 | Home > Puma (Tdci) > Engine surging 1200-2000 rpm under load eg climbing a hill |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17361   
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InitIal thought, VCV.
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2nd May 2020 8:29am |
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| ickle Member Since: 22 Jul 2010 Location: South Vendee Posts: 1777  
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Fuel filter / fuel starvation?
Keith |
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2nd May 2020 8:31am |
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| swt Member Since: 24 Aug 2018 Location: Cumbria Posts: 162 
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My 2008 is doing something that sounds very similar, worse when cold, albeit at just over 90k. I've recently changed the fuel filter so was thinking VCV. It's not enough of an inconvenience to be bothered yet.
They do eat money, but mine is now 12 years old; it's back from the dead (praise be, Dave Ashcroft) having been written off by a lunatic driver while parked, and it's the first time I've ever kept a vehicle for more than 5 years. My wife has had 3 vehicles in the same period, two of which cost more than the Landy did. Seems a pretty reasonable cost when you look at it that way. |
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2nd May 2020 12:38pm |
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| Quattrocow Member Since: 02 May 2020 Location: Yorkshire Posts: 3 
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Sorry I am a bit of a green horn define VCV please. I will have a look at the garage invoices to try and identify when the fuel filter was last changed. All your help much appreciated Richard |
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2nd May 2020 1:24pm |
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| swt Member Since: 24 Aug 2018 Location: Cumbria Posts: 162
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It's the fuel vapour control valve, located on the back of the pump. If you search the forum for VCV, you'll find several good threads, including the symptoms that have been observed with a faulty VCV: we shouldn't rush to the conclusion that that's the fault, but it does sound like a possibility.
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2nd May 2020 2:00pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17361
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Strictly it's the volume control valve (commonly misnamed, even by Ford and LR as vapour control valve) and it regulates the flow of fuel from the low pressure stage of the fuel pump to the high pressure stage, and by so doing regulates the pressure in the common rail. It is constantly modulated by the ECM to adjust the common rail pressure appropriate to the engine demand.
Unfortunately it is rather fragile and very easily damaged by poor fuel, and especially by water in the fuel and/or the presence of the "diesel bug". It also lacks robust monitoring by the ECM and consequently it can malfunction quite significantly before any DTCs are logged. Generally with the 2.4 TDCi motor, a misfire or irregular running with no DTCs is a strong indicator of a faulty VCV since most other faults will cause DTCs to be logged. It's a small valve located on the rear of the pump and is awkward to change due to access restrictions. |
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2nd May 2020 3:05pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20325
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VCV details here if helpful:
https://www.defender2.net/forum/topic71207.html?highlight=vcv There is a pic of mine showing it's location, torque specs and a supplier I used. Failed Clutch switch is possible too of course. ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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2nd May 2020 4:55pm |
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| dgardel Member Since: 30 Nov 2008 Location: Veneto (Heart & Head) Posts: 3586 
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  Discovery 5 td6 HSE Stornoway Gray Outback Engineering Limited Edition
IID Pro MV License |
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4th May 2020 1:27pm |
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