Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1656
strange noise in off road height
I periodically go through all the off road features on my D4 when parked on my level drive to make sure they are functioning ok.... 4x4 info, TR modes, low range, ride heights etc.
last night in off road height I noticed a buzzing noise coming from the rear nearside behind the wheel, like a fuel pump working away.
all 4 corners rise and fall ok, no noise from the compressor and nothing else to raise suspicions.
anyone have any clue what It could be? don't think its a faulty air bag but im no mechanic.
TIA
Rog2011 D4 XS 305 MY12 - gone but not forgotten
12th Feb 2020 9:01 am
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4411
That'll be the compressor!Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
12th Feb 2020 9:14 am
RogB
Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1656
Thought the compressor was under the bonnet and fed the air down to each corner ??
does each corner have it own compressor ??
please forgive my ignorance 2011 D4 XS 305 MY12 - gone but not forgotten
12th Feb 2020 9:15 am
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4411
No, the compressor is electric, and lives under a plastic cover just in front of the N/S rear wheel. When you raised the suspension, the compressor was running to replenish the reservoir. Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
12th Feb 2020 9:19 am
Bardley
Member Since: 02 May 2018
Location: Hertfordshire
Posts: 442
...don't play with or it will break. Just use it if you need it.
and, advisable not to raise /lower with brakes on or EPB set as it strains the suspension joints unnecessarily.2011 MY D4 HSE
Previously 2001 D2 TD5, 1996 D1 300Tdi, 1985 90 2.2 petrol.
Bikes! KTM, BMW, British, Classics and others.
12th Feb 2020 10:55 am
RogB
Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1656
I rarely use the EPB unless im in a slope, my drive is flat so its left in park. I check it all about once every 6 weeks or so and don't often use access height either.
so the noise is normal then ?
many thanks for all the replies 2011 D4 XS 305 MY12 - gone but not forgotten
12th Feb 2020 12:00 pm
RogB
Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1656
rrhool wrote:
No, the compressor is electric, and lives under a plastic cover just in front of the N/S rear wheel. When you raised the suspension, the compressor was running to replenish the reservoir.
so whats in the plastic box in the engine bay, RHS by the bulkhead ?2011 D4 XS 305 MY12 - gone but not forgotten
12th Feb 2020 12:02 pm
garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1115
Take the lid off and have a look
12th Feb 2020 12:12 pm
Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1029
RogB wrote:
rrhool wrote:
No, the compressor is electric, and lives under a plastic cover just in front of the N/S rear wheel. When you raised the suspension, the compressor was running to replenish the reservoir.
so whats in the plastic box in the engine bay, RHS by the bulkhead ?
Battery, a rather big heavy one "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)
12th Feb 2020 12:21 pm
RogB
Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1656
im on about the UK RHS not the continental one
on the LHS (UK Passengers side ) is the big heavy sparky thing
on the RHS (UK Drivers side ) there is what I thought was the compressor for the suspension but I was apparently wrong.
so any clues please folks?2011 D4 XS 305 MY12 - gone but not forgotten
12th Feb 2020 12:47 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4411
ABS pump.Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
that mystery box also doubles up as the soundproof box they mounted the alarm in, just so it doesn't wake anyone up if your car is being nicked.
12th Feb 2020 5:12 pm
RogB
Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1656
well mines not very soundproofed then
thanks rrhool
so does each corner have it own compressor or just the one at the rear passenger side to feed all 4 airbags?
and should it be making a buzzing noise in off road height ?2011 D4 XS 305 MY12 - gone but not forgotten
13th Feb 2020 9:07 am
M3bobby
Member Since: 21 May 2018
Location: Sleaford, LINCS.
Posts: 857
Just the one for all 4, I don’t tend to hear mine unless I’m stationary but it may be that the rubber mounting buffer bits are perishing.012MY RRS 5.0 Supercharged Autobiography (Current)
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13th Feb 2020 9:12 am
RogB
Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1656
cheers M3
Ill be booking it into Maltings in the next couple of months for an oil change and depending on funds gearbox, diffs and transfer fluids renewed too. Ill get them to have a good look over the whole car either way.2011 D4 XS 305 MY12 - gone but not forgotten
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) is the big heavy sparky thing 
