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vipergreen



Member Since: 06 Jul 2023
Location: Herts
Posts: 7

 2003 Defender 90 2.5 TD PU Oslo Blue
Emissions Failure MOT
Hi

Having owned my 2003 defender for a couple of months it went in for its mot and has failed on emissions.

I tried the additive new filters and drive hard pre retest but no joy.

Tester believes it’s due to the remap as under full throttle it’s gives a heavy Black puff possibly indicating over fuelling.

My thoughts are get a Nanocom and map the ecu back to standard, is this easily done and am I likely to see an improvement ?.

The symptoms could also be worn injectors will a Nanocom help to identify this ?

Any recommendations in the Herts/Beds area who may be able to diagnose or help with the map should I not bother trying to resolve myself.

All help and advice greatfully received.
Post #998939 6th Jul 2023 5:17pm
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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 6086

United Kingdom 2006 Defender 110 Td5 SW Epsom Green
Check that the MAF isn't faulty. That caused mine to smoke more than usual when it was faulty.
Post #998943 6th Jul 2023 5:55pm
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vipergreen



Member Since: 06 Jul 2023
Location: Herts
Posts: 7

 2003 Defender 90 2.5 TD PU Oslo Blue
Tested the Maf with a voltmeter and readings appeared right also cleaned the Map
Post #998944 6th Jul 2023 6:10pm
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barbel jim



Member Since: 12 Dec 2012
Location: Northants
Posts: 1418

United Kingdom 2005 Defender 90 Td5 HT Tonga Green
Is it a genuine maf? As in Siemens vdo? I found the best way to clean injectors is to take them out, and change the washers and seals. I use millers eco max every fill, and was still surprised how much crud was on the nozzles. Cleaning them and refitting made a noticeable difference.
A lot of the remaps are just increased fuelling…. If you know who the tuner is try contacting them. They might sort for a small fee, or get it remapped by a reputable company. Unfortunately there’s alot of people who request rolling coal and popcorn limiters Thud
Post #998947 6th Jul 2023 6:42pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3392

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
Depending who mapped your TD5, some tuners disable the MAF. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #998951 6th Jul 2023 6:59pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5641

2006 Defender 110 Td5 USW Zermatt Silver
Change who does your MOTs. My tester doesn’t even poke the pipe in. 😂😂
Post #999253 8th Jul 2023 6:50pm
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vipergreen



Member Since: 06 Jul 2023
Location: Herts
Posts: 7

 2003 Defender 90 2.5 TD PU Oslo Blue
Exactly my thoughts, I’m just up the road from you in Hitchin.

Be great if you could share who you use by PM

Would be very much appreciated
Post #999280 9th Jul 2023 6:17am
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Screbble



Member Since: 26 Apr 2015
Location: Lancashire
Posts: 2076

United Kingdom 2004 Defender 90 Td5 XS CSW Zambezi Silver
I agree with much of what has been said.

My only thoughts are that as your Defender failed and it is recorded on the system, then the ‘new’ MOT Testing Station will probably be obliged to look more closely than it otherwise might?

In any case, I hope for a positive outcome 👍
Post #999281 9th Jul 2023 7:06am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17305

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
I've never actually known a tester to look at the database before conducting the test, although it is likely that they'll see the failure report when they enter the result of the test.
Post #999293 9th Jul 2023 8:30am
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1002

France 2002 Defender 110 Td5 DCPU Chawton White
Don't want to be Censored on someone parade... but when you have your mapping changed I doubt any of these tuners will necessary make sure or can guarantee the engine still passes the emissions requirements. Same with all the decatting business.

In the USA it's obviously a popular thing to do with zero consideration for emissions and a bunch of business and u-tubers have received letters from the EPA threatening with fines.
Post #999296 9th Jul 2023 8:39am
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Screbble



Member Since: 26 Apr 2015
Location: Lancashire
Posts: 2076

United Kingdom 2004 Defender 90 Td5 XS CSW Zambezi Silver
blackwolf wrote:
I've never actually known a tester to look at the database before conducting the test, although it is likely that they'll see the failure report when they enter the result of the test.


Interesting. In my experience they look at previous advisories etc. in advance.

Having said that, I am one of the group that has a pragmatic and reasonable MOT Tester who actually understands and has an interest in Land Rovers.

I hope the OP’s story ends well 👍
Post #999302 9th Jul 2023 9:24am
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Chicken Drumstick



Member Since: 17 Aug 2020
Location: Near MK
Posts: 705

United Kingdom 
Re: Emissions Failure MOT
vipergreen wrote:

Tester believes it’s due to the remap as under full throttle it’s gives a heavy Black puff possibly indicating over fuelling.


I would take it elsewhere. The smoke test should not involve full throttle!!!!
Post #999309 9th Jul 2023 10:24am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17305

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Screbble wrote:
blackwolf wrote:
I've never actually known a tester to look at the database before conducting the test, although it is likely that they'll see the failure report when they enter the result of the test.


Interesting. In my experience they look at previous advisories etc. in advance.

Having said that, I am one of the group that has a pragmatic and reasonable MOT Tester who actually understands and has an interest in Land Rovers.

I hope the OP’s story ends well 👍


I guess it depends on the tester. If you were presenting it for a retest I would certainly expect them to.
Post #999313 9th Jul 2023 10:39am
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Chicken Drumstick



Member Since: 17 Aug 2020
Location: Near MK
Posts: 705

United Kingdom 
Retest is very different. You get a set time period and they should only be retesting those items.

If presented for a brand new test, then the tester should be looking at it with fresh eyes and not pre-judging it.
Post #999316 9th Jul 2023 11:24am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17305

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
My thoughts exactly.
Post #999317 9th Jul 2023 11:54am
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