 | Home > Td5 > Steady Drop in MPG - WHY!? |
 
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| bogwert Member Since: 03 Sep 2016 Location: Dundee Posts: 194   
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A question for the TD5 Experts of Defender 2?!
Truck: 90 TD5 15P Over the past 5 months I have noticed a continuous drop in our MPG? The first year of owning the 90 she was pretty consistent at 28MPG - even with various driving styles - Long journeys / Short town trips - mid length up to the highlands... 28 .. there or there about. Since Oct 17 its steadily declined up to the point of after filling up coming down to the Lake District we are at 20MPG. She had a oil/ air / fuel filter service in Nov 16. A full Transfer box / Gearbox / Diffs / Engine / All Filters change in Dec 17. I've looked along the fuel lines, that i can get to and cant find any wet / leaky areas. All oil levels are correct... Any suggestions? 
 Click image to enlarge Chris 2014 Discovery 4 TDV6 HSE 2003 Defender 90 TD5 CSW Last edited by bogwert on 19th Mar 2018 3:00pm. Edited 1 time in total |
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19th Mar 2018 1:12pm |
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| gazman Member Since: 17 Aug 2015 Location: Liverpool Posts: 652  
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are you simply driving it harder? or is it the cold? are your tyre pressures correct?
As above check brakes etc for binding. Mine dropped off too, it was a slight boost leak and I was driving harder to drive the same speed. 2014 - current ..... 2003 defender td5 90 (my car) 2009 - current .... 2005 zx10r |
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19th Mar 2018 2:59pm |
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| bogwert Member Since: 03 Sep 2016 Location: Dundee Posts: 194
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I did change the rear pads a while back but I would have expected them to bed in by now.
I wouldn't say I'm driving harder, and yes I currently is pretty cold, although pretty standard for Scotland.. and its not been ice cold since October... I hope! Tyre pressures, I'm pretty good at keeping them level and correct - but again a good shout, new MT's on there 3 weeks back so I'll endeavor to keep them correct. a boost leak? Would this come from the input / output on the turbo? Now you mention that there is a slight dint in on the in hose by the radiator!? might have started to tear through?!  Chris
2014 Discovery 4 TDV6 HSE 2003 Defender 90 TD5 CSW |
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19th Mar 2018 3:19pm |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720 
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Weather getting colder. That graph pretty much follows the temperature drop through winter, including the latest cold snap.
Diesels take longer to warm up than petrol engines, and don't reach full efficiency until warm. You'll also be running things like the heater fan, as well as heated screens and seats if fitted. You'll be using your lights more too. All that drains the battery which the alternator has to top back up which puts more load on the engine. Try putting a bit of card board in front of the radiator and see if your fuel economy improves. |
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19th Mar 2018 3:32pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4784 
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Would be worth having it plugged in and having a look at the injector trim. They may be getting worn and the ecu has reached its trim limit 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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19th Mar 2018 3:43pm |
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| bogwert Member Since: 03 Sep 2016 Location: Dundee Posts: 194
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Hummmm... Ok, so see if it improves over the next few months... if spring does come!
If not, start plugging things in!!  Chris
2014 Discovery 4 TDV6 HSE 2003 Defender 90 TD5 CSW |
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19th Mar 2018 4:07pm |
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| Muddybigdog Member Since: 11 Apr 2014 Location: Suffolk Posts: 991 
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Defrosting, demisting, fan on longer/higher, oil in engine thicker, oil in gearbox/diffs thicker, lights on more often, plus diesel reduces 1-2% in a colder climate, hence uses more fuel Jumped ship to reliability - Mitsubishi L200
Puma 90 XS - Sold D3 - 2.7 S x2 (both Sold) Freelander 2 HSE - Sold Freelander 1 - Sold Disco 2 - Sold |
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19th Mar 2018 10:42pm |
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| Hufflepuff Member Since: 25 Oct 2014 Location: Hampshire Posts: 723  
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You shouldn't be getting 20 mpg on a motorway run though in a 90, unless you were giving it full beans all the way down? The worst I ever achieved was 24mpg in a fully loaded 90 coming up through France at a steady 130kph. Normally in the UK I'm at around 28mpg the motorway at a steady 65-70mph. 2005 Td5 90 XS
1989 V8 110 CSW |
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20th Mar 2018 12:06am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4385
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Hi Grafty. What is the trim limit? |
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20th Mar 2018 7:54am |
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| bogwert Member Since: 03 Sep 2016 Location: Dundee Posts: 194
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Had a wee look at what was the 'dint' in the pipe! its now a small tear! 
Please excuse the mud, its from this weekend's green laneing, Friday afternoon is bath day! Click image to enlarge Click image to enlarge Click image to enlarge Anyone know the part number for a replacement pipe? I'm thinking it might be a mixture of the 2 cold weather and leaky pipe meaning the engine is working harder? Chris 2014 Discovery 4 TDV6 HSE 2003 Defender 90 TD5 CSW |
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20th Mar 2018 9:31am |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018 
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It's good you may have got to the failure, it is what looks like a the bolt head just below that's caused the damage?
Proves monitoring the fuel economy religiously can be used as part of a maintenance programme. |
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20th Mar 2018 10:49am |
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| bogwert Member Since: 03 Sep 2016 Location: Dundee Posts: 194
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I think its defiantly a contributor!!
Now the simple 10 minute job to change the pipe.... AH! Any shouts on the part number? cant find it on LRCAT! Chris 2014 Discovery 4 TDV6 HSE 2003 Defender 90 TD5 CSW |
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20th Mar 2018 11:23am |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2196 
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Looks like PNH102090 to me (cooling and heating > cooling > intercooler)
Steve 02' 110 TD5 Double Cab Rebuild Thread 84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale Mobile Diesel Heater Build Thread |
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20th Mar 2018 12:16pm |
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| bogwert Member Since: 03 Sep 2016 Location: Dundee Posts: 194
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Ah! Found a label hiding further down! PNH 102071!
Guess I might as well just replace the whole length!  Chris
2014 Discovery 4 TDV6 HSE 2003 Defender 90 TD5 CSW |
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20th Mar 2018 12:28pm |
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