Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72787
Living without the FBH??
FBHs on both D3s are no longer playing, qualifying criteria well & truely met as both cars stone cold & temp below freezing, batteries good & half tank plus in them. Now the fbh faults on mine were cleared and it worked great 2 weeks ago however not any more.
If this is a case of once the dealer resets it and it works there, only to find it doesn't the next day, what are the implications re running without the FBH??? Not warming up as quickly is one I can live with. Anything else I should be aware of??
Apparently 80% of engine wear occurs during cold starting until an engine reaches nominal operating temperature - so the quicker the engine warms up the better.
I also suspect you'll find you're using more fuel as the engine will have to work harder to compensate. I know it sounds daft but I read somewhere (and it may well have been on here) that the extra the FBH uses when run normally is offset by the increased efficience of having an engine warm up quicker.
Interesting Matthias. I was always under the impression that the FBH was for our comfort only. That the engine did not give off enough heat from the dieseling process so it was added to bring the temperature up to our requirement for the car heating system. The engine runs quite cool, which is more efficient less waste heat and as far as I can remember the manual says start up and drive off not to leave it idling for a long period.
But then again I have been wrong before...... Regards, Trev.
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In the wilds of North Lincs or the middle of the North Sea.
Hi Trev - my comments above about "80% of the wear", aren't based specifically on the D3/TDV6 engine. This is information from before the Disco 3 existed when I was looking into how to prolong the life of another diesel engined car, and I think it's also what Kenlowe used to quote for the electric pre-heaters they did/do.
You would have thought that it wouldn't be hard to get right but here we are with conflicting information from different sources......
A bit like "run the guts out of the engine when you run it in" to get the best from the engine. Probably correct but takes some getting used to especially when you have 35 years of "take it easy when running in"..DOH! Regards, Trev.
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In the wilds of North Lincs or the middle of the North Sea.
1st Mar 2010 4:48 pm
PaulP
Member Since: 04 May 2007
Location: Barcelona
Posts: 4317
I think the main function of the FBH is due to the inefficiency of diesel engines when cold - especially the TDV6 which seems to struggle to get up to temperature quickly (as mentioned) in cold climate conditions. Surely this means that it is inefficient as it is too efficient?
The idea is that the FBH brings the coolant temp up to correct operating temperature as quickly as possible to reduce emissions.
In part I'm sure it's also a (marketing) "feature" to keep us toasty warm, but I think the hard facts are mainly to do with emissions from cold start etc 2006 Discovery 3 TDV6 SE AutoBuckingham Blue 2007 Golf GT DSG
Paul,
The lower the temperature that the dieseling takes place within reason the lower the wasted heat and the higher the dieseling efficiency. Heat is a waste by product of the chemical to mechanical energy conversion so the lower engine temperature is good for efficiency but not so good for us when it's cold. Petrol engines run at a much higher temperature and have a much higher temperature gradient at start up and I would suggest suffer much more if not warmed up properly. Regards, Trev.
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In the wilds of North Lincs or the middle of the North Sea.
Having had 2 D3's in the last 4 years and only now got the FBH working on the latest one I can say I had not noticed anything detrimental at all !!!!!..........
If anything now mine is smoking like a goodun I appear to be using more fuel
1st Mar 2010 5:43 pm
PaulP
Member Since: 04 May 2007
Location: Barcelona
Posts: 4317
TSR2 - can you say that again in English? I've read your message three times and still don't understand anything
So you're saying that the FBH is not there to improve emissions in the 10 minutes following a cold start situation? 2006 Discovery 3 TDV6 SE AutoBuckingham Blue 2007 Golf GT DSG
1st Mar 2010 5:53 pm
ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15214
Re: Living without the FBH??
DSL wrote:
If this is a case of once the dealer resets it and it works there, only to find it doesn't the next day,
Exactly what happened to my FBH !!
So, what is the reason for this - is it diesel gunk in the system?
and more importantly,
what is the cure - is this a Faultmate & purging job ?I was a normal heterosexual chap, but in these new woke awakenings I now identify as a Wardrobe.
1st Mar 2010 6:02 pm
dick dastardly
Member Since: 29 May 2007
Location: wiggleigh bottom
Posts: 1112
Having a warm engine reduces internal friction considerably, so reducing engine wear and improving fuel efficiency.There's one wheel on my wagon, but i'm still rollin' along, it's the cherokee, they're after me, but I'm singing a happy song
1st Mar 2010 6:09 pm
Gareth Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26701
I would be looking at the fuel supply.
However, apart from following the pipe back from the heater, I have no idea where to look, or what to look for.
Maybe there is a filter thats blocked, or the fuel pump is faulty, or has a loose connection, or there is a split in the pipe somewhere letting air into the fuel supply. Loads of possibilities really, any of which could lock it out.
1st Mar 2010 7:16 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72787
Thanks for the above!! The only one that concerns me is engine wear. I don't give a monkeys re emissions, I'm running on MTRs in the snow & ice so mpg is crap anyway, a little more crap is not an issue. The car warms up fine in 3 or 4 miles at 60mph so comfort is not an issue, not with heated seats & steering wheel
Now re extra engine wear, does this mean if the FBH was not doing it's stuff then the engine will pack up at 299000 miles instead of 300000, then i'm not worried. If however it's going to pack up at 75000 rather than 80000, that's a matter for concern! What, in practice, does a little more cold running mean?? Considering the FBHs worked fine last year I can consider the "extra wear clock" to have just started.
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