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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20279
United Kingdom 
Accidental double post*

Last edited by custom90 on 4th Nov 2024 8:58pm. Edited 1 time in total
Post #1050763 4th Nov 2024 8:51pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20279
United Kingdom 
That does mean that the existing fault could well still be present then.

I think, if I remember the VCV is on the low pressure side of the fuel pump. (If I recall correctly).
So beyond that, downstream so to speak is the high pressure side, hence where there could be the origin of the DTC.
Then there is the PRV, and the Injectors.

As there isn’t a DTC for the CP sensor and C sensor, I’d tend to still look towards going for the VCV change.
And clearing that code after manually recording it.

Beyond that, look at the Injector pressures parameters with a garage if the OP can’t do that.
Worst case scenario the fuel pump it’s self, but leave that until all other cheaper options are explored.

It’s quite easy to change the VCV just keep the work area really clean and be careful with it.
Thumbs Up

Later edit**

In summary, the P268B error code indicates an issue with the high-pressure fuel pump calibration not learned/programmed. This error code could have several root causes including high-pressure fuel pump failure, fuel pump control module failure, (VCV Possibly?) wiring problems, or dirty fuel filters. The most effective solution to this error code hinges on accurate diagnosis and repair by a certified mechanic to achieve the best performance once again.
Post #1050766 4th Nov 2024 8:58pm
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Waka56



Member Since: 08 Nov 2023
Location: Hamburg
Posts: 158
Germany 
I went back to January when I changed my injectors, I could do the injectors learning, but not the pump relearn if I remember well. Already back then I had the P268B. I think I deleted the error and since the engine was running really well it slipped my mind. Making my Defender great again. (Or trying to at least xD)
Post #1050772 4th Nov 2024 10:53pm
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jim4244



Member Since: 13 Apr 2014
Location: Bedfordshire
Posts: 771
England 2007 Defender 90 Puma 2.4 CSW Zermatt Silver
Why don’t you just change the VCV? It’s a 20 minute job at most.

Jim
Post #1050780 5th Nov 2024 7:33am
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hank



Member Since: 12 Sep 2016
Location: South Wales
Posts: 2290
Wales 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
jst wrote:
I have changed a vcv on a rough running vehicle and it then wouldn't start. Took new off checked it and refitted, still wouldn't start.

Fitted another one new one and it worked perfectly.


I have had this too. Honestly change the VCV.
You say have one there in the box - it is a ten minute job and only needs an allen key.
Why would you not?

Read my post here about time and money wasted when the cause was the VCV all along https://www.defender2.net/forum/topic53240-245.html > 110 XS Double Cab
Post #1050782 5th Nov 2024 8:07am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17316
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
custom90 wrote:
...
I think, if I remember the VCV is on the low pressure side of the fuel pump. (If I recall correctly).
So beyond that, downstream so to speak is the high pressure side, hence where there could be the origin of the DTC.
...


Indeed. The VCV is located between the LP and HP stages of the pump and regulates the amount of fuel passing from the LP to the HP, consequentially regulating fuel rail pressure.
Post #1050783 5th Nov 2024 8:12am
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Waka56



Member Since: 08 Nov 2023
Location: Hamburg
Posts: 158
Germany 
jim4244 wrote:
Why don’t you just change the VCV? It’s a 20 minute job at most.

Jim


I think I just should get to it, it´s just that I have seen from 10 mins to 2 hours job haha. Making my Defender great again. (Or trying to at least xD)
Post #1050788 5th Nov 2024 9:03am
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20279
United Kingdom 
Do it, you know it makes sense you only need a ball ended hex (Allen) key, just don’t overtighten the fixings, just nip them up that’s all.

Job done. Mr. Green
Post #1050820 5th Nov 2024 4:57pm
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Waka56



Member Since: 08 Nov 2023
Location: Hamburg
Posts: 158
Germany 
7 N.m Thumbs Up
Tomorrow before work. Making my Defender great again. (Or trying to at least xD)
Post #1050821 5th Nov 2024 5:05pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20279
United Kingdom 
Blackwolf - Good to hear, so I would have thought if the injectors were seeing below expected pressures compared to standard parameters say at idle, then the VCV could be tracked down to being the cause.

Though there is a possibility that one injector or even two injectors might be out of range but all four, would be far less probable. (That would suggest injectors need replacing anyway).
So that could be used as an example, I seem to remember the rail / injector pressures are very high somewhere in the region of 20 to 26k PSi, (approx, don’t quote me on exacting pressures) so certainly not something to handle when active I.e the injectors themselves..

What is the typical signs of injector issues out of curiosity? I know that the spray pattern can go out of uniformity so to speak with age, but I can’t see how that can be found unless sent for testing.
I would imagine, even though expensive that it practically pays just to replace, than to mess around with testing, and recalibrating etc.

Though it’s not a cure all potion, this is why I use the diesel Millers additive permanently, as it adds lubrication for the fuel pump, helps keep any diesel bug under control and keeps fuel components clean as much as you could hope.
There is still the risk, of contaminated fuel, but that’s sadly not anything that we can do anything about.

I have read before in diesel magazines, engine techs when dismantling an engine with high miles found that components were in really good condition compared to without using it.
I would imagine it helps counter the effects of the bio percentage too.

Going a bit off on a tangent here, I know but it always pays to learn these things, not just tech knowledge but H&S details as well along with it.
Post #1050822 5th Nov 2024 5:13pm
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Waka56



Member Since: 08 Nov 2023
Location: Hamburg
Posts: 158
Germany 
I know that not everyone likes rebuilt injectors, but that's what I went for. Directly after swap and relearn the engine was as smooth as it gets, but after 5-6k a slight injector rattle came back, wondering if that could be VCV related, can't wait to get it running again and check it out. Pretty sure I got some bad diesel when I nearly reach the bottom of the tank 3-4k km ago, right before the rattle came back. Making my Defender great again. (Or trying to at least xD)
Post #1050825 5th Nov 2024 5:34pm
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Waka56



Member Since: 08 Nov 2023
Location: Hamburg
Posts: 158
Germany 
So vcv changed. Good news is, the car started.. but I don't know if it started because I insisted more than the other times or not.. managed to start it 3-4 times, but always stalls again after, can't keep it on even if revving. Idle does not sound good. Might put some new diesel as I am in the last quarter.

Edit: I put the battery on charge, I'll check some more later. Making my Defender great again. (Or trying to at least xD)
Post #1050881 6th Nov 2024 10:45am
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Ianh



Member Since: 17 Sep 2018
Location: Essex
Posts: 1972
United Kingdom 
Poor fuel, fuel contamination and water can all contribute to the failing of a 2.4 VCV.
So When did you last change or drain your fuel filter ? I’m wondering if it’s blocked or if there is water in it.
Post #1050884 6th Nov 2024 11:04am
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Waka56



Member Since: 08 Nov 2023
Location: Hamburg
Posts: 158
Germany 
Filter is 10 months old, 8.000kms. I have not drained it once, I'll do it later, what's the procedure?

Edit: seems quite easy to drain. Do I need to top up the filter afterwards or the fuel will be replaced automatically?

I don't see water inside, the fuel is not 100% clean but I'll have to do it again, could come from the drain itself.

I ordered a new diesel filter that should arrive tomorrow.

I‘ll change the Filter, add some fresh diesel and then check the under the sit relays again. If I can I‘ll also delete all DTCs and then start fresh. Making my Defender great again. (Or trying to at least xD)
Post #1050888 6th Nov 2024 11:27am
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