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Alastaird



Member Since: 13 Apr 2013
Location: London
Posts: 3

United Kingdom 
Defender TD5 flat spot woes and power loss! Please help!!
Hi all,

This is my first post in the forums wondering if anybody can give me a hand. I'm a med student from Notts with a 2001 defender td5


To cut a long story short, I had terrible cold start acceleration performance. 2001defender TD5 Car was a menace to pull out into the road as took good 20 sec to get any sort of acceleration or power....


Anyway I unplugged the MAF sensor and immediately got unbelievably good performance - best ever so far with my landy.

Concluded was MAF problem as have already blanked off EGR months ago.

Bought new expensive genuine LR MAF and fitted it. When Plugged in the acceleration problem is even worse... there is a massive flat spot at low RPM's takes about 30 sec for any sort of power to develop... truck is undrivable with it plugged in.

I'm thinking this is an airflow problem?? APP sensor?

Does anyone have any ideas about what to do next? I finally thought I was going to get a few trouble free months with the landy but it thought otherwise....

I've just cleaned out the MAP sensor this morn and had no effect...

Thanks so much in advance for any help!

Hope everyone's had nice weekend

Alastair
Post #227125 14th Apr 2013 11:29am
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barbel jim



Member Since: 12 Dec 2012
Location: Northants
Posts: 1430

United Kingdom 2005 Defender 90 Td5 HT Tonga Green
Unfortunately sometimes they fail straight out the box Big Cry I would take it back and swop it for another first.
Post #227127 14th Apr 2013 11:34am
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K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
^^^^

As your symptom actually worsened with the MAF sensor swap out I would agree totally. Do you know anyone else locally with a TD5 that you can do a 'diagnostic' swap with the two sensors you have or 'borrow' theirs to fit to yours perhaps? Thumbs Up If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #227128 14th Apr 2013 11:38am
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Alastaird



Member Since: 13 Apr 2013
Location: London
Posts: 3

United Kingdom 
ok thanks for your quick responses!

Will email the company tomorrow. it was from Island 4x4 so will have to speak to them

Assuming the MAF is fine what else could it be? It's been suggested blocked air hoses ect?


So frustrating!
Post #227137 14th Apr 2013 12:08pm
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TR51



Member Since: 17 Apr 2012
Location: Dorset UK
Posts: 333

France 2014 Defender 110 Puma 2.2 SW Corris Grey
I would get a replacement MAF sensor first to sort the main issue.

Then if your still not sorted I would look at:
- changing air hoses (at higher speeds if the TD5 hoses have delaminated they can collapse, so take off to see if delamination has occured)

- cleaning the MAP sensor
http://www.landyzone.co.uk/lz/f67/removing...98286.html

- stuck waste gate actuator (like hitting a power wall, for me at about 60, with no acceleration possible on any incline)
http://www.youtube.com/watch?v=FyZ4zXPZOf8
Post #227169 14th Apr 2013 4:05pm
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barbel jim



Member Since: 12 Dec 2012
Location: Northants
Posts: 1430

United Kingdom 2005 Defender 90 Td5 HT Tonga Green
Alastaird wrote:
ok thanks for your quick responses!

Will email the company tomorrow. it was from Island 4x4 so will have to speak to them

Assuming the MAF is fine what else could it be? It's been suggested blocked air hoses ect?


So frustrating!


Is your landy standard? If it has been hoped up with a larger intercooler and running more boost sometimes a standard maf cannot cope with the amount of air flow Thumbs Up
Post #227242 14th Apr 2013 6:18pm
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Alastaird



Member Since: 13 Apr 2013
Location: London
Posts: 3

United Kingdom 
No completely standard... I've removed EGR that's it.

So took to local garage who cleared all fault codes with new MAF.

Car starts and runs fine BUT absolutely no low end grunt. Once turbo kicks in its absolutely great.

Is there any way of making the turbo kick in any earlier?

(garage tested the MAF and said it was fine...


Is there a way of adjusting waste gate actuator arm length for example (worried to touch it Shocked )


Thanks for any help!
Post #227549 15th Apr 2013 6:06pm
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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 6105

United Kingdom 2006 Defender 110 Td5 SW Epsom Green
You can adjust the waste gate actuator arm (shorten it to give more boost) but without a "boost box" to mask the extra pressure from the ECU, you'll just go straight into limp home mode. plus without any extra fuelling you'll get no more power anyway.
Post #227559 15th Apr 2013 6:49pm
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Pam W



Member Since: 25 Oct 2011
Location: North Yorkshire
Posts: 1169

England 1998 Defender 90 Td5 SW Auto Oslo Blue
Also may be worth checking / cleaning the fuel filter. My Td5 was really sluggish on acceleration, especially 40-60, and sorting the fuel filter helped a lot - drove like a different vehicle. Our blog - http://landytravels.com/

Yorkshire Off Road Club - http://www.yorkshireoffroadclub.net
Post #227648 15th Apr 2013 9:30pm
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bell-auto-services



Member Since: 08 Jul 2007
Location: North Yorkshire
Posts: 2232

United Kingdom 2013 Defender 110 Puma 2.2 USW Orkney Grey
I have hadthese airflow meters in the past and for some reason as said have failed straight out of the box, i know it states OEM but i do have my suspections as to if its EXACTLEY the same as OEM or just made at the same factory?

http://www.island-4x4.co.uk/flow-sensor-mhk100620g-p-3943.html

As diesel-jim stated you could also have a sticking turbo wastegate so thats worth a checkafter the maf is verifyed.

You can measure the output from the maf with a multi meter as a simple testif you can get hold of one? 2Vout from the miiddle pin with the engine running and while it still connected to the car is 60kg/hrof air which is perfection, much less than 1.7V and its about dead.

Pete
Post #227656 15th Apr 2013 9:41pm
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adafish



Member Since: 30 Mar 2009
Location: atherstone
Posts: 1385

United Kingdom 1984 Defender 110 300 Tdi DCPU Stornoway Grey
here ya go Alistair.....  Putting Dreams on Drives at JLR Solihull..
Post #227660 15th Apr 2013 9:45pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5741

2006 Defender 110 Td5 USW Zermatt Silver
I'm in Herts and got a MAF if you can get here for a test? But personally just send it back as faulty. Other faults won't be altered by unplugging/plugging the MAF, so will be MAF issue.

I use uprated MAF's from alive tuning. Last much longer.

Andy
Post #227709 16th Apr 2013 6:35am
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Laurie



Member Since: 22 Feb 2008
Location: Sussex, England
Posts: 2897

England 2005 Defender 90 Td5 XS CSW Bonatti Grey
I've had the same problem for several years.
Sometimes, when I start it and drive off, there is no power for several seconds, then it suddenly hits you in the back and zooms away.
Most times it's perfectly OK.
It doesn't make any difference whether the engine's hot or cold.
I've just learned to live with it. 
Post #227754 16th Apr 2013 9:53am
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robk



Member Since: 30 Dec 2015
Location: Zeist
Posts: 12

Netherlands 2002 Defender 110 Td5 SW Epsom Green
And.... how was your problem solved?
After reading this interesting thread, i concluded I have exactly the same problem.

I am curious how this problem eventually was resolved?

KR
Rob
Post #487070 30th Dec 2015 9:57pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5865

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I too have a similar issue (1999 td5/10p engine). Just as a matter of interest, when you press the throttle pedal, how far do you press it before you notice revs picking up? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #487162 31st Dec 2015 8:42am
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