td5 misfire

hi hope someone can help.
a misfire appeared a few days ago now it just about starts.
i changed the fuel filter just in case, no change
so tomorrow i am changing the injector harness and am hoping this might cure it but i am not to hopeful.

any ideas would be appreciated

regards
steve

steve s said:

hi hope someone can help.
a misfire appeared a few days ago now it just about starts.
i changed the fuel filter just in case, no change
so tomorrow i am changing the injector harness and am hoping this might cure it but i am not to hopeful.

any ideas would be appreciated

regards
steve

Click to expand...

Hi Steve, have you checked to if oil is getting through to the ECU?

To do this you need to remove the battery neg lead (ensure you have the radio code!!), remove the black plastic cover, remove the single philips screw holding the ECU in place, remove the jack and then lift out the ECU.

Remove the two plugs and check the red plug for oil - if there is any there stand the ECU on it's end on kitchen towel to allow the oil to drain out.

Clean the oil from the red plug using switch or brake cleaner. when the oil has stopped flowing from the ECU, reinstall and test drive.

Assuming this improves things replace the injector harness but you will probably find that you will need to clean the red plug several times to get rid of any residual oil.

steve s said:

hi hope someone can help.
a misfire appeared a few days ago now it just about starts.
i changed the fuel filter just in case, no change
so tomorrow i am changing the injector harness and am hoping this might cure it but i am not to hopeful.

any ideas would be appreciated

regards
steve

Click to expand...

Hi Steve,

My Disco TD5 (73K miles) was like this until yesterday.

I had all sorts of problems for a while.
First the fuel pump failed so I fitted a new one.

It was still getting sluggish to start, and VERY smoky on start up. I was beginning to blame this on my reclaimed-oil fuel ... but read on.

I took the ECU out and the red plug was full of oil. I cleaned it, and that day only, it started and ran a lot better, but not right. Next day back to smoke and VERY slow to start.

Then as the fuel pressure regulator had been leaking for a while, and the starting problem and SMOKE from the exhaust got really bad, so yesterday afternoon I fitted a new fuel pressure regulator. What a HELLISH job. If someone knows an easy way to do these, I want to hear it.

It made no difference except the fuel leak stopped. So, I then took the cam cover off the engine, and one by one took out the injectors, cleaned the carbon off the tips, scraped them VERY clean especially in the recess around the tip (it fills with burnt carbon), filled the recess with blue Hylomar, cleaned the seat in the head ABSOLUTELY clean, and in about under 2 hours had all five injectors fitted with new washers and O-rings. Before fitting the O-rings I greased the groove for the O-ring with plain yellow grease, which helps the injector seat snug and not rip the O-ring, and crucially, assists the O-ring to UNTWIST itself after fitting. This is VITAL. Injector O-rings must NOT be twisted in their grooves - they may leak fuel up into the lube-oil system.

After a good session purging the fuel galleries, I switched OFF the key, THEN decked and held down the throttle (puts injectors in "bleed mode") and turned the key to starter, FIVE SECONDS and she's fired up, but SMOKING LIKE a wet grass bonfire. Once round the block (empty country roads) and smoke gone.

Today ... starts INSTANTLY, goes like a rocket, and NO SMOKE whatever.

So I CAN run on FREE reclaimed oils, filtered through my centrifuge.

Next time I won't waste any time over injector washers, and I will carry a full set in the car, as with three fuel filters and a few tools.

CharlesY

hi guys thanks for all the info.

not a drop of oil at the ecu, am still going to change the injector harness tomorrow and see how i get on. if i still have a problem after that i think i will join the AA call them out to diagnose the problem, will let you know how i get on

cheers guys

steve s said:

hi guys thanks for all the info.

not a drop of oil at the ecu, am still going to change the injector harness tomorrow and see how i get on. if i still have a problem after that i think i will join the AA call them out to diagnose the problem, will let you know how i get on

cheers guys

Click to expand...

What are the symptoms today?

Is it smoky on startup?

Is is slow to fire up from cold?

Does it take a while to fire up even when HOT?

Does it run OK once it is running?

If you say "yes" to 2 or more of these, fit new injector washers and O-rings as soon as possible.

CharlesY

Have you checked your MAF and MAP sensors?

I had a bad misfire changed the MAF and it went completely

if you still have your egr the MAP sensor id very likely to be al gunged up, its worth cleaning it

my ecu had some oil in the red plug (harness changed now) but it wasnt causing a misfire

hi all

well ive fitted a new injector harness and i,m afraid everything is still the same still got the misfire.
thanks for the info about maf and map sensors will look into that and see how we get on
thanks again

well just checked the map and maf sensors, the map was fairly clean, so cleaned it and put back. what should i be looking for with regards to the maf sensor?
thanks guys

hi
i think the injectors are the next step for me, not that confident about doing them myself(no where near the west midlands are you) anyway we shall see, i think i need the td5 on a diagnostics machine.

steve s said:

well just checked the map and maf sensors, the map was fairly clean, so cleaned it and put back. what should i be looking for with regards to the maf sensor?
thanks guys

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You really need to check the voltage output with a nanocom or such like if it doesnt put out the correct reading (dont remember the exact figures) its knackerd.
you could try cleaning it carefully, I used a cotton bud dipped in brake cleaner but dont bend any of the links on the probe!

I also had a brand new MAF that was putting out the correct voltage but was still causing a misfire!! but as long as you use genuine parts I think that was very unusual
the other way to check it is to unplug it and go for a drive, the ecu will refer to a base reading and you "should see if its that thats giving you grief! If your maf is working properly you will notice some loss of power by doing this, if its not working properly you might see an improvment

steve s said:

hi hope someone can help.
a misfire appeared a few days ago now it just about starts.
i changed the fuel filter just in case, no change
so tomorrow i am changing the injector harness and am hoping this might cure it but i am not to hopeful.

any ideas would be appreciated

regards
steve

Click to expand...

Hi Steve, I have just had a loss of power problem sorted after weeks of trouble. Went in to workshop on tuesday and mech. said there was a misfire as well as the other probs.:doh:

Not sure whether yours is the same but we changed the fuel pump and I changed the MAF some weeks ago.

If you need the parts try these two sellers on Ebay!

glowplugman1 disco maf £34 inc p+p. £89 + vat LR

thelandroverexpert intank fuel pump £130 + p+p. £240 + vat LR.

pump is easy to change. lift boot carpets from edges and loop up so you can see a plate in middle of boot floor. undo screws and theres the pump.

hope this helps.

steve s said:

hi
i think the injectors are the next step for me, not that confident about doing them myself(no where near the west midlands are you) anyway we shall see, i think i need the td5 on a diagnostics machine.

Click to expand...

Hi steve, if you can't find anyone with a comp. pm me and I will get you into the workshop I use.

steve s said:

hi
i think the injectors are the next step for me, not that confident about doing them myself (no where near the west midlands are you) anyway we shall see, i think i need the td5 on a diagnostics machine.

Click to expand...

No diagnosics machine will even know about leaking injector washers.

I am in central Scotland ... at least 300 miles each way, but I feel sure there will be someone on Landyzone who would tackle this for you.

If it is lousy to start hot or cold, smokey on start up, and if the fuel pump makes funny noises when you turn the IGN on, it is practically certain one or more of the washers is leaking.

As far as I know there is no way to work out which one of the five it is, and it might be two or more.

It is not a difficult job. However, it needs care and attention, and an understanding of how the injectors work, and the need to UNDO the injector rockers, clean the seats in the head, and stuff like that.

Mine practically explodes into life now. Amazing.

CharlesY

hi just wondering wether i could contact you via phone and ask you about the process for removing the injectors
regards steve

steve s said:

hi just wondering wether i could contact you via phone and ask you about the process for removing the injectors
regards steve

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Where are you?

If you don't have the FREE Rave Manual, get it before trying to speak to me or anyone else.

The job is dead easy, but needs care and attention.

Best see it done first time if you are not experienced.

CharlesY