Misfiring in cold

[drosa]

Hi,

This is my fist time posting here and i'd like to thank you for all the info provided in this forum. I'm from Portugal so, sorry my english..

1- Here's my problem,

I have a 1999 Def 90 Td5 with 305.000km runned by me since new and i've never had any engine issue until now.
In fact, my 90 started to misfire (intermitent loss off power) about two months ago in low revs and JUST or MAINLY in cold (first start of the day or after been stoped for a few hours) witch it tend to disapear after a few minutes runing. In hot, the issue is almost imperceptible... It starts well but some times (rarelly) i think it takes a bit longer but i can't swear about this.

I've checked and cleaned the EGR, drained the diesel filter, cleaned allmost plugs under the bonet and air filter, with no success. There's no difference pluging or unpluging the air sensor between the turbo and the air filter housing too. The recent fuel pressure regulator is ok with no leaks.

I've been reading this forum in order to get a clue to my problem and, in fact, i'm getting there because i DO have oil contamination on my ECU red plug witch i've already cleaned but just there...

I'm aware i'll have to replace the injector loom and maybe the injector O rings and washers but i'm intrigued by the fact of this misfiring happening in cold and not in hot... It should misfiring in both situations correct? Could it be a glow plug related issue too? Or perhaps any other thing not related with this?

Any help on this matter will be very well apreciated.


2- I have a good mechanical knowlege on transmitions, diffs, shafts, suspensions and other stuff but i've never worked on engines and i'm woried in the case of replacing the injector loom, witch i see that's a very easy job, i'd like to replace the injector O rings and washers aswell...i'm not sure if this can be a job for me..

My question is, is there any step by step, tutorial or manual with clear info that could allow me to do the work? By the way, it is a sutch a "dificult" work beyond my knowlege because of the degres etc...?


Many thanks in advance for any help you can provide me on this.

[Blknight.aus]

mate hook in...

doing the injector harness is dead easy

open the bonnet
remove the acoustic covering
unplug the injector harness-body harness plug which is at the front right (viewed from the drivers seat) of the engine on the underside of the head.
remove the rocker cover
remove the reatiners for the injector harness and plugs
push the socket up through the bottom of the head and lift the harness free.

installation of the new harness is those steps reversed swapping the words remove with replace and undo with do up


its that simple and takes all of 20 minutes or so.


its also reccomended to clean the body harness, theres numerous methods suggested on how you go about doing that.

http://www.aulro.com/afvb/good-oil/27131-td5-oil-harness.html

[drosa]

Many thanks Dave for your support but that isn't the point...or my english mistake you...

I have plenty of info about the injector harness and i found it very easy to replace too and i have no doubts for working on that. What i'd like to know is if replacing the injectors O rings and washers is that easy too, witch i dont think so... One time replacing the harness i think it's better remove the injectors too and "renew it". That's the complete injector operation i'd like to do on my td5. If you or someone could provide any link with some kind of tutorial or step by step instructions to do that, it will be well apreciated.

I'd like to know too, what's yours and members opinion about the symptoms i've mentioned on my other post.

Many thanks.

[Pedro_The_Swift]

Great first post drosa;)

How about some pics of a Portugese Land Rover:cool:

[drosa]

Thank you for the wellcome Pedro, by the way Pedro is a Portuguese name equivalent to Peter :cool:

Ok, lets see some pics of my 90 in action, hope you like it. :)

[strangy]

Thank you for the wellcome Pedro, by the way Pedro is a Portuguese name equivalent to Peter :cool:

Ok, lets see some pics of my 90 in action, hope you like it. :)

Very nice mate, what sort of chocks are running?

Cheers

[drosa]

Thank you.

These are a "normal" gas procomp shocks but with 90cm extended, i don't know the model name...

[alien]

Many thanks Dave for your support but that isn't the point...or my english mistake you...

I have plenty of info about the injector harness and i found it very easy to replace too and i have no doubts for working on that. What i'd like to know is if replacing the injectors O rings and washers is that easy too, witch i dont think so... One time replacing the harness i think it's better remove the injectors too and "renew it". That's the complete injector operation i'd like to do on my td5. If you or someone could provide any link with some kind of tutorial or step by step instructions to do that, it will be well apreciated.

I'd like to know too, what's yours and members opinion about the symptoms i've mentioned on my other post.

Many thanks.

Is there oil in your ECU?
If so it could explain the cold only as the oil will move around with heat and vehicle movement.

The injectors can be done with care.
Have a look at this thread ...http://www.aulro.com/afvb/discovery-2/91471-off-comes-d2-td5-headgasket-swap.html?highlight=injector
I've seen posts of large allen keys used to pry the injector out and my local machine shop used a slide hammer on mine.
DON'T lift on the electrical side.

There are wiser people on here but my tips would be....
Back of the adjusters prior to removing the injector rocker shaft (althogh I didn't).
Keep things in order (each injector is coded to the ECU).
Make sure the "O" rings are not twisted when refittted.
Take care when removing the copper washers (good hints in that thread).
When refitting the rockor shaft pull down evenly and slowly.
Each injector is adjusted till it bottoms out and backed off one turn, there are marks to line up for each injector position.

Hope this helps you out,

[drosa]

Hi,

Yes, i do have oil on the ECU red plug...

I hope this operation (replacing injector loom and injectors O rings and washers) solves the case of the misfiring...

Many thanks Alien for the great help and for the thread link, it's a great thread!

I'm only concerned by the fact of not having a torque tool...it's really nedded even having a good feeling?..:):cool:

Thank you all again.

[Panya]

Drosa have you got a Nanocom? Before pulling the injectors why not check to see if the cylinders are out of balance? Taking the rocker cover off to do the harness is so easy, why complicate matters if you don't need to? I'd do the harness, clean the rest of it, put it all back together and see if it goes ok. If you are not using lots of fuel or blowing lots of smoke or running rough I would leave the injectors well enough alone...

[drosa]

Thank you Panya for your point of view.

In fact I'm thinking about it but in the other hand I have some leaks from the front of the engine like camshaft cover gasket, camshaft and crankshaft oil seals and maybe others...each one of these zones are dirty with fresh and dry layers of oil. I've not excess of smoke and I've not any other problems on my Td5 but this engine have passed the 300.000km mark...don't you guys think i should do an "entire" overhaul to it in orther to do another 300 with more confidence avoiding beeing expecting any problem at any moment? Or should I just replace the injector wiring and "whait" for future issues?

As I told on my first post, I don't have any engine and gearbox experience but I do have on the all rest of my 90 mechanic. I'll make a general overhaul to it on the begginig of next year and I'd like to be 100% confident about my car wich means that i should do the cylinder head overhaul... But if i have more opinions acording to Panya point of view i'll think a little more...;)

Let me thank you again for your support.

[Blknight.aus]

no, the misfiring wont be because of your injectors, Alien D2 has linked you to a good thread on the process and has all the tips Id give.

If you havent cleaned the oil from the main body harness and the ECU itself I would suspect that the oil there is causing your issues rather than a fault down at the injectors.

checking the injector orings can be done none invasively.

first off check the oil for diesel content if its got lots of diesel in it or the level is rising then one of the top sealing orings is leaking to identify which one use a dipstick sucker to pull about 500ml of oil out of the sump into a clean bottle and the with the rocker cover off and the engine running pour this oil over the injector bodies the oil that washes away the fastest from the injector/head joint is the one that is leaking, if its really bad you may even notice the flow of diesel.

to check the combustion sealing rings simply fill the tank to the very brim of the filler neck so that the breather port in the neck is under diesel and start the engine, combsution blowby will usually turn up as bubbles in the tank.

Hope that saves you some time and effort.

[drosa]

Nice tips Dave! Thank you very much!

So you think i shoudn't open the engine at this stage if it passes that tests? And the oil leakings? I know that's normal leaking some oil but if you advise me to let it go or just keep an eye on it I'll reconsider my point of view...

[nzlandies]

Ill be watching this thread as it develops

I have a td5 with a pain of a misfire when cold, cold weather as well. hot day seems good as gold. I have done the the harness, checked injector balance, no diesel in oil, head was replaced because of this earlier. I keep coming to air or fuel temperature. I did the ambient temp sensor. I unplugged it first which I thought had cured the problem as it ran nicely but all it did was apparently send the whole system into a default mode. When I put in the new sensor it was back to its old tricks. So am on the sensor path just don't want to throw too much money at finding out which.Temp is still the defining characteristic.

interested to see was cures it.

good luck

[discoveryseries1]

mate hook in...

doing the injector harness is dead easy

open the bonnet
remove the acoustic covering
unplug the injector harness-body harness plug which is at the front right (viewed from the drivers seat) of the engine on the underside of the head.
remove the rocker cover
remove the reatiners for the injector harness and plugs
push the socket up through the bottom of the head and lift the harness free.

installation of the new harness is those steps reversed swapping the words remove with replace and undo with do up


its that simple and takes all of 20 minutes or so.


its also reccomended to clean the body harness, theres numerous methods suggested on how you go about doing that.

http://www.aulro.com/afvb/good-oil/27131-td5-oil-harness.html
i keep hearing about replacing the injector harness, dose this mean cleaning it with alcohal or actualy replacing the loom with a brand new one ? where dose one buy a new loom ? are they dear ? thanks mate.
jeff.

[Jock The Rock]

Gday Drosa

Did you end up doing the harness? Did it fix it?

My brothers Disco has approx. the same milage and has the same problem

Does anyone know how the glow circuit works on a TD5? I was learning the other day about pre glow and after glow on the newer diesels. What are the chances the after glow may be at fault as well?