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WendyTheTruck

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

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

14th Apr 2021 6:25pm

MadTom

Member Since: 10 Sep 2013
Location: Olomouc
Posts: 622

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

15th Apr 2021 1:51pm

4RF RDS

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

2000 Defender 110 Td5 XS CSW Epsom Green

As above... faults cleared due to now voltage and runs better.

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)

18th Apr 2021 2:46am

benniferj

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

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

18th Apr 2021 7:37am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20376

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. $W33T $0U7H3RN $UG4R
🇬🇧🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁷󠁬󠁳󠁿🏴󠁧󠁢󠁳󠁣󠁴󠁿🇮🇪🇺🇸⛽️🛢️⚙️🧰💪

18th Apr 2021 1:42pm

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

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.

21st Apr 2021 11:39am

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