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WendyTheTruck



Member Since: 25 May 2014
Location: Warwickshire
Posts: 14

United Kingdom 2003 Defender 90 Td5 HT Epsom Green
Truck runs better after battery died - discuss..
Hi all,

I've noticed recently my truck runs much better (more torque, more power, less smoke) directly after the battery has run flat. I'm thinking there are some adaptions in the ECU that get reset when the battery dies. They then "learn" some duff values over time.

Ring any bells? Any thoughts on what the cause of the duff adaptions might be? Gummed up air meter perhaps?

Interested to hear if others have experienced similar.

Thanks
Post #898254 14th Apr 2021 6:25pm
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MadTom



Member Since: 10 Sep 2013
Location: Olomouc
Posts: 556

Czech Republic 1999 Defender 130 Td5 HCPU Baltic Blue
Not adaptations, but possibly some engine limp mode after some faults. With battery out, faults are cleared and so the limp mode. Both can return later. Partly faulty MAF of sticking turbo wastegate are not uncommon for TD5. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo Smile
Post #898438 15th Apr 2021 1:51pm
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
Posts: 890

Canada 2000 Defender 110 Td5 XS CSW Epsom Green
As above... faults cleared due to now voltage and runs better. Thumbs Up 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)
Post #898823 18th Apr 2021 2:46am
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benniferj



Member Since: 20 Oct 2016
Location: Basingstoke
Posts: 361

United Kingdom 2003 Defender 110 Td5 XS CSW Oslo Blue
Confirm the suspicion by plugging it up to Nanocom at the point where you think its running at its lower power, see what faults you have. Insta: @thebenjordan4x4
Post #898833 18th Apr 2021 7:37am
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19452

United Kingdom 
A duff battery will cause the alternator to constantly keep charging too which will add more constant load to the motor all be it little.
On my old battery I was getting around 14.4v charging now it’s around 14.7 / 14.8v with the battery changed.

I’m not sure if the TD5 alternator is the same design as the TDCi but when up to voltage on the Puma it free spools which means no load / little load on the engine.
The added load is going to reduce performance in a small amount, very similar as to when the AC compressor is active if fitted. Diesels Lives Matter. ⛽️🛢️👨‍🔧🧰⚙️
And if You Love the Country, then we’re on the same side ~
I got’ love for Britain, I got’ British pride’. 🇬🇧
Post #898868 18th Apr 2021 1:42pm
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geobloke



Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4350

United Kingdom 
Unfortunately no the TD5 alternator is a simple affair albeit with the vacuum pump sat on the front of it and it is loading the engine constantly. So is the Puma alternator on a clutch type mech like an AC pump?

Having just replaced two 10+ year old batteries I can attest to the difference the new ones make as it revs a little lower at idle, so less voltage required and so less load on the engine.
Post #899313 21st Apr 2021 11:39am
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