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lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3315

Idle speed D250

To anybody with a D250 what RPM does yours idle at?

l am sure mine has gone up, it's now just under 750 rpm and l am sure it was nearer 650rpm before.

31st Jul 2025 6:19pm

J77

Member Since: 04 Nov 2019
Location: Fife
Posts: 3490

Mine tends to go up slightly on hot days. 24MY 90 D250 HSE, Tasman Blue

31st Jul 2025 6:45pm

Snipperty

Member Since: 16 Mar 2024
Location: Manchester
Posts: 5

I’ve found in mine it depends on the state of the battery and when it’s doing a refresh of the diesel particulate filter. Noticed it tends to idle at a slightly higher rpm if I’ve done several short journeys, suspect that’s related to charging the battery.

2nd Aug 2025 5:04pm

XplusYplusZ

Member Since: 16 Aug 2021
Location: UK
Posts: 545

Today I noticed mine idling a little higher/louder than usual at a traffic light..
Coincidence - or was there a recent OTA update?

4th Aug 2025 11:16am

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3315

Could be a DPF regeneration taking place?

5th Aug 2025 7:46pm

Landy240

Member Since: 22 Jul 2024
Location: Merseyside
Posts: 27

I have a D250.

It's hard to be absolutely exact but I would say idle is around 625rpm. Halfway between the 500 and 750 marker on the digital dial.

This is with stop/start activated so obviously no regeneration or similar taking place. I bought the car new just over a year ago and it hasn't changed at all.

6th Aug 2025 7:50pm

Landy240

Member Since: 22 Jul 2024
Location: Merseyside
Posts: 27

If it helps, regeneration is just under 1000rpm iirc

Services (aircon etc) will push the revs up a bit.

6th Aug 2025 8:17pm

lightning

Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3315

Landy240 wrote:
I have a D250.

It's hard to be absolutely exact but I would say idle is around 625rpm. Halfway between the 500 and 750 marker on the digital dial.

This is with stop/start activated so obviously no regeneration or similar taking place. I bought the car new just over a year ago and it hasn't changed at all.

Yes mine was always there but it's risen to around 700rpm
l don't suppose it really matters, that the idle speed has risen by 60rpm, but l did notice the change.

That's with nothing turned on and the stop/start turned off. Although turning things on makes no difference.

l wonder if the battery is deteriorating. l've read that some people have needed a battery replacement after as little as two years.

6th Aug 2025 10:41pm

haymeister

Member Since: 24 May 2021
Location: Saitama
Posts: 283

Mine's a D300. With summer in Tokyo my idle speed in Drive has gone up by ~100rpm from 650 to 750rpm
In Park it rises to 950 rpm.
Outside temp indicated at 37 degrees on the dash. Aircon set to 22 degrees.
Coming up to my 4th year. At my 3rd year service they told me to replace the battery next year but no starting nor electrical issues (yet....) 22MY Defender 110 D300 S in Pangea Green and Contrast White Roof
IG defender_japan "Hulk san"

7th Aug 2025 3:22am

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