Sport Range rover sport l320 2.7 whine/drone noise

Hi peeps would really appreciate if someone could shed some light on a issue im having with my 2005 range rover sport 2.7 tdv6

So when im cruising there like a constant hum whine droning noise but only whilst the Accelerator is pressed one you let off the gas its silent soon as you touch the gas again any amount the noise is back instantly

Also i noticed that when accelerating with about 1/2 to 3/4 throttle theres like a duf duf duf sound the speed of the whatever the vehicle is travelling but it isnt domanant

And when the car isnt up to temperature i always run it couple of mins before moving off every morning or when its been sat and cooled say if im sat in slow moving traffic if i slightly come off the brake whilst its in drive the car will shake a bit like someone is pushing it then pulling it back like a shudder soon as i touch the Accelerator to drive away its instantly smooth when its up to full temperature its doesnt do it

Any help and knowledge would be appreciated all .Thanks in Advance

No need to let a modern car warm up more than 30 seconds.
How long have you had the car and when was the gearbox last serviced? How many miles has it done?

kermit_rr said:

No need to let a modern car warm up more than 30 seconds.
How long have you had the car and when was the gearbox last serviced? How many miles has it done?

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Hi bud gearbox had a megaflush service 3 months ago with reciept gears up and down are smooth no bangs etc and its on 132k miles bud extensive service history aswell

Have the front and rear prop shafts looked at or check ithem yourself.
Check both ends and the center bearing as well. It's pretty much a discovery 3 underneath.
Any play in the ends of either shaft or the rear shaft center bearing and they'll need attention.

Mark Piercy said:

Have the front and rear prop shafts looked at or check ithem yourself.
Check both ends and the center bearing as well. It's pretty much a discovery 3 underneath.
Any play in the ends of either shaft or the rear shaft center bearing and they'll need attention.

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I was thinking the TC could give shuddering, coming off the brakes?

Have you had the codes read recently?

kermit_rr said:

Have you had the codes read recently?

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No will get that done actually as my mate has a snapon diagnostic kit

kermit_rr said:

I was thinking the TC could give shuddering, coming off the brakes?

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Even if the tc is disabled it still does it

loronge2023 said:

No will get that done actually as my mate has a snapon diagnostic kit

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Don't know if that will work or not, a lot of jlr cars need specific kit

loronge2023 said:

Even if the tc is disabled it still does it

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TC torque converter

They are a bit fussy on diagnostics compatability

kermit_rr said:

Don't know if that will work or not, a lot of jlr cars need specific kit

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Yea scanned it when i first had it showed loads of codes as battery was changed so cleared them checked day after and showed zero codes

loronge2023 said:

Yea scanned it when i first had it showed loads of codes as battery was changed so cleared them checked day after and showed zero codes

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Zero!? Blimey.. something must be broke

Mark Piercy said:

Have the front and rear prop shafts looked at or check ithem yourself.
Check both ends and the center bearing as well. It's pretty much a discovery 3 underneath.
Any play in the ends of either shaft or the rear shaft center bearing and they'll need attention.

Click to expand...

Had brand new rear prop with 5 year warranty how do i check centre bearing for play

kermit_rr said:

Zero!? Blimey.. something must be broke

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I thought that but everything works as it should been highly maintained from the look of it with the reciepts

kermit_rr said:

TC torque converter

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Ohh yea didnt think of that how would that be checked its booked in with a specialist locally but in 2 months time as he's fully booked until then

loronge2023 said:

Ohh yea didnt think of that how would that be checked its booked in with a specialist locally but in 2 months time as he's fully booked until then

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I'd expect and error code if it was poorly, but I'm not sure

Any oil in the diffs?

Datatek said:

Any oil in the diffs?

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Not a clue bud going to order the fluids and check how much is supposed in the front and rear and drain them measure how much has come out compared to how much was supposed to come out and then fill them to what its capacity suggests then give it a run and hopefully that sorts it if it is that and been caught in time

Check for sparkly bits in the diff oil when you drain it.

@1988smithy had a diff issue on his old L320 wonder what his symptoms were?

J