Member Since: 16 Jun 2015
Location: Norwich
Posts: 6
District change of engine note at idle.
Just collected a new wagon. At idle it's as expected. At least for a few minutes.
Once the vehicle has run for a few minutes the engine note deepens - as if a valve in the exhaust has opened.
Anyone else experienced this?
Thanks.
16th Jun 2015 9:10 pm
motolite
Member Since: 18 Mar 2013
Location: Sydney
Posts: 931
Hi BenB and welcome. I hadn't noticed that, but probably drowned out by my dashboard rattles
16th Jun 2015 10:05 pm
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774
Could be the DPF doing a regenerate sequence. It does sound a bit gruff when it does it. How many miles on it?
16th Jun 2015 10:07 pm
motolite
Member Since: 18 Mar 2013
Location: Sydney
Posts: 931
Gareth, do they regenerate at idle?
16th Jun 2015 10:13 pm
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774
Yes. Most of the time I can hear it start whilst I am driving, the engine note changes distinctly at low revs. If I stop, the idle is rough. If you are at motorway speeds, I don't notice any difference, but I suspect it regenerates a lot quicker at speed.
16th Jun 2015 10:18 pm
motolite
Member Since: 18 Mar 2013
Location: Sydney
Posts: 931
I thought the rough idle was just another quirk of the Disco
Gareth, 4 weeks and counting until WA
16th Jun 2015 10:27 pm
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774
Well Tim, after Del's real-time write up of his North Norway trip, you have a tough act to follow! I know you will have a great adventure.
16th Jun 2015 10:33 pm
BenB
Member Since: 16 Jun 2015
Location: Norwich
Posts: 6
Gareth wrote:
How many miles on it?
About 6........
17th Jun 2015 7:10 am
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774
Well put a few on it, and see if it changes.
17th Jun 2015 7:11 am
Sloss
Member Since: 18 Aug 2013
Location: Aberdeenish
Posts: 1691
You guys need to read up on DPF regeneration.....
It doesn't happen at idle, needs to see steady speed for x minutes etc., etc.Stew,
2010 D4 gone but I really loved it
Went back to Merc - C350 AMG
17th Jun 2015 7:20 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Yep in no way will the DPF be regenerating at idle.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 10 Jun 2014
Location: Cambridgeshire
Posts: 498
Yes I have noticed exactly the same thing with my Disco. No idea what it is tho !!Velar MY18 D180 S Narvik
Discovery MY2015 3.0 SDV6 SE Corris - Gone
17th Jun 2015 4:40 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
There is loads going when the vehicle is warming up. The fuelling strategy is different, the injectors are over-providing, the glow plugs are in their continuous afterglow mode, the DPF is warming up, as is the cat and the EGRs will get in on the act too.Land Rover - Turning Drivers into Mechanics Since 1948
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Gareth, 4 weeks and counting until WA 
