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blakken
Member Since: 11 Feb 2017
Location: Brännberg
Posts: 14
  
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my disco3 is shuddering in idle and upp to 1500rpm den its fine.
checked with auto maxicheck mx808
idle 760 rpm
injector
1-965
2-909
3-1345
4-1007
5-985
6-825
fuelpressure 22000 idle 55000-60000 2500rpm
tested Hawkeye
idle765 rpm
injector
1-1.04
2-0.91
3-1.26
4-0.91
5-1.00
6-0.87
fuel pressure 22000 idle. 60000 2500rpm
so is time for new injectors. car is on 390000km 
its starts fine but in colder weather its more shuddering
best regards from Sweden
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 1st May 2022 12:22 pm |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
 
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Before I changed mine I noticed an unstabe idle when engine was cold sitting at traffic lights, which was worse in the winter.
Things I noticed with new injectors fitted, smoother idle, much much better starting especially in cold weather, no difference in mpg at all, I think it has more mid range grunt but that might just be a placebo effect.
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| 1st May 2022 1:32 pm |
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altblech-schrauber.de
Member Since: 15 Feb 2021
Location: Lingen
Posts: 26
 
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i had unstable injection values as well, after much fiffling around with at least 4 Injectors i made the Asumtion that not the injectors are at fault, more likely the engine or some other parts.
Turned out that my knock sensors where bad and this also triggerred erratic idle and balance values
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| 2nd May 2022 7:22 am |
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eightfoot
Member Since: 12 Apr 2015
Location: sunny essex
Posts: 762
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blakken wrote:my disco3 is shuddering in idle and upp to 1500rpm den its fine.
checked with auto maxicheck mx808
idle 760 rpm
injector
1-965
2-909
3-1345
4-1007
5-985
6-825
fuelpressure 22000 idle 55000-60000 2500rpm
tested Hawkeye
idle765 rpm
injector
1-1.04
2-0.91
3-1.26
4-0.91
5-1.00
6-0.87
fuel pressure 22000 idle. 60000 2500rpm
so is time for new injectors. car is on 390000km
its starts fine but in colder weather its more shuddering
best regards from Sweden
i would try some injector cleaner in the fuel and premium diesel for a few tankful's first then see where your at please excuse any grammer/punctuation mistakes,i'm thick,thankyou
current vehicles 2005 d3 2013 d4
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| 2nd May 2022 9:33 am |
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blakken
Member Since: 11 Feb 2017
Location: Brännberg
Posts: 14
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I have tried that a few times with out results!
I have tried 2stroke oil..nothing!
I will test the knocking sensor and se
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| 2nd May 2022 12:45 pm |
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blakken
Member Since: 11 Feb 2017
Location: Brännberg
Posts: 14
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It idle fine but when i hit the pedal its start chuddering up to 1500rpm
I disconected the knocksensor its the same.
And when i rev it and let off trottle and rpm lowers its start chuddering from 1500rpm to idle and be stable.
How is the injectors place inj1 where is it on engine and so on?
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| 2nd May 2022 4:24 pm |
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Breg90
Member Since: 04 Feb 2017
Location: Falkirk
Posts: 348
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Do you have erratic idle, smething like reving up to say 1300 rpm (with no throttle peddle input), drops back down and repeats on about a 2 second cycle? If so consider checking the oil temperature sensor for a plausible output. Mine failed to something like -32C. Makes the engine idle erratic/engine to rev on idle. You should be able to check via your code reader. Series one 1949 - in bits, chassis is strapped to the ceiling in my garage (beside the canoe)
LR 90 - In bits
Disco 3 - currently in bits
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| 3rd May 2022 9:46 pm |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
 
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Did you clean your MAP sensor allready?
You will be amazed how much gunk is collected in the inlet manifold and therefore the sensor there
Have a read here:
https://www.disco3.co.uk/forum/go-clean-ma...hlight=Map Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. 
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| 3rd May 2022 10:35 pm |
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blakken
Member Since: 11 Feb 2017
Location: Brännberg
Posts: 14
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i have new air flow sensor new map sensor
new fuel filter new air filter.
can some one tell me the injection mounting position on engine.
from front of car left sid front to rear and right side front to rear.
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| 4th May 2022 9:03 am |
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blakken
Member Since: 11 Feb 2017
Location: Brännberg
Posts: 14
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Breg90 wrote:Do you have erratic idle, smething like reving up to say 1300 rpm (with no throttle peddle input), drops back down and repeats on about a 2 second cycle? If so consider checking the oil temperature sensor for a plausible output. Mine failed to something like -32C. Makes the engine idle erratic/engine to rev on idle. You should be able to check via your code reader.
no its idle fine.
just apply throttle its start to shuddering up too 1500rpm then its ok and when let throttle of its start shuddering from 1500rpm down to idle.
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| 4th May 2022 9:08 am |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
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blakken wrote:
can some one tell me the injection mounting position on engine.
Hi, why don't you do some research yourself in the WIKI here on this forum? and you will find the workshopmanual with all the details you need incl. the inj position
https://www.disco3.co.uk/wiki/Discovery_3_...air_Manual
section 303-01C Engine- 2.7L Diesel will give you the details you want...
 Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
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| 4th May 2022 9:42 am |
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blakken
Member Since: 11 Feb 2017
Location: Brännberg
Posts: 14
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 Didnt now it there.
Thanks man now i will read.
Need to digg in deper in this problem and this forum and wiki😂
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| 4th May 2022 10:17 am |
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