Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26701
I don't think you are wrong. IIRC there is a relationship in the injector value to the power generated on the firing stroke of the previous cylinder in the firing order, so if the previous cylinder has a problem, the next cylinder has to compensate to keep the revs steady.
Maybe utter ballcocks, but I'm sticking with it until someone comes up with a better idea
5th Mar 2015 11:22 pm
MattTheTall77
Member Since: 24 Oct 2013
Location: Lincs
Posts: 266
Thanks for the advice and information all In for its service next month so hopefully it'll hang together till then haha
I've just noticed that the firing order is the same as the injector number Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
_________________________________________________
Disco Picture Website Here
28th Sep 2015 9:14 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
I did write it down and everything, back on the first page!
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 11 Oct 2012
Location: Gironde
Posts: 174
Hi, here is the data for. 2006 tdv6 with 340,000km. See 48-51. Sixth injector and maybe fourth ready for replacement. Also need to investigate oil temp gauge!
Discovery 3 tdv6 data list
Delphi diagnostic
1 battery voltage 13.9v engine running and hot
2 baromic pressure 101%
3 boost air temp 22
4 fuel rail temp 18 (16-19)
5 ecu temp 43
6 accel pedal position 0
7 accel pedal position 2: 0
8 cruise control input circuit 4.4v
9 internal module operating voltage 1: 5.0v
10 as above 2: 5.0v
11 engine oil temp -17!!!!!!
12 mass air flow meter 16g/s at idle (15-17)
13 boost pressure adjustment bank 0: 63%
14 egr valve command 0: 0%
15 as above 1: 0%
16 pressure control valve 13%
17 volume control valve 24-25%
18 engine torque requested by driver -108Nm
19 0.7v accel ped pos 1
20 0.4v accel ped pos 2
21 ambient temp 11
22 D.C.-DC converter 58v
23 time since last engine start
24 vehicle speed set 0
25 brake switch: inactive/active
26 water in fuel sensor: no water in fuel
27 cranking: inactive
28 fuel pump secondary circuit: active
29 starter motor: inactive
30 fuel pump secondary circuit: active
31 glow plug relay: inactive
32 coolant temp: 73
33 fuel pressure: 22MPa
34 intake air temp: 17
35 inlet manifold pressure: 98kPa
36 accel pedal position: 0%
37 ignition on: 13.8v
38 engine speed: 758rpm
39 alternator feedback 28-34%
40 egr throttle demand: 0%
41 egr throttle position 72%
42 egr throttle position bank 15%
43 as above 5%
44 variable fan duty 0%
45 fan speed sensor unit 290-440rpm
46 cruise control input: no button pressed
47 cylinder balancing offset - injector 1: 715
48 injector 2: 615
49 injector 3: 720
50 injector 4: 850
51 injector 5: 660
52 injector 6: 1380!!!!
53 water in fuel: zero occurrences
54 occurrence distance travelled: 0
55 occurrence 1 mileage at failure: 0km
56 occurrence 2 distance travelled: 0
57 occurrence 2 mileage at failure apparition 0
58 occurrence 3 distance travelled
59 occurrence 3 mileage at failure appearance 0
60 ditto 4
61 ditto 4
62 alternator regulation 47%
63 alternator set point voltage 15.8v33370 Fargues Saint Hilaire
24th Feb 2017 8:10 pm
Shutts
Member Since: 26 Nov 2011
Location: Tiptree
Posts: 146
Been having starting issues, cranking for about 5 seconds before firing up. Had the same issue a few months back which was cured by couple of injectors being replaced, even though is seems to have been temporary.
Armed with my shinny new IIDTool I thought I would check the injector offset to see if there was an issue there.
Being a geek, and because the cylinder to injector mapping is a bit hard to follow, I used the info in the previous posts to create the following:
Based on the info, and the assumption that the next cylinder compensates for a bad one injector, I think I will start with injector 6 then move onto injector 2. However as most of you guys know your way round the IIDTool and discos better than myself I would value your opinion.
2005 D3 SE
1998 Disco 300tdi - slow play thing
1995 Defender 300tdi - Winching play thing
Aprilia RSV 1000 - fast play thing
Honda CR250 - noisy play thing
Member Since: 26 Nov 2011
Location: Tiptree
Posts: 146
Thanks Mickey.
So it's the high ones I need to worry about and not the low ones. My mate has a lowish mileage blown engine so might borrow the injectors from that to see if it makes a difference.
Do you think the readings shown for the injectors would cause the slow starting or should I be looking somewhere else?
Shutts
PS. is there a reason only the link is in the post for the picture and the picture itself has not loaded.|____000_
[l_|__\___\,___
l--___--_[O==O]
()_)' '()_)-----()_)
2005 D3 SE
1998 Disco 300tdi - slow play thing
1995 Defender 300tdi - Winching play thing
Aprilia RSV 1000 - fast play thing
Honda CR250 - noisy play thing
Member Since: 24 Sep 2015
Location: Melbourne
Posts: 76
I watched a good video the other day on a mechanic who tested balances on scan tool, did a leak off test and sent the same injectors off to be bench tested.
The scan tool balances and return leak test were pretty useless for troubleshooting purposes.
A bench tested confirmed injector 1 and 4 were enough to start to cause damage to pistons. If you looked at balances it showed 4 and 6 were bad. Leak off test suggested 5 and 6 were definitely bad.
Going by the LR TSB for the bad cold start issue LR would have replaced 5 and 6 but it wouldn't have helped at all and the person would still have been at risk of damaging the pistons and only symptom was a rough cold start.
If one has gone id replace all of them especially if they have done 200,000km+ just for insurance being a common rail and the fact other common rail engines (Hilux) they recommend replacing them every 160,000km to avoid issues.
28th Oct 2017 12:11 pm
maplecottage
Member Since: 01 Feb 2011
Location: Norfolk
Posts: 3171
Following on from my progressively poor starting issues it would appear that I now have a significant injector issue.
Using Robbie's helpful cylinder mapping pic, my IID figures would appear to indicate that the left bank (cyls 4, 5 & 6) are all reading high and will require some significant investigation.
Hope to do a leak off test in the coming days but suspect the wallet is about to take a hit (don't tell swmbo or she'll be wanting to push it down to the knackers yard - again )
14th Nov 2017 12:01 pm
Weedyapl
Member Since: 24 Sep 2015
Location: Melbourne
Posts: 76
I played the injector chase game and came up second best 5&6 were high like 1300 and 1400. Replaced both and now 1, 3 and 4 are high and 5&6 are very low like 600 & 700. I regret only doing two.
Leak tests are inconclusive and a bench test here by one of the two biggest diesel injector places here costs almost as much as replacing ($150 to test each one not inc removal or reinstallation which was like $110 per injector) so its a no brainer for me im just getting rest put in for insurance.
My petrol 2001 fuel injected ford had injector issues around the same mileage so to me at least 200,000km or there abouts is more then enough for a set of extremely hard working commonrail injectors.
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
In for its service next month so hopefully it'll hang together till then haha
)
