 | Home > Td5 > Defender Low range ECU map |
 
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2187  
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Are you certain its dropping into the low map and the ECU not seeing overboost? Overboost wont always show the EML if its been mapped.
Unplug the MAF and see if it does the same Instagram @defender_ventures Empire Tuning - Agent Last edited by bankz5152 on 22nd Feb 2019 8:01pm. Edited 1 time in total |
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22nd Feb 2019 7:42pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6112  
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Sounds like it's possibly overboosting and then going into limp mode
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22nd Feb 2019 7:47pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4793 
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+ 1 for over boost
 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 |
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22nd Feb 2019 10:34pm |
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| mturri Member Since: 13 Jul 2010 Location: All over Posts: 33  
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+1 with overboost being the cause as turning engine off resets it.
For all I know overboost will never trigger EML/MIL on the Td5, though a fault code should be logged to ECU memory. Have you perhaps shortened the turbo wastegate actuator rod a bit too much? Or what other mods are you running. Have you checked the hose (~1/4" OD) going from downstream of the turbo (off the steel pipe) to the wastegate actuator is in good nick? If hose leaking or partially blocked then actuator won't operate as per design leading to frequent overboosting. If a case of overboosting then should be able to correspond performance drop with intake manifold pressure going over boost limit (typically 142 kPa above atmospheric pressure baseline) by monitoring MAP real time via Nanocom or similar. BTW there is no such thing as 'a' low range fuel map. There are low and high range versions of driver demand, smoke limiting and torque limiting maps, the use of which is solely based upon transfer case range selection. Transfer box position is constantly looked up during the fuelling calculation process (any time engine is on basically) and to my knowledge there is no provision in the code to switch to using any of the low range maps other than when low range is actually/physically selected. 24 yrs of Td5 ownership D110 Td5 MY06 fully tuned up ex-D2 Td5 MY04 Auto ex-D110 Td5 MY00 ex-D2 Td5 MY00 ex-D2 Td5 MY99 ex-D1 300Tdi MY89 ex-D90 200Tdi MY87 |
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23rd Feb 2019 12:58am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2909
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It can’t be overboost
It will default into the “more progressive power mode?” if you quickly stamp on the accelerator while the engine is idling, so it doesn’t even have time to rev up. Then it will stay that way until you turn off the ignition. In this mode it will still do 80 mph and it will still overtake, but it’s definitely a more gentle application of power on the throttle, as you’d want maybe in low range, and maximum power is not quite as good. Last edited by lightning on 23rd Feb 2019 8:50am. Edited 2 times in total |
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23rd Feb 2019 8:44am |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4793
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Have you tried disconnecting the range switch on the transfer box? 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 |
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23rd Feb 2019 8:45am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2909
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No, l’ve not done that.
It’s running a mild (25bhp approx) remap, but it was the same before that was done. The turbo wastegate rod has not been adjusted it’s at the standard length. |
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23rd Feb 2019 8:48am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17539 
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Could be a faulty track on the throttle pot triggering limp mode.
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23rd Feb 2019 11:37am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2909
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Good thought, l had the same idea, but l’ve put a brand new pedal assembly on and it made no difference!
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23rd Feb 2019 12:32pm |
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| Col Member Since: 16 Jul 2014 Location: Somerset Posts: 7 
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I will be watching this thread closely as my 2003 does exactly the same thing.
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23rd Feb 2019 12:33pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2909
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Our 2006 did it from new, until we sold it at 45,000 miles. My 2005 110 has done it since l bought it in 2014 but our 2003 90 didn’t.
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23rd Feb 2019 4:51pm |
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| Col Member Since: 16 Jul 2014 Location: Somerset Posts: 7
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One other observation I've made is that when I'm towing my trailer @ 3.5 tonnes & using full throttle up hills and alike, it seems to be fine. It's when solo & accelerate hard with full throttle it does it. The throttle then becomes less responsive as it does when in low range, and stays like it until the engine is re-started. So, it seems to relate to when the engine revs rise rapidly without very much load. ?? Weird.
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23rd Feb 2019 6:03pm |
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| achuakh Member Since: 12 Apr 2012 Location: Singapore Posts: 160  
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plug that on to diagnostics to find out what fault it's throwing. if you don't have one, get a nanocom.
As you mentioned this car has had some "modifications" to the fuel map..... if it's driver demand, it's possible your map has a value outside of the range when you put your foot down which will show up as driver demand error (assuming your throttle pedal is 100% working in good condition). I've written maps which get this error if there's something i didn't take care of and then this fault is logged and everything feels sluggish after that till i restart it. the error will stay until cleared but the performance will be good, until i do the same thing to trip up the error. the other thing mentioned would be overboost. if this happens, it can also cause this, but depending on how severe the overboost was and for how long. this will log the turbo charger over boost error. From the land of the most expensive land rover defenders on planet earth. At �125k for a XS 110 csw and you get to own it only for 10yrs! Please find me a good reason to stay on this island. |
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25th Feb 2019 12:38pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2909
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Thanks for the information, it sounds like that could be the issue, although it did it from new.
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25th Feb 2019 5:25pm |
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