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sandylands

Member Since: 07 Nov 2012
Location: uk
Posts: 19

thought my troubles were over...

Hi all again, I recently posted about changing ecus due to rough jerky driving. I opted for a nnn ecu remaped off the dreaded bay and wohooooo my td5 actually drives properly now, much smoother and fluid than before no jerkyness or flat spots, all great until i went to start it the following morning. it turned over more than usual then started and stall then on re start it missed when using throttle (tick over is perfect without throttle no smoke either) and throw diesel smoke out for roughly 20 seconds. After this 20 seconds she purrs like a kitten. normally i would start checking glow plugs, maf, map all kinds of lovely sensors but when the original msb ecu is used she fires up perfectly. What gives?? what can an ecu map give rubbish starting but perfect driving once warm for 20 secs?? no faults show at all, i disconnected temp sensor which gives me a much longer glow plug time but that only seems to make small difference. surely other people operate nnn ecus on pre 2002 defenders with good results. any ecus gurus know what this is likely to be??
oh and merry christmas and a happy new year to all

29th Dec 2013 4:26pm

RobKeay

Member Since: 19 Jul 2009
Location: Stafford
Posts: 1579

2014 Defender 110 Puma 2.2 USW Corris Grey

Have you checked there is no oil in the loom??

29th Dec 2013 6:12pm

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

Or injector seals and washers? When my seals first started to go I found it hard to start in a morning but once the engine was running it seemed to run fine. Try doing the fuel purge before starting and see if it's starts better this could be your problem.

29th Dec 2013 6:50pm

sandylands

Member Since: 07 Nov 2012
Location: uk
Posts: 19

I'll try the fuel purge tomorrow, I did first think about the seals but why would it start with the old ECU happily?? I do have the maf disconnected as its dead and has been for a year or so, my mate just suggested that because maf is disconnected then the ECU is looking for the values hence the 20second rough running at start up then it just switches to default hence the perfect running after the 20secs. Anyone else experienced this?

29th Dec 2013 11:00pm

party monkey

Member Since: 31 Dec 2010
Location: Oxon.
Posts: 1311

2005 Defender 110 Td5 XS CSW Cairns Blue

Did you have any need to reprogram injector codes when you switched ECU ? I seem to recall that the codes are on the injectors and the data in the ECU needs to be matched.

What I'm not sure about is if that is just an issue with swapping like for like flashable later ECU's and whether it's less important when 'upgrading' Jon - 110 td5 [sold]. Currently Defenderless.

29th Dec 2013 11:13pm

Lou Sparts

Member Since: 15 Apr 2012
Location: Kent
Posts: 1501

2005 Defender 90 Td5 XS CSW Zambezi Silver

Hi Sandylands,I had a problem with my MAF a couple of months ago and disconnected it a few times as a process of elimination and when i disconnected it it ran rough for a short period on very reduced power then ran great, i also assumed the ECU was looking for MAF readings before switching to a default setting.

I bought a new MAF from BAS and the problem was solved,I would fit a new MAF before looking to far for other problems. 2005 Td5 90 XS

Steve

30th Dec 2013 7:11am

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

I think if I knew the maf was dead a year ago, I would have changed it straight away. Especially if I was having running problems

30th Dec 2013 11:02am

sandylands

Member Since: 07 Nov 2012
Location: uk
Posts: 19

Thanks Lou sparts that's what I wanted to hear, a new genuine Maf from island 4x4 is on its way so fingers crossed. Mk1 collector I totally agree, I only never bothered as I was told by what I originaly thought to be a very experienced landrover specialist that a Maf only controlled egr and was pointless connecting it as mine is blanked. It's literally horrifying to know how many people trade as a specialist and know so very little. Also all injector codes have been changed over, as I said it runs the best I've known a td5 run once the starting issue clears.
Thanks again all for the replys

30th Dec 2013 1:08pm

sandylands

Member Since: 07 Nov 2012
Location: uk
Posts: 19

Happy New 2014. So I fit the new maf and the problem still remains. Obviously as the msb unit starts the car but drives awful and the nnn drives lovely but won't start it properly then I can only think it's a mapping fault rather that sensors. Surely a failed sensor would be failed on both ecus? I'm told that an msb ecu will always be better for an early engine although I don't no why. So my msb has a chip in it and td5 inside will do me a replacement chip. My question is does the chip actually change things like throttle response or does it just boost power?

2nd Jan 2014 8:23am

Zinke

Member Since: 27 Jan 2009
Location: Scunthorpe
Posts: 670

If its ECU related then i would go talk to Gary at Alive, hes very good with TD5 ECU's and will probably sort you out a NNN ECU to run correctly on your Defender.

Pete.

2nd Jan 2014 7:09pm

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