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| Cheshire110 Member Since: 26 Jul 2013 Location: Cheshire/London Posts: 2743  
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Has the fuel filter been changed recently?
I'd start there if not been changed in the last year or two. Worth doing anyway even if not causing your problems. The BAS website search function on the left of the page here http://bellautoservices.co.uk Can be used to identify fault codes if you're generating any. Cheers, David Land Rovers of all shapes S3 onwards… Daily is a 110 V8. |
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13th Jan 2015 6:55pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17213 
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Odd erratic running with no relevant fault codes is often indicative of a faulty Volume Control Valve (VCV) on the fuel pump. It costs about Ł100 for a new one, and is a very fast moving part in both LR and Ford dealers.
There's quite a lot about on the forum if you use the search facility. |
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13th Jan 2015 7:09pm |
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| boatman Member Since: 13 Jan 2015 Location: london Posts: 2 
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Thanks for that guys. Yes, we have changed the fuel filter. First thing we tried.
The VCV does look like the most likely culprit. I'll change that. Do you need the diagnostics to change it? Other suggestions I have seen, centre around the immobiliser but this vehicle strangely doesn't have one. Either it was never fitted which is unlikely or its been removed. |
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14th Jan 2015 11:22am |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971 
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you don't need diagnostics to change it, but you do need diagnostics to then tell the ECU to calibrate itself to the new valve (and a few other related bits and bobs). From my reading, it will work without telling the ECU but you won't get any of the benefit of having changed it.
I'm not 100% sure on this, but from what I've read it seems none of the usual DIY diagnostics things (Lynx, Hawkeye, Nanocom) can do the required magic which is quite irritating. |
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14th Jan 2015 2:10pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17213
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As Cupboard says, you can physically change it without any diagnostics but you do need to recalibrate the valve (ie carry out a fule pump learn cycle) and this requires a diagnostic system.
Nanocom cannot do this, Faultmate can, I am not sure about other systems since those are the two that I use. The vehicle will run, but not necessariy very well, prior to the pump learn, and will although store a DTC to the effect that the pump hasn't been recalibrated (no MIL, no limp mode though). It is actually very easy and quick to change (10 mins), but the pump recalibration should be done with the engine thoroughly warm and at normal running temperature. |
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14th Jan 2015 3:21pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5575 
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If it's your vcv has failed causing non starting, fitting a new vcv will allow engine to run and vehicle to be driven, but possibly noisily and not perfectly. As mentioned there are only a couple of bits of kit that can recalibrate the new one.
I am sure your vehicle will have an immobiliser, but it may have been deactivated, but that does not say it's not playing up. Andy |
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14th Jan 2015 4:52pm |
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