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trebaix
Member Since: 24 Oct 2010
Location: midlands
Posts: 11
  
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Recently swopped my 90,000 mile TDV8 Range Rover for a new 3 litre Disco 4. With my Disco I have had a few random scary incidents pulling out at junctions when I briefly experienced a "power loss". This happened maybe only once a week or so but it was happening and was very disconcerting/dangerous.
I have finally recreated the factors. Light throttle opening at a roundabout or junction while drifing onto it in a stream of traffic at walking pace. A gap appears in front of an approaching 44 ton lorry. I realise that I am rolling just a little too quickly to merge in so I brush the brake, then I put my foot to floor with full throttle and.....no power for a second or so while I roll in front of the lorry. Not good.
I realise that I am triggering some sort of electronic "safety" gizmo and have spoken to my Dealer. if you touch the brake (left foot) while at the same time slightly opening the throttle the electronics shut the engine down to no power.
I cannot believe that I am the only one to have experienced this. I find it dangerous and I have no confidence in pulling out at junctions. I realise that it is my driving technique but I do not accept that I am wrong. Does anyone know how to alter the electronics.
colin
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 13th Jun 2011 6:30 pm |
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highbayrack
Member Since: 09 Jul 2008
Location: Northamptonshire
Posts: 2776
 
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Same thing used to happen to me quite a few times after I changed from an Audi, first it was put down to my driving style by the dealer, then 10 forcash discovered a faulty switch on the brake pedal which, he changed, and I've never had the problem since  On a mission to find the perfect Pork Pie. Just Found it (I think)..(Yes I have)
Official product sponsor for "Bloodhound SSC" 1000+ mph world land speed record
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| 13th Jun 2011 7:03 pm |
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trebaix
Member Since: 24 Oct 2010
Location: midlands
Posts: 11
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Thanks for that, I will investigate and keep you updated. In the meantime I have tried to resist left foot braking.
colin
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| 15th Jun 2011 1:24 pm |
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lee157
Member Since: 01 Oct 2008
Location: in the middle
Posts: 557
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Hi Colin
Personally i think this is down to the automatic gearbox, if you are coasting at low speeds as you describe the gearbox will keep 2nd gear selected and wont select 1st till you come to a standstill (this has been known as the shunt feeling in the rear when coming to a standstill), when you then put you foot on the accelerator the system takes a while to decide should i run in 2nd gear using the torque converter or should i down shift to 1st gear to give the acceleration the person has asked for. Usually it's the latter and the delay is the autobox down shifting to 1st gear and decreasing to power while the gear is changed.
If however you drive in command shift the box doesn't change down to 1st gear at standstill, and you move off in 2nd gear without any problems, therefore if coasting at low speeds the gearbox will hold onto 2nd gear and use the torque converter to increase revs.
I personally have found that what you describe doesn't happen when using command shift, and of course my Disco 3 is a 54 plate so things may have changed since then.
This is just my logic to the problem.
Lee
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| 16th Jun 2011 3:27 pm |
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MJIbex
Member Since: 13 Sep 2009
Location: Reading
Posts: 195
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If you go anywhere near the brake and throttle at the same time on a 3.0 diesel; it will throw it toys out of the cot!! It will back all power off.
So if you have a brake switch fault this could be a major issue.
Regards
Mark.
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| 17th Jun 2011 12:45 pm |
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games1
Member Since: 15 Jan 2011
Location: Dalkeith
Posts: 4
 
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Hi Trebaix
Great to have someone experience the same thing as myself although you may have identified the issue, left foot braking. Tend to left foot break all the time so often using a trailing brake into tight situations which results in a considerable hesitation.. Several others on the Australian forum have similar experiences.
George
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| 19th Jun 2011 8:55 am |
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doubledoom
Member Since: 09 Jul 2010
Location: Lowestoft
Posts: 132
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I thought it was just turbo lag. A few times I have come rolling up to a roundabout or junction braking to then switch to accelerator (not both at the same time) and find there is moment before the power comes on. Never from a standing stop, but when rolling, even if very slightly. Can be embarrassing (or in my mind it is) if someone flashes to let you out and the car takes for what seems forever but is probably only a second before kicking the power in and often with quite a lurch.
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| 10th Jul 2011 12:42 am |
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Matt in Macc
Member Since: 13 Apr 2010
Location: Macclesfield
Posts: 9
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It's the 2nd gear hold. I had a similar experience of slowly sliding rather than athletically leaping onto a roundabout and as a result approaching roundabouts is one of the few times that I use command shift - bang it down into first as you slow on approach, and then flick back to D. Box doesn't change up but holds 1st so you can move off sharply, and you don't have to be straight back on the lever to change up as you accelerate away.
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| 10th Jul 2011 6:09 am |
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crews control
Member Since: 18 Mar 2007
Location: Dorset
Posts: 5011
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Matt in Macc wrote:bang it down into first as you slow on approach, and then flick back to D.
I've just been trying that this morning and it works... good tip thank you.
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| 10th Jul 2011 10:09 am |
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PSC
Member Since: 01 May 2006
Location: Johannesburg
Posts: 255
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I agree, that this is a gearbox issue and not a “lag†issue as I have experienced this on my V8, where it selects the wrong gear, it also seems that the yaw sensors restrict it from changing down (kickdown).
No Lag on the V8 and 400Nm + from 1000 RPM
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| 10th Jul 2011 10:53 am |
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DerekT
Member Since: 02 Jan 2010
Location: Aberdeen
Posts: 14
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Having just got my D4 back from Dealer 35k service, one of the issues I reported was exactly the symptons you describe! Of course it came back as no fault found so I thought I would try this site to see if anyone else had the problem. As you say, it only happens occasionally, but when it does it happen it is a buttock clenching moment!
Usually when you coast up to a junction, judging a gap, then putting foot down and...... nothing!! Have to lift foot off, then back down again and off it goes. VERY disconcerting.
Having read what you feel to be the cause, I will watch out for that. For my own part, I believed it was when I was going at low speed after foot off the accelerator, perhaps hovering over the brake, then accelerating sharply. Will let you know when it happens again.
Apart from that still very happy with the D4, a pleasure to drive.
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| 15th Jul 2011 6:19 am |
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