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MAC110



Member Since: 18 Nov 2017
Location: Wiltshire
Posts: 3
United Kingdom 2011 Defender 110 Puma 2.4 HT Keswick Green
Intermittent no power at low revs
Right .. apologies for first post being a mechanical query .. but I have an issue on my new beloved defender and one month of a dealer warranty left (and i want an idea of what has gone wrong when they try and get out of covering it) .. so..

Vehicle is a 2011 TDCi 2.4.

It has been perfect for two months but the following has started creeping in .. usually at stand still, the revs will drop low for a second or two, apparently randomly .. it doesn't stall .. but during this time the accelerator pedal appears to do nothing (only happened handful of times so hard to tell).

Today it happened when going round a slow (5mph) corner and pretty much drifted to a halt before it went away and carried on. Not ideal!

While I get busy learning the engine systems .. can anyone provide any hints? I'm guessing fuel delivery since it doesnt stall and appears to loose all power (not partial).

Any assistance or ideas to troubleshoot very appreciated.

Thanks, MAC
Post #665410 18th Nov 2017 11:10pm
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meeerrrk



Member Since: 12 Feb 2017
Location: Surrey
Posts: 548
United Kingdom 2010 Defender 90 Puma 2.4 HT Stornoway Grey
Im no expert but recently Ive read a lot on the VCV valve, its function and failure symptoms.

Yours sure sounds to me like it fits one of those suspected symptoms- have a search on the forum and read up on it, see if you agree. My 90 Project : http://www.defender2.net/forum/topic52774.html
Post #665412 18th Nov 2017 11:25pm
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MAC110



Member Since: 18 Nov 2017
Location: Wiltshire
Posts: 3
United Kingdom 2011 Defender 110 Puma 2.4 HT Keswick Green
Thanks for your reply .. looks like a likely suspect after a quick search around.

Just to add that outside the idle power drops .. it is fine .. I've not experienced any issues at speed or higher revs etc. Yet. I also don't get any fluctuations or chattering that others report.

Fairly sure they aren't temperature dependant either as pretty cold in UK at the moment and it occured after maybe 10 minutes driving.

It's apparently just been serviced by the dealer before I bought it too and have probably only done ~500 miles in it since as been in Cuba for 3 weeks (will post photos of Cuban defenders soon!)
Post #665423 19th Nov 2017 12:07am
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19531
United Kingdom 
Do you have an active EGR Valve? 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 #665430 19th Nov 2017 1:00am
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MAC110



Member Since: 18 Nov 2017
Location: Wiltshire
Posts: 3
United Kingdom 2011 Defender 110 Puma 2.4 HT Keswick Green
Sorry for delay - active EGR valve is a good question - since an EGR fault flagged up under diagnostics.

It's been cleaned and lubricated and the problem seems ok for now .. but will take a look into EGR blanking plates. I'm sure there are many threads on them already.

Happy days if that was all it was! Thanks for your advice.
Post #666566 23rd Nov 2017 11:17pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19531
United Kingdom 
The EGR can put MAF readings out if any issues present which can in turn drastically effect performance in random ways. 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 #666573 23rd Nov 2017 11:47pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16857
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
custom90steve wrote:
Do you have an active EGR Valve?


That sounds like something your GP might diagnose! "I'm afraid it's bad news, Mr McGovern, you have an active EGR valve"

The power loss problem could well be VCV.
Post #666574 23rd Nov 2017 11:47pm
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