I keep it at 1500rpm
 
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