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Coze

Member Since: 14 Oct 2020
Location: Scotland
Posts: 3

Loss of power.

My Defender Puma 2.4 sometimes when driving all of a sudden loses power, and will slow right down, due to lack of power. When you stop, the engine continues to run. I switch the ignition off, then restart the engine and the engine runs on full power again, so turning off the ignition and starting again is effectively resetting something. Does anyone have any idea what is causing this, or experienced a similar fault.
Thanks. Forgot to mention there is no engine management light activation, so no fault codes.

14th Oct 2020 6:53pm

williamthedog

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

Have a look at the posts about the vcv valve on here.

Sounds suspect.

14th Oct 2020 7:04pm

Coze

Member Since: 14 Oct 2020
Location: Scotland
Posts: 3

I replaced the vcv valve last year, as the defenders idle speed was very erratic, replacing this valve solved the idle speed problem.

14th Oct 2020 7:14pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17876

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

The first thing to do is check what if and DTCs are stored in the ECU, otherwise it's just guesswork.

14th Oct 2020 7:25pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8341

2011 Defender 110 Puma 2.4 USW Stornoway Grey

As above check codes.

What conditions does it occur under? Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

14th Oct 2020 7:28pm

Stacey007

Member Since: 25 Sep 2015
Location: Cheshire
Posts: 3854

Mine did this just randomly lost power,

No fault codes, nothing, all dials go off then sometimes would restart on its own other times I restart it.

Could do it 3 times in a 20 mile trip or once in 3 months...

Mine was a new ignition barrel. Changed this and no issues since

14th Oct 2020 7:47pm

Coze

Member Since: 14 Oct 2020
Location: Scotland
Posts: 3

What conditions : Normal driving, happens randomly can be over a month and no issues, then twice in a week, dealership hopeless as no fault codes therefore not interested. I am completely bamboozled, as it goes like a train after you have stopped at the side of the road and restarted it.

14th Oct 2020 9:02pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11327

Stacey007's reply above has identified a very likely culprit. Fiddly to fix but not expensive. 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

14th Oct 2020 9:21pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20919

Grounding points being loose and or battery clamps is another possibility, an easy enough thing to check at least and free.

Ideally some Dielectric grease too, and checking all main HD fuses are secure.
MAF and Map sensors are clean, and maybe even the alternator live stud too.
The electrical side can have a significant impact on the performance due to the fuelling system ECU etc.

I expect the above posts maybe very possible and likely even to be the issue. But the things I’ve suggested are worth checking just in case and won’t cost anything.

Take a look at the air filter too. ____\We|Will|Win/___
____/🇬🇧🇺🇸\____
_//*⛽️🛢️⚙️🧰*\\_

14th Oct 2020 10:33pm

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