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Jago



Member Since: 15 Jan 2016
Location: Somerset
Posts: 7
England 
TD5 poor fuel economy
Hi I have a 90 TD5 which has developed a slight lack in power and a drop in mpg from 28mpg to 23 mpg on the same journeys week in week out I have a stage 2 bell auto tune with full width inter cooler, have replaced the maff air flow meter four times this year as they were faulty, have checked all pipe work changed air filter, fuel filters, no joy it has egr blanked off and a de cat exhaust the boost pressure is 20psi and is working correctly. Any ideas what else to check greatly appreciated thanks jago
Post #493344 17th Jan 2016 5:32pm
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ibexman



Member Since: 13 Dec 2008
Location: Essex
Posts: 2945
United Kingdom 
Fuel leak
Post #493360 17th Jan 2016 6:23pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
fuel regulator driver side back of engine


http://www.discovery2.co.uk/Fpr.html
Post #493364 17th Jan 2016 6:30pm
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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769
England 2004 Defender 110 Td5 CSW Bonatti Grey
On the bell auto website it shows you how to check the maf with a multimeter (just to rule it out again) as four in a year could mean there's a problem somewhere else that's killing the maf? Ray
My build thread
http://www.defender2.net/forum/topic17615.html
Post #493366 17th Jan 2016 6:30pm
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grumpy old git



Member Since: 16 Nov 2013
Location: United Kingdom
Posts: 153
United Kingdom 
^^^^ Do you have a K&N fitted?
Post #493381 17th Jan 2016 7:02pm
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Jago



Member Since: 15 Jan 2016
Location: Somerset
Posts: 7
England 
I have a piper cross filter similar to k&n. What to check on fuel regulater?
Post #493391 17th Jan 2016 7:29pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
at the back engine driver side if fuel regulator is leaking smell of fuel and fuel run down over starter motor and drips off bell housing
Post #493398 17th Jan 2016 7:40pm
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Hufflepuff



Member Since: 25 Oct 2014
Location: Hampshire
Posts: 727
England 2005 Defender 90 Td5 XS CSW Tonga Green
Hmm so I might have a similar issue. Car has dropped a couple of mpg no matter how gently I drive it - and its started leaving a drip where I park it, but is using no oil.

The problem is the undertray is preventing me from seeing where its coming from - and its not dripping to the point where I can actually sit and watch it. Its difficult to get my hand down under the regulator to see if fuel is coming out - but can you lose a significant amount of fuel out of it, or is it just likely to be a mild drip which isn't too critical in the short term?

Would have liked to have limped through to warmer and drier conditions to make a more thorough assessment.
Post #496401 25th Jan 2016 10:13pm
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ajps72



Member Since: 08 Jan 2012
Location: Lima Peru
Posts: 105
2001 Defender 110 Td5 SW Chawton White
Jago wrote:
I have a piper cross filter similar to k&n. What to check on fuel regulater?


Not sure if the Piper cross filter uses oil like the K&N, but that oil will kill your MAF very fast Augusto

Defender 110 TD5 2001
Discovery 4 TDV6
Post #496455 26th Jan 2016 4:30am
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hopeydaze



Member Since: 11 May 2011
Location: Bath
Posts: 30
United Kingdom 2006 Defender 90 Td5 SW Cairns Blue
Also worth checking the fuel filter on the outside of the chassis just behind the drivers door. Mine leaked pretty badly at one time
Post #497003 27th Jan 2016 2:06pm
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Jago



Member Since: 15 Jan 2016
Location: Somerset
Posts: 7
England 
Have looked on the bell auto site and it said check maff reading on pin 2 with multimeter which I have done but have no reading but on pin 3 I get 1.4-1.5 so thinking maff might be at fault has anyone got any other ideas before I spend another £60?? Thanks
Post #498377 30th Jan 2016 8:02pm
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mk1collector



Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769
England 2004 Defender 110 Td5 CSW Bonatti Grey
Have you checked in the red ecu plug to see if there is oil in there? Ray
My build thread
http://www.defender2.net/forum/topic17615.html
Post #498380 30th Jan 2016 8:19pm
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Jago



Member Since: 15 Jan 2016
Location: Somerset
Posts: 7
England 
Yes replaced a couple of months ago by landrover dealer
Post #498402 30th Jan 2016 8:47pm
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johnszs



Member Since: 16 Aug 2010
Location: Hereford
Posts: 459
United Kingdom 2004 Defender 90 Td5 XS CSW Alveston Red
I would disconnect the loom going to the maf and try that for a week or so and see if theres an improvement 2004 TD5 Defender 90 xs station wagon
Post #498445 30th Jan 2016 9:56pm
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1763
United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
Hufflepuff wrote:
Hmm so I might have a similar issue. Car has dropped a couple of mpg no matter how gently I drive it - and its started leaving a drip where I park it, but is using no oil.

The problem is the undertray is preventing me from seeing where its coming from - and its not dripping to the point where I can actually sit and watch it. Its difficult to get my hand down under the regulator to see if fuel is coming out - but can you lose a significant amount of fuel out of it, or is it just likely to be a mild drip which isn't too critical in the short term?

Would have liked to have limped through to warmer and drier conditions to make a more thorough assessment.


If you look at the FPR (rear right side of the block as sat in the drivers seat) then you'll see a suspicious clean/dieselly streak below it! Or if it was as bad as mine, when the engine is running you'll see the hose along the side of the block squirting diesel everywhere.
Post #498447 30th Jan 2016 10:01pm
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