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Martin 01

Member Since: 13 Feb 2012
Location: East Yorkshire
Posts: 502

Running flat/ underpowered

Defender seems to be running rather flat with no sort of go in it.
Did the multimeter test on the MAF last night & seemed to be showing less than 1v at idle.
Borrowed a MAF from my friends TD5 that is running fine & fitted to mine but still seems to be running the same.
It had a new harness few months back when I serviced it & it had a new VDO fuel pump fitted few weeks ago.
Also recently cleaned the MAP sensor.

Anyone any ideas what to check for next ?

Last edited by Martin 01 on 5th Jan 2019 3:53pm. Edited 1 time in total

5th Jan 2019 2:22pm

Martin 01

Member Since: 13 Feb 2012
Location: East Yorkshire
Posts: 502

Just ran a test on the MAF with multimeter & it’s showing 2v and going up when revving the engine.
Obviously my MAF was knackered.
Still doesn’t seem as lively as when I had it mapped.

Will it have gone into a learning mode whilst mine was knackered ?
Had it unplugged for couple of days to, to see if that made any difference.

5th Jan 2019 3:52pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2166

Learning mode?

So youve driven it with the maf disconected? Any change?

Ideally you need it pluged into diagnostics.

How flat do you mean? Could be in limp mode. Instagram @defender_ventures
Empire Tuning - Agent

5th Jan 2019 4:00pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

are getting 12v supply to maf :?:

5th Jan 2019 4:16pm

Martin 01

Member Since: 13 Feb 2012
Location: East Yorkshire
Posts: 502

Yes got 12v coming in. It’s actually around 14 when running.
Is the only way to get it out of limp mode to get a diagnostic tool plugged into it & code cleared ?
Car does have a bit more go in it but doesn’t seem to go as well as when it was remapped by Alive.
Maybe need a quick trip to go see Gary @ Alive.

5th Jan 2019 4:54pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

quick trip to go see Gary @ Alive.

5th Jan 2019 5:12pm

Martin 01

Member Since: 13 Feb 2012
Location: East Yorkshire
Posts: 502

5th Jan 2019 5:47pm

drinkdrinkdrop

Member Since: 13 Sep 2016
Location: Surrey
Posts: 76

Wastegate actuator is worth checking with those symptoms

11th Jan 2019 10:57am

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4785

+1 for checking wastegate is moving freely

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

11th Jan 2019 5:52pm

Martin 01

Member Since: 13 Feb 2012
Location: East Yorkshire
Posts: 502

All sorted now thanks fellas

Fitted new MAF sensor & now showing 2v at idle.
Rang Gary @ Alive to arrange to take it in to be looked at.
Got to Alive & they checked everything over & all seemed good until he discovered my map had been wiped from the ECU when my local guy updated my software. Local guy thought he was doing me a good deed by updating everything after sorting my 3 amigos problem out.
Anyway Gary has restored my map with more updated version & now it's running like a dream again.
Has the oooomph back & pulls strong again.
Thanks for all of your advice, much appreciated

11th Jan 2019 8:28pm

roel

Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

A MAF is not only broken if it is dead. I had one that gave about 40% lower readings.

Reading your symptoms I don't think it is the MAF. But I don't know what else it can be. So borrow a Nanocom and do a test drive and look at the readings.

A td5 does not stay in limpmode. Everytime you start up the same problem has to be there to get in limp mode again. 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)

11th Jan 2019 8:29pm

Martin 01

Member Since: 13 Feb 2012
Location: East Yorkshire
Posts: 502

Read above my reply Roel.
Problem all sorted now with explanation above.

11th Jan 2019 9:59pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 933

2000 Defender 110 Td5 XS CSW Epsom Green

Oh that Roel, always behind the times

2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

11th Jan 2019 11:51pm

roel

Member Since: 08 Aug 2009
Location: Lelystad
Posts: 2039

Looks like we were typing at the same time.

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)

13th Jan 2019 6:09pm

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