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[dieseldean]

2.5td with eml light on.
drives like its being starved of fuel, but kicking out grey smoke rich in the smell of dirty unburnt diesel.
paperclip test is now showing;
17 fuel temperature voltage high
41 boost pressure voltage low
43 invalid boost pressure
81 sensor injection start short or open circuit
92 cruise control device circuit open or voltage high

92 always shows as no fitted with cruise control indicator stalk anyway

81 is my main concern as it shown a couple of days ago and the other numbers have only appeared today when looking under bonnet to find what produces code 81 and how to put it right.
is my fuel pump dying

[Seth]

I had this problem earlier in the year ....

'81' is No.4 injector at fault - or, if you're very lucky, it's associated wiring/connector, which is easier to access by removing the inlet manifold. This injector incorporates a 'start of injection' sensor.

Very carefully check the wiring and connector first, but in my case it was the injector at fault - at a cost of around 300 quid from memory.

The symptoms were exactly the same as you describe - it felt as though it permanently had two 'tractors' in tow ..... !

[Omegatoy]

first thing i would change is the pipe from i9nlet manifold to boost sensor it sounds like its split which wuld give most of these faults as the pump would still be throwing the fuel in!!

[Seth]

Where exactly is this pipe located?
Is it one of the two small-bore pipes on the underside of the manifold?
Boost sensor? ..... where is this located?
Cheers, as I'll also take a look at mine.

[Omegatoy]

YEP ONE of them goes to boost sensor up on inner wing and other goes to.......................................................................................................................................................  AHEM tapping fingers while the brain is on a go slow and i cant remember!!! doh :-/

[Seth]

Is this the gubbins with a glass-topped filter thingy? ...... as I've been wondering what this unit actually is.

[Omegatoy]

Is this the gubbins with a glass-topped filter thingy? ...... as I've been wondering what this unit actually is.

nope thats the breather i believe? the bboost sensor has a wiring connection on one end and the vac pipe goes to the other end

[dieseldean]

only things left to check much to my fear of a huge cost is the injectors and pump. slack off injector pipes whilst engine is running and air bubbles come out with the fuel. have replaced filter housing and the sender unit and pump in fuel tank and blown compressed air through fuel lines to clear them.
only getting two codes now 81 sensor injection start short or open circuit. 92 cruise control device circuit open or voltage high
next step is to remove injectors and have them checked.

[TheBoy]

the 81 - check wiring on that injector no 4 - wiring probably damaged. Repair as best you can

[Seth]

Yep Dean - got to agree with TheBoy.

I'm pretty sure that your problem is the No.4 injector and/or it's associated wiring/connector.
Any half decent fuel-injection specialist will quickly confirm/eliminate.
It doesn't sound like your injection pump is at fault - get the tractor to the injection people 'as is' - don't go any further until they confirm.

[TheBoy]

A visual check of wire coming off injector will likely show damage. Just repair it.

[dieseldean]

i,m travelling to work in the tractor at snail pace apart from carboning up the valves and clogging up the cat am i doing any serious damage or is ecu cutting power to prevent damage.

[dieseldean]

where the wire from injector 4 plugs in i get no live feed from either connection but get earth feed from 1 of the 2.
looks like i start bigger investigation of wiring tommorrow.
the fact that when i crack off the feed to any of 6 injectors i get bubbles instead os neat fuel puts fear in me about state of pump

[Seth]

Dean,
I still reckon on that No.4 injector/associated wiring being the culprit.

Although you say that you've got aerated fuel from the injector pipes when slackened, it's likely that the dreaded code 64 would have been thrown if the injection pump is at fault.
Code 81 still points to a 'start of injection' sensor fault, (ie No.4 injector etc.), as above.  

[dieseldean]

can't get a live from plug that injector 4 is plugged into, but get an earth from 1 of 2 terminals. tommorrow will have to investigate where it is fed from. the plastic box where they meet and the glow plugs are fed from is an awkward place to get to. so will replace glow plugs while i'm at it and will have less chance of needing to access it again once (eventually) it's cured