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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5779
  
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50% right, 50% wrong....... WHAT YOU SHOULD BE ASKING IS "WHY IS MY INJECTOR FAILING, IS IT THROUGH OLD AGE (IE HAS NEVER BEEN CHANGED SINCE THE CAR CAME OFF THE LINE) OR IS IT MASKING A MUCH BIGGER ISSUE
this FAILED injector could actually be telling you that you have a compression issue and at present is working to balance the engine.......the injector HAS MOST LIKELY FAILED hence the fault code and no doubt the large variation between the readings of each injector (which should be no more than around 15% difference). At present you are more than likely running on 5 of the 6 cylinders but its very easy not to notice it.
Can I just say for the record - pezo injectors (which is what you have) do not last for ever like yer glow plugs and should be changed when the reading reach the upper end of the scale (700 - 1300 tollerance) ie around 15% higher than any other injector OR when over 1000. If your cars ecu displays the dreaded p02a2 code then its not debatable factor - its needs to be changed as soon as - it has technically failed but the other injectors are trying to balance out/make up for it.
Now from personal experience, YOU DO NOT DISCONNECT/TEST ANY pezo injector WITH THE ENGINE RUNNING as this could leave the injector in a charged state and therefore when you start the engine after reconnecting, it could lead to flooding the chamber and thus scold the piston or pressure will build that will crack the piston - THIS IS LR WORKSHOP ADVICE OR THE ELECTRICAL CHARGE COULD RESULT IN A CORRUPTED ECU.
So the cheapest option first - do a resistance test on the engine wiring loom to check for breaks, if ok then do a compression test/leakage test, then change yer injector (at £240 plus vat, plus fitting, plus vat)
Do not change all the other injectors at a cost of £1500 (like what I did). If you do go to changing the injector and its turns out to still misfire/fault code present, then chances are its gone and should not be used again without a test to ensure its not been left charged (cost around £25 at most diesel injection specialist) BUT MAKE SURE YOU KEEP THE INJECTOR UPRIGHT AND WITH THE PLASTIC CAPS ON THAT IT CAME WITH (coz if the fuel inside which effectively kickstarts the thing working is allowed to drain, then yer in to reconditioning it).
So take the advice from someone who has just spent £10.5k replacing his engine FOR EXACTLY THE SAME FAULT CODE - get it changed, if the misfire remains then its masking a compression issue on that side of the engine and in which case DO NOT REPLACE ANY OTHERS until you have done a compression test AND a leakage test. 
Sorry if I'm shouting, but you started the process - you have the reading/injector balances that confirm it is engine/injector related - BTW I have never heard of a gearbox flush to sort out a misfire - if yer ecu is that fried to do what others have said it does due to a gearbox flush, why would you not change the ecu 
Last edited by character on 13th Mar 2012 12:14 am. Edited 2 times in total
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 12th Mar 2012 11:09 pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5779
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BTW, just looked up yer fault code on LR - yep the same as us:
P02AE - Fuel injector circuit high resistance, fuel injector short circuit to ground, fuel injector circuit short to power, injectior leak, cylinder compression low, cylinder leakage past the injector, cylinder leakage past the glow plugs, mechanical fault, valve, piston/ring, etc, injector fault.
ACTION
Refer to the electrical guides and check the fuel injector circuit. Check the injector and surrounding area for evidence of fuel leakage. Disconnect the injector and check for evidence of fuel leakage in the connector. Rectify as neccessary. Clear the DTC's. Reconnect the injector and start the engine. Allow to warm up to above 60 degree(140F) and allow the cylinder to idle (cylinder balance diagnostics is now active). If the DTC resets, check for cylinder leakage and rectify as necessary. Clear the DTC and recheck. Carryout compression test only if the DTC's reset. If the above tests are within range, then install a new injector.
BTW no mention of gearbox flush 
Last edited by character on 13th Mar 2012 9:59 am. Edited 1 time in total
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| 13th Mar 2012 12:03 am |
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Valhalla
Member Since: 23 Oct 2011
Location: Isle of Skye
Posts: 124
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| Re: Discovery 3 engine surging |
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Ian1976 wrote:Hi, my wife has a d3 and I noticed that when driving it the engine sort of surges and the rev counter moves with the surge as you driving, hope someone can help.
Also updating to d4, got rear lights with resistors andcalso led front lights, can anyone give me a link or advice on the wiring or the front and back?
What year is the D3? Early ones could be badly thrown out by failing injectors and/or compression low on one or more cylinders. 2008 onwards should be better, and this is more likely to be down to an airflow problem.
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| 13th Mar 2012 2:31 am |
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sarumlight
Member Since: 07 Nov 2008
Location: Off the Plain
Posts: 1590
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It's a 2005 according to the little picture under Ian's post! (Let your mouse pointer hover over it.)
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| 13th Mar 2012 12:25 pm |
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bw_306
Member Since: 31 Jan 2012
Location: Canterbury
Posts: 132
 
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Thanks for all the information, i will follow up all these leads and see what i can find out. The gearbox flush first came to my attention when reading the following post on an injector problems thread...
Quote:After all the problems, I did a lot of digging regarding common rail pressure senders, gear box speed senders, Injection pump pressure valve. etc.
I had read some storys about the ZF Auto box giving the affect of engine misfire and vibration when you put the power on or towing up hill.
so I thought it was the cheap option to replace the gear box sump which contains the filter and change the gear box oil.
And Guess what ???. Cured the faults, Unbelivable, drives completly diffrent now.
Can't believe that the auto box oil would make all that much change.
The oil was very dark and was well used. I am at present running on Dextron 2 for a week than going to change the oil out for Dextron 3 as this is the higher grade to use if you want it for long life ( they say upto 130k)
I,m a Agricultural engineer and have never sean such odd thing happen to a vehicle that the gear box oil would cause. We recon the oil was not holding pressure in the converter stator so letting go and then catching up this upset the EMS and causes the injection system to compensate giving the resulting red herring results.
Hope this might help some one else out there and save some money.
Maybe I have more than one issue, injector/engine, and gearbox...
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| 13th Mar 2012 11:32 pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5779
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I think you missed a bit below that.........
" thought we were on to something regards the original post by Liston, however having now spoken to him it would appear to be the case of the gearbox judder showing up at the same time as the injectors - not related but he is going to run autologic to see if his is running fine now that its had new injectors for a while which is going to be very valuable info for all of us with the P02A2 fault code"
Last edited by character on 13th Mar 2012 11:45 pm. Edited 1 time in total
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| 13th Mar 2012 11:41 pm |
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bw_306
Member Since: 31 Jan 2012
Location: Canterbury
Posts: 132
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Ahh yes!
Will re - read!
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| 13th Mar 2012 11:44 pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 5779
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listen yer a grown man, the options are there, in the words of dragons den "I'm out" 
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| 13th Mar 2012 11:47 pm |
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little_gray
Member Since: 02 Oct 2015
Location: Tamworth
Posts: 2
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Sorry to bring this back to the top - but my disco just last week began to suffer from this problem.
Really odd on a cold start, bouncing revs (only slightly) and if i revved it too much the engine would surge.
I booked it in for a service and told the guys about the problem - came up fault free on the service, but the chap said that the fuel filter and a few other bits and bobs looked like they hadnt been changed in an age.
Picked it up today and the drive was a different car!
i got mine done at: http://www.rkautomotive.co.uk
Luckily in my home town - been in business 28 years and i can see why! Top stuff!
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| 6th Nov 2015 1:32 pm |
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Riggs
Member Since: 16 Apr 2017
Location: Auckland
Posts: 6
 
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Hi little_gray.
Can you tell me what else they did apart from the fuel filter?
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| 30th May 2017 8:56 am |
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