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jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

2011 Defender 110 Puma 2.4 USW Stornoway Grey

2.4 2011 power loss, I know another thread.

Grateful for any views please.

Initial loss of power after a period of mixed driving.

First two instances it happened were off a specific roundabout 16 miles into a journey. Power drops under acceleration.

Power loss and max revs of 2000rpm.

After a few seconds, 2 or so power comes back.

Now happening more frequently when into a longer journey.

Power loss initially occurring after being on a heavier power demand, ie pulling off a roundabout, after a hill climb.

Now seems to occur at any point and takes longer to sort. 30 to 50 seconds

I have tried the following to help restore power quicker.
1. Blipping accelerator, whilst scan gauge shows load and gph changes it has no impact on fuel delivery.
2. Cycling ignition makes no difference.
3. Multiple clutch presses no difference
4. Swapped in known working MAF no difference.
5. Closed loop bypass clutch switch no difference
6. When power has been lost if dip clutch and blip accelerator there is no increase in fuel delivery ie no rev change, it drops to a lumpy idle.
7. If turn ignition off and restart when there is lack of power there is lumpy idle for few seconds.

Only bas tool and scan gauge available. No fault codes shown.

Engine temp is normal 74 to 85 degrees when it occurs.

VCV changed 5k miles ago

Vehicle used almost daily, filter changed 3k miles ago

As of today occurred 5 or 6 times 20 miles into a journey.

As of today you can feel a power drop about to happen when on lower accelerator demand with a slight hesitation from the vehicle.

Initially keeping accelerator pedal all the way down when it occurs seemed to restore power quicker.

Yet to test if leaving the vehicle for a period after occurrence will help.

Makes max boost pressures. No intercooler or turbo linkage concerns or changes turbo wires.

What do we think?

Vcv? Cheers

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

12th Nov 2022 9:53am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19579

Sticky turbo vanes or actuator, on mine the actuator sticking caused such behaviour.
Though does put on a DTC but not always.

Effectively causes limp mode.

VCV going usually fuses stalking at low speed, rough cold idle and reduced top end power I.E. in 6th.

EGR can cause some strange issues, as can the clutch switch though the latter usually is gear change associated. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

12th Nov 2022 12:59pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

Egr gone
Clutch switch bypassed and still does it.
Turbo was initial thought but it is boosting and boost pressure bchanges as expected. Actuator is free moving no resistance.

Fault occurs at intermittent times on boost, off boost too.

Idle is erratic if cycle ignition as fault occurring. Ie fueling is not correct at that moment.

Also gives no throttle response when fault occurring as in although throttle position read out shows input is applied there is no corresponding change in actually fueling from what I can see.

Vanes is on agenda to look at. Cheers

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

12th Nov 2022 4:02pm

Grenadier

Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5765

2011 Defender 110 Puma 2.4 DCPU Corris Grey

Maybe your VCV has failed earlier than you’d wish for? It does sound very VCVy. If that’s a word? Identical problems to mine before my swap. The fact they’re known to fail frequently, clearly makes them fallible. And therefore no reason why one should last 50,000k as much as 5,000k…. Monsieur Le Grenadier

I've not been everywhere, but it's on my list.....

2011 Puma 110DC - Corris Grey

12th Nov 2022 6:37pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19579

Check the turbo hose hasn’t been rubbing on the steering column too, a common one but not easy to notice. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

12th Nov 2022 8:29pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

Hoses are good externally.

Other thoughts I had were pressuring fuel tank, maybe pressure relief valve being faulty? Cheers

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

13th Nov 2022 12:06am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 16884

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Sounds very much like VCV to me.

13th Nov 2022 8:21am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19579

The annoying part it seems about the VCV’s is some may last years, my last one was about 12yrs old!
Others seem to not last a few years.

But equally, are we ending up with unknown contaminated fuel with water in?

I know for a fact that when mine gave up the ghost it was just after I used an independent fuel station that I’ve never used before.
I’m damn sure there was water in the fuel, it was too coincidental. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

13th Nov 2022 1:49pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 16884

Water in the fuel will kill a VCV in seconds.

13th Nov 2022 1:59pm

Bluericky

Member Since: 26 Jun 2014
Location: Cornwall
Posts: 647

2009 Defender 110 Puma 2.4 DCPU Keswick Green

This is exactly what I experienced and had recently changed the VCV .
After a lot of wasted time and money, I eventually exchanged the VCV and the problems vanished.
Both were from PF Jones https://www.instagram.com/hustynminepark/

13th Nov 2022 4:04pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19579

PF Jones was where I got my replacement from too, no programming needed and been right as rain ever since.
It was surprising what power came back too!

But yes, I think water in fuel is what does it. Even a little, and the coincidence of the fuel station and it happening within a day or two… Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

13th Nov 2022 5:26pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

Bluericky wrote:
This is exactly what I experienced and had recently changed the VCV .
After a lot of wasted time and money, I eventually exchanged the VCV and the problems vanished.
Both were from PF Jones

That sounds promising.

So your first replacement vcv gave up soon after fitting and another then fitted solved it? Cheers

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

13th Nov 2022 9:34pm

hank

Member Since: 12 Sep 2016
Location: South Wales
Posts: 2231

Recently had similar sounding symptoms and spend nearly a grand replacing all sorts. My VCV was less than a year old so I assumed it could not be that.

In the end I replaced the VCV again and normal running was restored > 110 XS Double Cab
> Instagram @simonlanemind

13th Nov 2022 9:42pm

Bluericky

Member Since: 26 Jun 2014
Location: Cornwall
Posts: 647

Hi JST

Yes it was probably in for 6 months or so. I also changed the fuel filter at the same time as that seemed logical.
The symptoms have gone but now I have another gremlin where my puma has started cutting out when idling . Then sounds a little rough on restart for a second or two.
I’m not sure if it’s related .
Anyhow the VCV swap eliminated the intermittent lack of power and lack of throttle response https://www.instagram.com/hustynminepark/

13th Nov 2022 11:05pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

Vcv ordered! Can't wait to change that again! Cheers

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

14th Nov 2022 5:45pm

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