Are the tyres the correct circumference, if not this will effect odometer readings.
Any sign of a fuel leak?
NJSSAm I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
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23rd Jan 2022 6:34 pm
Hawky443
Member Since: 23 Jan 2022
Location: Glasgow
Posts: 5
Its the standard 19s that came with the car, so i assume the computer should be ok.
No sign of fuel leak but i do feel when i take my foot off the gas some resistance, could it be the brake switch? or a binding brake? im going to clean out the air intake and change the 02 sensors.
I also think i would like to change glow plugs, im just a bit scared of doing this :/
Cheers,
Marc
23rd Jan 2022 7:42 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73092
Could be binding brakes, carefully check if they are getting hot. Plus you don’t say what kind of driving. Short trips in these temps would easily only get 18mpg.
23rd Jan 2022 7:46 pm
Hawky443
Member Since: 23 Jan 2022
Location: Glasgow
Posts: 5
yeh this is on short journeys, I've not really been far in it.
23rd Jan 2022 7:56 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73092
Another question, as above how do you derive the 18mpg, trip comp or real calculation? If the former be aware that it can be 2 - 5 mpg over optimistic so reality could well be 13 - 16mpg.
23rd Jan 2022 8:00 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5052
Ignore the dash lie-o-meter and do the calculations yourself. Short journeys could mean you're not fully warmed up (min 10 mins) and so less efficient mpg can be expected.
Check the brake disc temps as above just to rule out any binding which will eat into mpg figure as well as discs, pads, calipers, amongst other components.
Welcome to the money pit yµ (idµ - eAµ) ψ=mψ
23rd Jan 2022 8:03 pm
Hawky443
Member Since: 23 Jan 2022
Location: Glasgow
Posts: 5
Yeh i will have a check, im wonderign if the parking break hasnt been done correcly, what temps should i expect on the pads?
Are you driving like you nicked it ? It's quite tempting but not very economical .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
23rd Jan 2022 8:24 pm
Hawky443
Member Since: 23 Jan 2022
Location: Glasgow
Posts: 5
no this is me being very reserved!
23rd Jan 2022 8:35 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5052
Hawky443 wrote:
Yeh i will have a check, im wonderign if the parking break hasnt been done correcly, what temps should i expect on the pads?
After a run with light braking they should all be similar, with little variation on one axle set. Typically, if you went for a run where little or no braking is required, you could expect to see around 50°c on the front discs and 35 - 45 on the rears.(unobstructed quiet stretch of road with very light braking)
If braking is unavoidable you want to see similar readings for each axle set. If one is much hotter than its opposite side there's a problem. One easy test is to find a flat level and smooth surface. (quiet car park) Put the car in drive and release the brake allowing the car to reach 5 mph. Then select neutral and staying off the brakes allow it to come to a stop naturally. It should do this very softly and with absolutely no sudden or sharp stopping, particularly right at the very end. If it wants to stop quickly and sudden, or the steering wheel is being pulled from the straight ahead, there is a problem.
If you can smell the brakes at a wheel after a run with little braking, that would also be an indication something is not right. Alternatively, jack up each corner and check the freewheel ability of each, but expect more resistance from the rears.yµ (idµ - eAµ) ψ=mψ
23rd Jan 2022 11:42 pm
dingdongs
Member Since: 30 May 2012
Location: St. Lawrence Bay Essex
Posts: 186
Mine only gets 7 mpg towing a 5 gang mower around cutting a 10 acre field at 10 mph.
Hour and a half later then......
Once removed seems like a Ferrari.
10th Feb 2022 11:41 pm
galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
cool weather will cause fuel burn heater to kick in which dont help,,,been cold in bonny scotland of late
10th Feb 2022 11:53 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
My short 5 mile commute in my d3 shows 22mpg on the lie o meter, knock off 10 percent and its only slightly better than your d4, and we are warmer down here.
Most I have ever seen is 30 cruising at 70 for 100 miles straight, again knock off 10 percent for an accurate figure.
11th Feb 2022 12:29 am
galwaygreen
Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525
your powering 2,7 tons...and its a lovely drive...economy is a corsa...take your choice
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... All LED interiors lights, DRLs, Spare Wheel protector.
