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benspray



Member Since: 30 Jul 2014
Location: Norfolk
Posts: 51

United Kingdom 2006 Defender 130 Td5 HCPU Chawton White
Black smoke dodgy MAF or keep looking..... :)

Hi All

Would this level of black smoke be caused by a failing MAF or should I keep looking?
MAF is reading low ie 38-40 at idle and 130-140 at 2000rpm so I've just ordered a new VDO/Siemens one which will be here mid next week all being well, but will it cure this or do I need to look elsewhere?
I still have the stock intercooler and CAT etc etc at the mo and as far as I know its not been mapped etc its just passed 108k miles

https://photos.app.goo.gl/emx3YZN5vozfi3CC8

Cheers
Ben

Post #861955 16th Oct 2020 5:28pm
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benspray



Member Since: 30 Jul 2014
Location: Norfolk
Posts: 51

United Kingdom 2006 Defender 130 Td5 HCPU Chawton White

ps I did fit a IRB EGR blank the other week as I thought it may be caused by the EGR valve initially...

Post #861956 16th Oct 2020 5:31pm
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benspray



Member Since: 30 Jul 2014
Location: Norfolk
Posts: 51

United Kingdom 2006 Defender 130 Td5 HCPU Chawton White

Had 3 or 4 litres of diesel purge left thats just gone in with half a tank of fuel just in case it helps Wink

Post #861965 16th Oct 2020 5:57pm
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lightning



Member Since: 23 Apr 2009
Location: Stockport
Posts: 578

United Kingdom 

Disconnect the MAF unit and see how it runs without it connected.

lf it's better then it's likely the MAF unit is the culprit.

Post #862004 16th Oct 2020 8:40pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 3924

MAF is reading low ie 38-40 at idle this reading low


MAF is reading idle 55 kgh ------------ 1.95 to 2.01 volts reading from new unit

also check air filter

Post #862037 17th Oct 2020 6:34am
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benspray



Member Since: 30 Jul 2014
Location: Norfolk
Posts: 51

United Kingdom 2006 Defender 130 Td5 HCPU Chawton White

Cheers will give it a go tomorrow, new air filter will be here Monday - one in there isnt too bad though but just giving everything a going over, only had it 6 weeks still sorting all the small issues Wink

Post #862147 17th Oct 2020 6:20pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 211

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black

I see you pushed the throttle quite hard twice. The second time you held the throttle a bit longer, and the exhaust cleared before you let off the throttle. Does it smoke if you push the throttle ‘slower’ but still gets high rpm? If no, I would say normal behavior.
Make sure you are not clearing sooth from the exhaust, especially if it was driven lightly. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

Post #862151 17th Oct 2020 6:44pm
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benspray



Member Since: 30 Jul 2014
Location: Norfolk
Posts: 51

United Kingdom 2006 Defender 130 Td5 HCPU Chawton White

not sure, I'll have to have a try Smile

I don't think it had done anything more than local running about for the past year or so, it was breathing quite heavily when I got it, that has now stopped after a few good runs so some of it could be down to short runs etc I guess Wink

I think theres a boost leak somewhere as well (you can hear the squeal) not sure whether its a hose or manifold at this stage but will all be checked over the next few weeks Smile Likely to get new boost hoses/intercooler and exhaust soon anyway.

Cheers

Post #862157 17th Oct 2020 7:11pm
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Lionel



Member Since: 12 Aug 2008
Location: Melbourne
Posts: 29

Australia 

You should check the possible boost leak. Such a leak would influence the fuel/air ratio, so that under hard acceleration the fuel supplied by the injectors would be greater than the air required so that unburnt fuel in the form of black smoke would be more than normal in the exhaust.

That said, the MAF readings are low, as pointed out by other posters.

Cheers,

Lionel

Post #862180 18th Oct 2020 2:29am
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roel



Member Since: 08 Aug 2009
Location: Lelystad
Posts: 1855

Netherlands 2003 Defender 90 Td5 PU Caledonian Blue

Low MAF reading should not give you too much diesel.

I would:

Check the air filter
disconnect the MAf
check for air leaks between the turbo and inlet manifold.

Is your turbo still working properly? Good power above 200o rpm? Roel

1984 90 2.5 na Diesel - RR V8 (1994-2001)
1997 Camel Trophy Discovery 300TDI (2001-2009)
2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts.
2003 90 Td5 (2009-now)

Post #862253 18th Oct 2020 12:47pm
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benspray



Member Since: 30 Jul 2014
Location: Norfolk
Posts: 51

United Kingdom 2006 Defender 130 Td5 HCPU Chawton White

Quick update new MAF fitted today, perfect 58-60 reading at idle, drives better and the smoke has cleared up Smile just a puff when it comes on boost then pulls clean.

Cheers all

Post #862805 21st Oct 2020 12:08pm
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