Seem to be having an increasing feeling that there's a big flat spot in the engine performance in MY12 SDV 8 sped.
Only had it a few weeks. I first notice it while towing with it hunting a lot between 7th and8th gear. Towed down to Cornwall on Saturday and found that putting gearbox in S mode I could hold the gearbox in 7th and get a calmer journey holding 60-65mph
General Driving 4up around in Cornwall without trailer and gearbox seems to always change up to a gear the engines unable to pull of is in a flat spot. When you try to accelerate a little the engine is flat and won't respond, so you press a bit harder which creates a rushed kick down and jerky progress.
Seems to happen when try to cruise around 70mph. If you try to add a little power its as if it's in too high a gear and won't pull, so you press a little harder which creates a jerky kick down and rapid unintended acceleration.
It's as if there's a flat spot around 1400 rpm right at the engine speed the gearbox is trying to keep the revs at
Feels like there's been a drop off in the available toque at lower rpm
There are no fault codes in the car.
Any thoughts / known issues ?
24th May 2015 8:35 pm
Jasonb
Member Since: 04 May 2013
Location: Bristol
Posts: 97
D4 hesitation and EGR valves
Beginning to think my issue might be down to EGR valves getting sluggish. Getting a lot of hesitation at low speed when rounding corners and at roundabouts.
The gearbox software has been updated but no improvement.
Theres very little on the forum about D4 EGR problems, mine has 70k miles.
Has anyone had EGR issues on a D4 and what were the symptoms ?
17th Jun 2015 10:29 pm
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26767
I am not aware of an egr failure on the 3.0 engine. There have been a few turbo related issues, but on the whole its a reliable unit.
17th Jun 2015 10:59 pm
Muddy Steve
Member Since: 23 Jan 2015
Location: Holmfirth
Posts: 180
Talk to these guys, they have a dealer network now.MY16 HSE Firenze Red Loving it
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18th Jun 2015 7:11 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Probably best to diagnose the issue first before adding a remap. The 3.0L and 8-speed should pull like a train.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26767
Jasonb wrote:
Hi Gareth
Thanks for you reply re my D4 egr question. I see from your profile picture you have a Series 2 ? I'm in the process of a chassis up rebuild of a 1960 S2. Engine built, currently refurbing the axles.
Sounds like from what you say and what I don't read about 3.0 egrs that they're unlikely to be my issue. What sort of turbo issues have there been and what sort of symptoms would I see ?
Thanks Jason
Jason, there are a few threads on here with turbo issues, cracked manifolds, etc. If you use the Search facility, and use the words "Turbo Valve Manifold" in the Technical D4 forum, you will get 3 relevant answers. These are not necessarily your problem, as Robbie says, get the fault codes read for an accurate diagnosis.
18th Jun 2015 8:25 am
Jasonb
Member Since: 04 May 2013
Location: Bristol
Posts: 97
Thanks Robbie, will looking into this.
Generally my 3.0 SDV pulls like train, it's just this annoying hesitation
18th Jun 2015 11:28 am
al cope
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10350
Is it a hesitation ?, as I was about to post in a similar vein. My 2012 has what I'm calling a "dead" feeling. Its usually if I'm cruising on a light throttle, then engine will suddenly feel like its gone flat - really hard to describe/liken to something else. The revs dont drop, the speed doesnt drop, and as soon as you touch the gas there's no hesitation/kick down as you describe, just this off feeling of the engine dropping the power.
AlVolvo XC90 B5 Plus Dark
Gone - MY18 D5 HSE - Corris on 22's with Black Pack
Now gone - MY16 D4 SE Tech, Loire Blue, Almond Leather, Privacy, plus some other goodies.
Old - MY12 D4 SDV6 XS Auto - Ipanema Sand with Almond Leather - Plus other niceties, and D4.com sticker
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19th Jun 2015 7:05 am
Jasonb
Member Since: 04 May 2013
Location: Bristol
Posts: 97
Hi Al,
Your description of the dead feeling is exactly it - The trouble I have through is if I try to then accurate a little the engine won't develop any more power (it's flat), so I then have to push a little harder which generates a kick down and surge forward when all I wanted is a gentle speed adjustment.
The issue is at its worst if cruising at 65-70mph. If I'm doing 80 its not an issue, but I trend to spend most time at 70mph or just below range.
The issue is more pronounced with the caravan on and trying to hold say 60mph +/- 5 mph. I find the gearbox gets into hunting situation with the slightest gradient or speed change because of this dead zone.
I replaced the throttle body as I read a TSB about it sticking but the issue is still there.
I'm thinking it could be sluggish EGR valves. From my understanding of their operation, on light throttle/ speed output the egr's deliver more exhaust gas to keep the emissions down, but they have to close quickly when power is requested to deliver the power.
I wouldn't mind the dead feeling if the engine would respond when requested.
If I hold the car in gear using command shift to avoid the kick down the engine will respond well but I feel there's a slight delay/hesitation before the power builds.
Other than that power output is fantastic and a brilliant tow car compared to my D3
19th Jun 2015 7:54 am
Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1061
Might be a red herring this (for you) but LR attended my 2013 SDV6 a few weeks ago. Real nice chap.
Same symptoms you are describing plagued me. Jumpy when cruising. But keen to go if you booted it. Seemed to be gear hunting all the time.
Nice man said easy. Motorised air intake flap in the front grill.
Sticks/binds and throttles the engines air consumption. ECU gets upset at varying air flow and therefore the gear box hunts a lot (uneven torque delivery).
He took it apart. Lots of WD40. Drunk some tea. Tested it with his laptop. Been fine ever since.
I have 55k miles on the clock. He said perfect mileage for that failure. He had to fix his own D4 a few months ago for exactly the same symptoms and similar mileage.
Been fine ever since. Might be worth checking the same for you?
Not an on obvious one to deduce but a simple check for starters.
Cheers."Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
27th Jul 2015 7:55 pm
Jasonb
Member Since: 04 May 2013
Location: Bristol
Posts: 97
Hi Kilovolt,
Thanks for the info
Are you referring to the Throttle body on top of the engine or the Turbo shut-off valve which is behind the front grille low down on the drivers side (right) just behind the radiator pack ?
I've replaced the throttle body with the revised part that doesn't stick. I'd be surprised if an LR engineer would go for a WD40 fix when an revised part is known to fix so I'm hoping you might be referring to the Turbo Shut-off.
The main problem I'm left with is hesitation from a standing or rolling start. Seems the engine takes a second to start delivering torque and until it does the gearbox doesn't hook up - then it takes off.
Cheers
27th Jul 2015 8:09 pm
Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1061
Good morning,
Did not pay to much attention at the time to be honest (let the man do his job and not hawk eye over his shoulder) but it was front grille off and a motorised louvre he was messing with. Not the throttle body on top of the engine.
And to be honest, if WD40 gets it sorted in 30 minutes and I dont have to suffer a morning at the stealers wrestling with their crap wifi or worse still, have to spend all day driving round in a Freelander that has not had the insides cleaned for lord knows how long, then that's great by me
Good luck all the same."Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
28th Jul 2015 6:22 am
Jasonb
Member Since: 04 May 2013
Location: Bristol
Posts: 97
Turbo shut off / Change over valve
Some times when I shut the car down among the various actuator reset noises I here a Donk,Donk noise from the area where the Turbo Change over valve is.
Sounds like it's doing an open/shut reset but it doesn't do it every time I shut down, perhaps 1 in 5 times.
Can make my mind up what should be normal. Should it make the reset noise on each shutdown or not at all
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