Thread: Td5 rough at Idle

Revisit the injector harness issue; unplug the ECU plugs and they may still be soaked in oil. It is common for this to occur again after replacing the harness as the oil left in the loom continues to travel down the wires. You may need to clean the ECU plugs again after this time too, and don't forget to check the MAF and AAT sensor plugs at the airbox as I have seen these oily too, causing faults and poor running.

'CO' contact cleaner is your friend


JC

Not being the full bottle on these things, I was always under the impression that once you disconnect the plugs from the ECU you need the landrover computer codes to reset them when plugged back in..Is this not so?..Thanks for the advice.
Cheers Ean

No you can unplug and replug at will!

Originally Posted by Ean Austral

Not being the full bottle on these things, I was always under the impression that once you disconnect the plugs from the ECU you need the landrover computer codes to reset them when plugged back in..Is this not so?..Thanks for the advice.
Cheers Ean

Not necessary unless the injectors themselves have been moved to another pos in the head, IE from number 3 to number 5 cylinder etc, and then it is only required to 'trim' the injector for max efficiency. The resetting of an ECU really only needs to be done when switching from one vehicle to another as each vehicle communicates with the ECU via the rolling code in the immobiliser, and needs to recognise a valid code to enable the engine ECU to 'unlock'. This won't be a problem if you are unplugging, cleaning and refitting your original computer. it can even remain out of the vehicle for days etc and will be fine unless you configure another ECU its place, and then the rolling code gets interupted AFAIR.(Haven't tried this bit, but in theory that is what can happen)

JC

Originally Posted by justinc

it can even remain out of the vehicle for days etc and will be fine unless you configure another ECU its place, and then the rolling code gets interupted AFAIR.(Haven't tried this bit, but in theory that is what can happen)

JC

That doesn't cause an issue either JC in my experience. I have a whole pile of them which I swap around and they all work all the time, once the codes are put in (Security and injectors) once.

(unless I have msiunderstood what you mean!)

Originally Posted by Psimpson7

That doesn't cause an issue either JC in my experience. I have a whole pile of them which I swap around and they all work all the time, once the codes are put in (Security and injectors) once.

(unless I have msiunderstood what you mean!)

Aah, thanks Pete, haven't tried this, so thanks for the info!
In theory, the rolling code should be lost once another gets substituted, but obviously not.
I'll add that to my list of learnt things this week!(And its only Monday)

JC

Ours got a little rough at idle and had the engine mounts changed, all fine now but i can imagine the list of things to cause this could be a mile long

Back 2 the ECU, now that I have had another 1 put into my car and the codes changed from the old 1 to the new 1, I wont have any problems unplugging the ECU connections..Is that right?
Cheers Ean