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Grenadier



Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5829

France 2011 Defender 110 Puma 2.4 DCPU Corris Grey
TDCI 2.4 Power Drop
Morning all. I think my post is about a well covered subject, and indeed I have searched for answers on-line, but it is very muddled and I am therefore keen to tap into the oracle that is the combined intellect of the Def2 forum’s membership.

I have suffered a loss of power in the DCPU over recent days. Nearly all occasions have been identical: After driving for a while without problem, i head up hill at a steady pace before eventually needing to drop a gear either due to a junction or extra steepness in the hill. At the point I drop gear and accelerate, there’s a sudden (but not complete) loss of power. First time it happened, felt like a fuel feed block/failure. I drive slowly for a bit and then it picks up again. It has happened five times since I picked her up from Palma last week, the first being during the drive home on Thurs night. All occasions have been almost identical. Hill, drop gear, reaccelerate.

Facts worth knowing:

60k on the clock
Never ever happened before in 18mths of ownership
Engine Management light is ON. Not had a chance to read fault codes.
Cleaned MAF Sensor before my Palma trip. Has done approx 1500 KMs since.
External Air Temp has been ‘normal’. Max 25c.
All occasions have been on hills driving at normal speed, revs around 2500
When the DCPU had its output shaft replaced in Palma, I slipped in a new Fuel Filter as well (cause?)

I have heard of the following reasons:

Dirty fuel filter or blocked fuel line.
Misreading airtemp gauge in airbox
Dodgy MAF sensor
Blocked Intercooler
Leaking Intercooler
Split hoses
Failed Turbo actuator
Failed Turbo

I know others have had similar experiences, can anyone point me in the logical order to check things. I appreciate the first will be the Fault Codes which I hope to do tomorrow. I shall give the MAF sensor a clean this morning, check the airbox and ensure the Intercooler is clean and clear of crud. I will externally inspect the Turbo for any signs of wear, damage, and pipes for leaks etc.

Will keep all posted, but any initial thoughts welcome. Thumbs Up Monsieur Le Grenadier

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

2011 Puma 110DC - Corris Grey
Post #725985 29th Aug 2018 6:10am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17450

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
VCV
Post #725994 29th Aug 2018 7:12am
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Grenadier



Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5829

France 2011 Defender 110 Puma 2.4 DCPU Corris Grey
Thanks BW. Easily recitified? Cheap/expensive? DIY/Garage? Monsieur Le Grenadier

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

2011 Puma 110DC - Corris Grey
Post #726015 29th Aug 2018 8:03am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17450

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
It is not guaranteed that it is the VCV but the VCV can cause all manner of fuel related issues. Failing to respond correctly to a sudden change in fuel demand is a classic symptom.

Changing it is in principle simple, but access is very restricted especially if you have large hands. I have changed several and it is fiddly, but can be done. Others have opted to remove the inlet manifold to facilitate access.

Once changed a pump relearn cycle using a diagnostic tool is recommended but not essential, generally the vehicle will ruin better with a good VCV and no relearn than with a faulty VCV. Given enough time the ECM will relearn the pump characteristics anyway, but a DTC for "pump relearn not performed" will come back several times.

The last VCV I bought was from Ford and was about £80, I am not sure how much they are now. If you have a suitable diagnostic tool the whole job including relearn can easily be done in an hour. Changing the VCV takes about 10 minutes, most of which is spent swearing.
Post #726026 29th Aug 2018 9:20am
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Grenadier



Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5829

France 2011 Defender 110 Puma 2.4 DCPU Corris Grey
Thanks BW, will get the fault readings done tomorrow and make a plan. Sounds like a sensible fix anyway for a 60k engine. (BTW, good advice on the clutch change when I did the outpt shaft, no more than a few hundred miles left in it).

As an update, cleaned the MAF, drove to work. I kept the revs steady and pre-planned gear changes. Main uphill stretch is 14km dual carriageway at an average of 5-7%, which I travelled at 90-95kmh, 1800-2000rpm. No slump in power. Heading home at midday, which includes a shorter, sharper and steeper hill of 3kms just before home. Will update. Thumbs Up Monsieur Le Grenadier

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

2011 Puma 110DC - Corris Grey
Post #726032 29th Aug 2018 9:41am
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agentmulder



Member Since: 16 Apr 2016
Location: Outer Space
Posts: 1324

Kuwait 
blackwolf wrote:
...most of which is spent swearing.


Concur Rolling Eyes Solved the bowel problem, working on the consonants...
Post #726047 29th Aug 2018 11:16am
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shropshiredefender



Member Since: 05 Jun 2017
Location: Shropshire
Posts: 834

England 2011 Defender 110 Puma 2.4 USW Santorini Black
Based on personal experience Blackwolf is almost certainly right - VCV.
It is worth checking the coolant level because if the Cylinder Head Temperature Sensor detects overheat it will cut engine power momentarily. The CHT will react before the temp gauge moves and it does feel like a fuel related issue.
Be lucky Thumbs Up
Post #726050 29th Aug 2018 11:54am
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Grenadier



Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5829

France 2011 Defender 110 Puma 2.4 DCPU Corris Grey
Is this what we're talking about?

https://www.firstfour.co.uk/vacuum-pump-fo...i-oem.html Monsieur Le Grenadier

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

2011 Puma 110DC - Corris Grey
Post #726052 29th Aug 2018 12:17pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
No, that's a vacuum pump. You're looking for a Volume Control Valve (VCV).


Click image to enlarge
 Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #726056 29th Aug 2018 12:27pm
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Grenadier



Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5829

France 2011 Defender 110 Puma 2.4 DCPU Corris Grey
Ta. Thumbs Up Monsieur Le Grenadier

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

2011 Puma 110DC - Corris Grey
Post #726058 29th Aug 2018 12:42pm
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o4dn



Member Since: 08 Jan 2010
Location: South West
Posts: 545

France 2009 Defender 90 Puma 2.4 SW Alaska White
LandRoverAnorak wrote:
No, that's a vacuum pump. You're looking for a Volume Control Valve (VCV).


Click image to enlarge


Just a bit of warning though, that picture and reference on the box are the VCV for a 2.2 Puma whereas Grenadier's is a 2.4, the VCV differs between the two.

The VCV for a 2.4 Puma should be:

Landrover: LR009837
Ford: 1 514 885 (6C1Q 9358 AB)

I changed mine a couple of months ago, took me a lot more than 10 mins though, it was pain of a job to be honest, maybe it's a easier on a RHD (mine being a LHD), dunno...

On the plus note, the car is working so much better now... “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique.
--
2009 2.4 Puma Defender 90 SW
1979 Land Rover Series 3 88"
Post #726063 29th Aug 2018 1:15pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
Good point. I just pinched it to illustrate how different it is to a vacuum pump! Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #726074 29th Aug 2018 2:21pm
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williamthedog



Member Since: 29 Dec 2012
Location: south wales
Posts: 3441

2011 Defender 90 Puma 2.4 PU Tamar Blue
If it is the vcv valve I found it relatively easy. I unclipped the wiring harness out of the way. Disconnected the vacuum hose out of the way. Unclip the wiring to the vcv when it's off the pump. Thumbs Up
Post #726079 29th Aug 2018 3:18pm
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Hairysteve



Member Since: 15 Jun 2015
Location: Surrey
Posts: 692

United Kingdom 2009 Defender 110 Puma 2.4 XS CSW Barolo Black
Are you by any chance noticing a bakery/pastry/sweet smell in the cabin? I ask because I had your symptoms and this sweet smell of coolant was another symptom and in the end was resolved by the head being skimmed. Sure that with your low mileage it isn't this but worthy of a share.
Post #726126 29th Aug 2018 5:45pm
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Grenadier



Member Since: 23 Jul 2014
Location: The foot of Mont Blanc...
Posts: 5829

France 2011 Defender 110 Puma 2.4 DCPU Corris Grey
Update: Morning commute it happened a number of times in succession along a dual , but on this occasion, every time (three within a couple of clicks) the thermo shot up to full. Pulled over to cool down, then drove at a slower rate on an a-road to Cham. Would the VCV effect the temp or is this possibly more a coolant issue? Will check levels when engine is cold. Thumbs Up Monsieur Le Grenadier

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

2011 Puma 110DC - Corris Grey
Post #726403 31st Aug 2018 8:18am
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