TD5 Disco Lumpy idle and underpowered

Hi guys a friend of mine has a 1998 disco td5 which just recently developed a poor idle missfire and underpowered when driving.
My carman scan wouldn't connect so i borrowed a friends autodiagnos and got 5 codes 2 were for air conditioning which is not fitted to the car so i'm not including them. The codes found were as follows:
088 EGR Inlet throttle output down
120 Can Error
130 Injector 2 peak charge to short
I have checked the red plug at the ecu for oil and there was none there was also none at the injector harness connector. When the rocker was removed and the loom removed all of the injector plugs were full of oil. So i cleaned all the oil out and tested again with no difference. Also removed inlet egr valve and cleaned and ensured proper operation. Still no different so i checked the resistance of each injector and all seemed to have the same resistance not sure what the exact figure should be but them all being similar made me think they are all ok as she runs fine on 4 cylinders.
So could this be the injector loom is compromised and just hasn't managed to infect other areas of the looms yet.
Also noticed a dampness at the rear of the head and couldn't decide whether it was diesel or oil so gonna check the fuel regulator for leaks tomorrow.
Any thoughts or help greatly appreciated
spoons

plug it in a dedicated tester... IMO those codes are all fake.... though u might check the EGR...if it;s cloged/blocked it could make trouble

sierrafery said:

plug it in a dedicated tester... IMO those codes are all fake.... though u might check the EGR...if it;s cloged/blocked it could make trouble

Click to expand...

Removed the inlet manifold egr valve and cleaned and checked operation valve is definately shut at idle so shouldn't cause this.
I have ordered an injector loom due to the oil ingress at injector plugs and a new pressure regulator and filter/gaskets because the regulator was weeping at the electrical sensor. Hopefully rectifying these probs will make a difference.
I resistance checked the existing injector loom and there were some varying results so i'm gonna do a quick check on the new one tomorrow so i have some comarison data to work with.

After u'll eliminate all other possible source of these symptoms, taking into account that's an old D2 , dont exclude the timing chain/sprocket replacement as an improving factor. See this, and be aware that it's not mandatory that all of these symptoms to be present: Worn Timing Chain Symptoms | eHow.com , and if u are anyway in there it's good to replace the injector washer's and seals too.

thanks for the info the regulator and injector loom arrived last night so i'll give them a whirl and see if i get rid of any codes if that fails then i'll have to check out the timing chain but would that not flag crank sensor problems?

Ok that has made very little difference apart from there is no weeping from the fuel pressure regulator now.
I decided to go deeper on the codes and started doing actuation tests and injector no 2 the one with the code flagged makes considerably less of a click when actuated in comparison to all other injectors.
So i disabled the cylinder balancing and monitored levels and cylinder 2 has a 7% difference to all other cylinders.
Its looking very much like the no 2 injector secondary coil is breaking down and imparing function.
Any ideas

Just borrowed a t4 landrover diagnostic tester (omitec) which i think is exactly the same as a hawkeye before rebranding and the only fault its showing is
Fault 3192 : Injector 2 peak charge short logged.

Same fault with to different testers now and this one is land rover branded!

Does injector 2 peak charge short mean the charge time is to short or that it has detected a short in the circuit?

Did the injector test with this unit and no 2 fires at a considerably lower volume then the rest.

Also i did a resistance check from an injector plug 2 back to red plug of ecu and injector 1 and had the same readings of virtually no resistance so the loom to the ecu is fine.

What now?
Scope ecu output for injector 2 and a comparison injector?
Does anyone have any specs for injector resistance on the coil winding see if i can find a definate prob with injector or ecu before getting any more parts. I seem to have a similar resistance for all injectors at the mo.

Think i may have cracked it now tested the loom at and injector continuity at the ecu plug and found no problems then went to scope the ecu output but my cheapo laptop scope gave up the ghost so i dug the old injector loom out of the bin and extended the wiring so i could swap plugs 1 and 2.
Ran the engine and checked the codes and injector no 1 was now the defective injector so the fault lies with the injector not the ecu or wiring.
Just got to determine what colour injector i need and hopefully should be away!
That chopped loom is gonna become part of my landy tool selection now so if i ever come across another similar fault i can hoepfully diagnose quicker.
Thanks for the help will update after the injector has been changed and coded
Goes to show sometimes on the odd occasion codes are the exact problem!