stephenw46
Member Since: 22 Jun 2011
Location: West Midlands
Posts: 1214
  
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| injector readings help required |
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hi there my lovely d3 ad lost fuel econemy so ive replaced intercooler and pipe and today deliverd caravan to dealers its now gone from16mpg up to 22.3 on 43.5 mile trip of aroads duel carriage way and motorway top speed 60mph and cleared trip and back solo 34mpg when i got back started looking around and checking over her I pluged the hawke eye in and checked the live data and these are the readings
injector 1= 1.04
2= 1.01-2
3= 1.14
4= 0.97
5= 0.90
6= 0.92 these reading are at tick over and when the engine is reves are increased slightly they all read
1.00 the engine is runing fine and no faults stored are these readings ok or should i look at replacing all the injectors as i love my d3 i dont want her letting me down ps she as now done 110,000mls and would like her to beat the 470,000mls by a fellow member on here, any assistance is very much appreciated regards steve
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 14th Apr 2012 4:59 pm |
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Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20837
  
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| Re: injector readings help required |
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stephenw46 wrote:43.5 mile trip of aroads duel carriage way and motorway top speed 60mph and cleared trip and back solo 34mpg...
... the engine is runing fine and no faults stored
If its not broken, and runs fine, why go looking for faults?  My D3 Build Thread
TDV8 Retrofit Build Thread
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| 14th Apr 2012 8:59 pm |
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stephenw46
Member Since: 22 Jun 2011
Location: West Midlands
Posts: 1214
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thanks may be reading of faults before they occure many thanks reards steve
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| 14th Apr 2012 9:10 pm |
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character
Member Since: 31 Dec 2007
Location: wiltshire
Posts: 5781
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ahhhhh, yes remember this welll 
couple of observations for yer to ponder:
first of all check to see whether there is a fault code logged which would read something like "balance offset injector 3, cylinder X is at tollerance"
injector 3 balance offset is getting to the top end of tollerance (ie 0.7-1.3) which would indicate that it is a) overcompensating for another injector b) injector is failing.
However the first thought would be to change injector 3 as that is at a higher level but as two others are just a tadd higher it could be that one of those are failling and injector 3 is trying to balance off the shortfall.
From personal experience it would suggest either a compression issue or simply an injector failure issue in particular as you've had varying fuel consumption, so the FIRST point of call would be to have a compression test done to identify which side of the engine/which cylinder is having issues before you change any injectors for the following reason:
a) every time you replace an injector in the port the connectors/fuel pipe are "one fit only" and cost £50 each
b) as these are pezo injectors you cannot simply run the engine, disconnect each injector one at a time to find where the compression issues are as you will fubar the injector/s and at the best part of £200 plus each you'd be better off spending the dosh in identifying the real issue rather then simply hoping that injector 3 is the cue (if only a so called "injector specialist" remembered this when they did mine, they'd not be paying out £100's in compensation  ).
c) where the 105k belt service might have been done recently, LR dealers use locking pins to position the pulley whereas some "traditionallist" use a white mark which can lead to the crankshft being out of alignment, thus knocking out a valve, hence loss of compression.
d) it might be that having replaced what you think to be a faulty injector might result in the vehicle displaying a "misfire"
So from my personal experiences recently, approach with caution but in a logical fashion and get its looked at as soon as possible 
BTW, the default to 1.0 across the range when you put the pedal down is common and even when you've changed all the injector for new ones
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| 15th Apr 2012 8:11 am |
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pinhead
Member Since: 20 Dec 2010
Location: yorkshire
Posts: 877
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personally if 0.7 - 1.3 is the expected tolerance then they are within spec and ok
first thing i would do is change fuel filter (use a genuine one) and shove a full bottle of fuel system cleaner through it "thats if you are concerned" and then see what your readings are after that
my opinion is that you have sorted your mpg out if it has gone up straght after the intercooler pipe replacement and you are just worried and trying to find somthing
the injectors on a d3 are on the whole very reliable with not many posts if you search the site relaiting to faults with them unlike egr valves, turbo actuators, juddery auto box and suspension bushes that will make up nearly every other thread
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| 15th Apr 2012 8:37 am |
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stephenw46
Member Since: 22 Jun 2011
Location: West Midlands
Posts: 1214
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thanks for the replys av put some injector cleaner in tank will see how it goes because the wife as now driven it and asked me what i av done she says its got a lot more power then ever before and if shes happy that will do for me
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| 15th Apr 2012 3:09 pm |
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stephenw46
Member Since: 22 Jun 2011
Location: West Midlands
Posts: 1214
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I called up landrover and spoke to the tech guy there that i must say i do trust as when the car was under waranty he allways explained every thing to me as he knew i was hgv mechanic his awnser to me was that the ecu runs the injectors and that i should take the readings again when cold when warm and when at its normal runing temp and ring him back so i did he said before you tell me i bet they are all different again so stop worying unless it is playing up, so from now on unless something is wrong iam chilled out again all runing fine getting 32mpg around town I love my d3 thanks to you all regards steve
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| 17th Apr 2012 6:41 pm |
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