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boxoftricks



Member Since: 06 Feb 2019
Location: Home Counties
Posts: 580

United Kingdom 2011 Defender 110 Puma 2.4 USW Zermatt Silver
Loss of Power - VGV question

2.4 Tdci, 120,000 miles.

Twice now a month or so apart having come off the dual carriageway and around a few roundabouts I've lost a lot of power. Throttle flat to the floor, 3500 revs and no torque. Struggling up the hills. Thought turbo may be playing up but no strange noises, no split hoses etc.

Had a nose around on here and I think it may be the VCV? No warning light bringing up a fault code.

Is the VCV the logical place to start?

If it is, is it best to go for genuine or are aftermarket ok? Is there any real difference?

Thanks

Post #895768 3rd Apr 2021 4:53pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 18255

United Kingdom 

Yes, do you know how old it is?

It would be useful to plug it in to check for any fault codes. (DTC’s).

Bearing in mind the VCV doesn’t produce any but MAF and other items do.

Might be worth cleaning the MAP and MAF sensors too.

I got my VCV from PF Jones diesel specialist, the part fits various models mine came in a Nissan genuine box.
The part was brand new, fitted and really good.
The biggest different you’ll notice is high end power restored.

You are probably getting some fuel starvation at higher speeds hence the issues you’ve had.
It will get worse and can just cut right out, especially dangerous at junctions and roundabouts as this happened to me twice.

No programming required once fitted, however, I would recommend to disconnect battery first before working on it which is good practice.

There is a two stage tightening process of the fixings in the WSM with torque settings if you can get that, or it’s may be on here or it can be looked up for you.
If you would like to not do that or you don’t have the tools. Just don’t over tighten, they are just nipped up.
Not loose, but don’t over tighten tighten.
Just secured.

IIRC is was 8nm max possibly 6nm, but don’t quote me on that, it’s a relatively simple job and the electrical connector is best removed once the part is removed for ease of access.

Worth having a bit of paper / kitchen towel and disposable gloves if you have any lying around too.

I find mine is running very sweet now, full power is restored and you will notice the difference. Thumbs Up Diesels Lives Matter

Post #895774 3rd Apr 2021 5:50pm
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boxoftricks



Member Since: 06 Feb 2019
Location: Home Counties
Posts: 580

United Kingdom 2011 Defender 110 Puma 2.4 USW Zermatt Silver

Thanks Steve

Post #895788 3rd Apr 2021 8:48pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7016

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Don't rule out turbo. Does it reset with an ignition cycle? Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

Post #895809 3rd Apr 2021 11:48pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 18255

United Kingdom 

James is right above, so worth doing some checks but seeing as the VCV is relatively cheap it’s worth doing and can then be ruled out if it isn’t the issue in the end.

Good luck. Thumbs Up Diesels Lives Matter

Post #895928 4th Apr 2021 8:46pm
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boxoftricks



Member Since: 06 Feb 2019
Location: Home Counties
Posts: 580

United Kingdom 2011 Defender 110 Puma 2.4 USW Zermatt Silver

jst wrote:
Don't rule out turbo. Does it reset with an ignition cycle?


Yes re-sets its self with the ignition cycle so think its temp related, not thankfully the turbo

Post #896251 6th Apr 2021 5:45pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7016

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Does it always happen after coming off boost only? Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

Post #896317 6th Apr 2021 9:09pm
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CharlieDonuts



Member Since: 16 Jun 2019
Location: Illiers Combray
Posts: 118

France 2008 Defender 90 Puma 2.4 SW Galway Green

I have the same problem. It only happens rarely. Temporary fix is to switch the ignition off and on again. So I am following with some interest.

Post #896414 7th Apr 2021 10:21am
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BIMbound



Member Since: 09 Jan 2021
Location: UK
Posts: 15

Similar problem here, same engine, same mileage. I think mine is turbo related as when the power goes there is no longer that distinctive whistle from the turbo. Engine off and cool down - off we go again.

Post #896448 7th Apr 2021 12:57pm
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boxoftricks



Member Since: 06 Feb 2019
Location: Home Counties
Posts: 580

United Kingdom 2011 Defender 110 Puma 2.4 USW Zermatt Silver

I've spoken to the guys at Bass tuning and need to wait until it happens again and plug in the code reader before turning off the ignition. Will keep you posted

Post #896467 7th Apr 2021 2:04pm
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Minch90



Member Since: 15 Sep 2017
Location: Gloucestershire
Posts: 140

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Blenheim Silver

My fix was - new fuel filter (full of crap, so fixed breather pipe first), foamy turbo cleaner thru turbo and a new vcv. No probs since, and was occurring every few days beforehand. Prob belt and braces but covered all bases for me 👍 2.4TDCI 90 - everyday brilliance
S3 V8 Lightweight - in the garage being ignored #newchassistime
S3 lightweight - 2nd car 24V fire risk with a full tilt and the windscreen down
S1 80" - first car fun - 75mph in neutral downhill once #wobblesallround

Post #896475 7th Apr 2021 2:34pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7016

2011 Defender 110 Puma 2.4 USW Stornoway Grey

i have had the fuel tank breather issue, but that cures itself once you have slowed down and some air has made its way into the tank then it goes again.

i think you have a turbo overboost register issue which is going to limp mode, assuming it does it after a longish session on full load/boost.

try holding it under full boost for 5 to 10s, ie uphill on a motorway and see if it does it. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

Post #896539 7th Apr 2021 8:09pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 18255

United Kingdom 

Is the actuator operating smoothly too? Diesels Lives Matter

Post #896560 7th Apr 2021 9:16pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7016

2011 Defender 110 Puma 2.4 USW Stornoway Grey

^^^ i expect it is moving but not responding quick enough when coming off power and pressure ouput correlation is lost. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

Post #896561 7th Apr 2021 9:21pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 18255

United Kingdom 

That makes lot of sense. Thumbs Up I tend to put a drip or two of oil on mine (turbo actuator) every once in a while. Like 3in1 oil in a dropper bottle.
Only very little though for obvious reasons and seems to keep mine in good order. Diesels Lives Matter

Post #896563 7th Apr 2021 9:46pm
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