↓ Advertise on Defender2 ↓

Home > Puma (Tdci) > Lack of Power
Post Reply  Down to end
Page 1 of 1
Print this entire topic · 
TheBigHess



Member Since: 07 Jan 2024
Location: Oxford
Posts: 6

United Kingdom 2011 Defender 110 Puma 2.4 XS CSW Santorini Black
Lack of Power
Hi there,

Looking for some advice car drives and all but struggle after I hit about 30mph. Have checks MAF and MAP sensors all are good air filter has been checked as well no issues there. Have also checked that the brakes aren’t sticking. I’m a bit lost with what to do next and looking for any help and advice. Car used to drive fine no issues and now it seems to be lacking power and torque. No engine lights or fault codes. Struggles to go over 55mph and struggles bad up gentle hills.

Thanks in advance!
Post #1027662 11th Mar 2024 6:31pm
View user's profile Send private message View poster's gallery Reply with quote
blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16808

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Sounds like that old favourite, the VCV.
Post #1027664 11th Mar 2024 6:42pm
View user's profile Send private message View poster's gallery Reply with quote
Ianh



Member Since: 17 Sep 2018
Location: Essex
Posts: 1694

United Kingdom 
As per BW in this topic and nicolas0505 and custom90steve highlighted in the other topic you raised, https://www.defender2.net/forum/topic90678.html the VCV is the likely culprit if you have a 2.4
Post #1027668 11th Mar 2024 7:10pm
View user's profile Send private message View poster's gallery Reply with quote
TheBigHess



Member Since: 07 Jan 2024
Location: Oxford
Posts: 6

United Kingdom 2011 Defender 110 Puma 2.4 XS CSW Santorini Black
This previous issue was solved and car was running well for about a month or 2 and then recelenty had this new issue arise are we still thinking the VCV?
Post #1027673 11th Mar 2024 7:25pm
View user's profile Send private message View poster's gallery Reply with quote
custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19449

United Kingdom 
It could be that the VCV isn’t any good, unfortunately some of them are re-worked / refurb but passed off as new.
Where did yours come from? Diesels Lives Matter. ⛽️🛢️👨‍🔧🧰⚙️
And if You Love the Country, then we’re on the same side ~
I got’ love for Britain, I got’ British pride’. 🇬🇧
Post #1027678 11th Mar 2024 7:39pm
View user's profile Send private message View poster's gallery Reply with quote
Ianh



Member Since: 17 Sep 2018
Location: Essex
Posts: 1694

United Kingdom 
The lack of DTC’s would indicate it’s a VCV if it’s a 2.4. Noting the 2.2 does not have the VCV issues the 2.4 has.
Did you change your VCV on the last fault ? I ask as there are a lot of fake VCV’s being sold and you do need a genuine Denso one else they likely fail again.
Post #1027681 11th Mar 2024 7:42pm
View user's profile Send private message View poster's gallery Reply with quote
TheBigHess



Member Since: 07 Jan 2024
Location: Oxford
Posts: 6

United Kingdom 2011 Defender 110 Puma 2.4 XS CSW Santorini Black
Unfortunately not sure what was replaced to fix the issue before as was with the dealership I purchased off and they still 2 months down the line have not sent me the work that was carried out. Is Denis or OEM better to go for for the VCV?
Post #1027692 11th Mar 2024 8:21pm
View user's profile Send private message View poster's gallery Reply with quote
TheBigHess



Member Since: 07 Jan 2024
Location: Oxford
Posts: 6

United Kingdom 2011 Defender 110 Puma 2.4 XS CSW Santorini Black
VCV replaced issue the same struggle to get over 50mph on the cruise and hills are a struggle still. Any ideas?
Post #1028332 17th Mar 2024 9:40am
View user's profile Send private message View poster's gallery Reply with quote
jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7664

2011 Defender 110 Puma 2.4 USW Stornoway Grey
whats it boosting too? Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #1028334 17th Mar 2024 10:14am
View user's profile Send private message View poster's gallery Reply with quote
andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 199

United Kingdom 2014 Defender 110 Puma 2.2 CSW Aintree Green
not experienced your symptoms but from reading bits and pieces , I believe the accelerator pedal position sensors can cause a loss of power beyond the first quarter or so of the accelerator pedal movement if one of the tracks fails...so would be worth checking that..
and if the fuel temp sensor was faulty that would also restrict power as it might be spilling more fuel into the return line rather than feeding the hp pump..
have you checked the fuel rail pressures to see what they are doing as you operate the accelerator ...
Post #1028345 17th Mar 2024 1:06pm
View user's profile Send private message View poster's gallery Reply with quote
custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19449

United Kingdom 
Throttle or turbo actuation issues, likely the latter. Mine was way better after freeing up the vanes manually and regular light lube.
DTC’s often give clues, with the exception of the VCV. Diesels Lives Matter. ⛽️🛢️👨‍🔧🧰⚙️
And if You Love the Country, then we’re on the same side ~
I got’ love for Britain, I got’ British pride’. 🇬🇧


Last edited by custom90 on 17th Mar 2024 4:01pm. Edited 1 time in total
Post #1028350 17th Mar 2024 2:03pm
View user's profile Send private message View poster's gallery Reply with quote
andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 199

United Kingdom 2014 Defender 110 Puma 2.2 CSW Aintree Green
Been meaning to ask before and this thread seems as good a place as any given the subject...
Everyone is saying vcv valves can play up and cause issues.. Has anyone put a scope across one and run it in conjunction with a fuel rail pressure trace..
Or does anyone know what sort of trace to expect. Ie analogue or digital.. Voltage etc..
I have thought about it and will get round to it, but someone may have good examples they can share..
Post #1028360 17th Mar 2024 3:38pm
View user's profile Send private message View poster's gallery Reply with quote
custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19449

United Kingdom 
I believe it’s usually mechanical failure with the VCV rather than electrical issues, such as wear and scoring.
I would imagine electrical parameters are fine, so possibly difficult to tell based upon that.
As Blackwolf on here has mentioned before, water traces in fuel can do a lot of damage and kill a VCV.

Something like the CHT Sensor is easy to tell though and that’s resistance tests in KOhms. (kΩ).
On a table along with ambient temp.

When I took my old one (VCV) off, Blackwolf was correct there was wear in the bore IIRC and some scuffing and scoring.
The signs were more fuel used (less pronounced issue) and a rough idle (hardly noticed but noticed a lot more in temps below 5.C.)
Lack of top end power, and harder acceleration required than normal.
Having to drop down from 6th to 5th on a light incline with no load I.e. no trailer is a common factor.
Lack of power much more pronounced in 5th and 6th gear.
Then eventually randomly stalling on idle or when cold, less likely when cold but randomly stalling but restarting again.
Eventually the stalling becomes much more common, and any signs of that replace VCV as it can cut out in a dangerous situation such as just pulling out of s junction or joining a roundabout.

The lack of power in higher gears can go on for a while and poor idle etc, but the stalling is a more immediate impeding sign which was when I changed mine.

I would imagine good tuners can spot the signs via their diagnostics systems, this is something Pete @ BAS or Gary @ Alive would know more of.
I’d imagine there is parameters in the ECU live diagnostics that show this and is easier to look at than testing with say a multimeter in this instance.

A drop on torque and hp probably is a sign anyway in higher speeds on a rollling road, especially when looking at the torque and hp curve on a graph vs standard parameters. Diesels Lives Matter. ⛽️🛢️👨‍🔧🧰⚙️
And if You Love the Country, then we’re on the same side ~
I got’ love for Britain, I got’ British pride’. 🇬🇧
Post #1028361 17th Mar 2024 4:15pm
View user's profile Send private message View poster's gallery Reply with quote
andy63



Member Since: 30 Jun 2023
Location: north east
Posts: 199

United Kingdom 2014 Defender 110 Puma 2.2 CSW Aintree Green
I get what you are saying, but the symptoms you refer to like loss of power / torque etc would be down to a fueling issue as we are talking about a vcv..or thats the way I see it... so the vcv mechanical issues are causing that... it may well be responding to demand in terms of the expected electrical response , but its mechanical inability to do its job has to have an effect and produce said symptoms, so if you have a good example as a scope trace of the vcv and the fuel rail pressure , then if its faulty mechanically it should be evident on the trace when compared to one that is known to be good, if you follow what im trying to get at.... bit like the mass air flow meter... a known good trace should be capable of showing up a failure in the sensor if it malfunctions electrically or the air flow is impeded mechanically..
Post #1028365 17th Mar 2024 4:38pm
View user's profile Send private message View poster's gallery Post Reply
Post Reply  Back to top
Page 1 of 1
All times are GMT

Jump to  
Previous Topic | Next Topic >
Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
DEFENDER2.NET RSS Feed - All Forums