Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Hi, I've recently bought a diesel Peugeot 807 because I couldn't afford to run my very juicy 2 litre petrol automatic Mondeo. But guess what?! The Peugeot is just as bad!! I'm getting 24mpg, but apparantly I should be getting about 40! I've had a look round the internet and a few things to check seem to be air filter, tyre pressures and timing, but would any of these really cause such a dramatically poor mpg? Does anyone know what it might be?

Peugeot 807 - Peugeot 807 diesel poor mpg - piston power

When was it serviced last? A dirty air filter restricts air supply and allows more fuel in which in turn runs poor.

A clean air filter and fuel filter should do the trick 90% of the time.

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Really? But would that cause such a significant difference?

I've had the car only a few weeks, it came with no service history but the digital thing says there's 4000 miles left to next service - maybe I should just get it done anyway? Is air filter and fuel fiter part of an ordinary service?

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

The official urban figure for the vehicle is 30mpg the combined figure is 40mpg,you will never ever match these figures.A 2.0hdi 807 normal urban driving is going to be around what you are achieving.Its a big bus as aerodynamic as a brick meant to be run full of people on an airport run which would make it quite economical per person but as a normal vehicle I can think of more economical vehicles.As Bigtee states its needs to be in tip top condition as far as service is concerned to even achieve what you are already doing.The wrong tyres on these will reduce consumption enormously these vehicles won the golden carrot award by AutoBild in Germany last year I will leave you do work out what that means.

Peugeot 807 - Peugeot 807 diesel poor mpg - piston power

If that is 4k to go to the next service & i suspect that is a 20k service yes get it done asap & check for dragging brakes which can happen and does when loaded the weight valve can apply more pressure to brakes.

But lets not go too deep into what could be etc, Start with a good service then take it for a good blast up the motorway & i want you to drive it like you stole it,This means take the revs high through the gears and preferably hold in 3rd a little longer then forth.

This is called the "italian tune up" and does wonders to a engine lets say it blows the cobwebs out.!

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Andy you've really put me off now :-( looks like I bought the wrong thing. I looked for about two months - mostly at Galaxys, Sharans, Alhambras - didn't find a single nice one in my price range - all been round the clock, tatty inside etc. Found a couple of nice Espaces but I much preferred the Peugeot inside. But from what you're saying it isn't a sensible family car :-(

I will try what you said, Bigtee - thank you very much - but to be honest I wonder if I should sell it on and get something else. It doesn't sound like I'll ever get much to the gallon. Going on those figures Andy what should I be averaging on a full tank? The 24mpg I quoted was worked out from a full tank - mostly 10-20 mile journeys on dualcarriageways. I use it round town a bit, and hardly ever on motorways.

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

It depends what you bought the car for if you need all the room then you are going to have to pay one way or another but if you bought it purely as a car for yourself its a going to be a bit pricey per person to travel in.But try what Bigtee suggests before you make any hasty decisions.

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Well I need a 7 seater yes, and it was the best one I found, but I honestly thought it would average around 40mpg :-(

I'll get it serviced and see if it improves. Thank you so much guys.

Peugeot 807 - Peugeot 807 diesel poor mpg - Peter.N.

There are some Pegeot 406 seven seaters with the 2.1 diesel for not a lot of money, they would give you a much better MPG and probably go better.

Peugeot 807 - Peugeot 807 diesel poor mpg - Railroad.

It's a big heavy car and I'd be amazed if you consistantly achieved 40mpg. As well as servicing and maintenance the biggest factor concerning fuel economy is the type of journeys you do and the way you drive. Don't expect good MPG if you mostly do short trips or drive with your foot to the floor. Most people who own diesels usually like to exaggerate how good on fuel their cars are. I have a diesel and if I drive very steadily on a long run it is possible to see 60mpg. But my everyday average is actually more like 42mpg. That just illustrates how people often cherry pick.....

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Thanks for the replies.

We've just been out, and on the way home the car suddenly went weird - it really lost power. I mean like I put my foot down and it hardly did a thing - foot right to the floor, rev counter up to 3-4000 and it just picked up reeeeeeeeeeeally slow - like there was hardly any acceleration. What does that sound like? Do you think it's connected?

Peugeot 807 - Peugeot 807 diesel poor mpg - Railroad.

In that case firstly check to make sure the air intake hoses haven't fallen off or have split, especially from the turbo to the inlet manifold. Assuming they're all ok the fault could lie with the Mass Air Flow (MAF) sensor, Turbo Boost Sensor or Turbo itself.....

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Right, ok, now I just need to find someone to look at it lol. Are any of those things really expensive? I guess the turbo itself would be. And would any of those things cause the poor mpg as well as the loss of power?

The strange thing is that the loss of power isn't there all the time. It just suddenly happened tonight. It did happen last night too but I was almost home and sort of thought I'd imagined it, but now it's done it again :-( It was fine this afternoon though so it's intermittent.

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

You are starting to find out why they won the golden carrot award.If it is not a pipe dropped of then more than likely the turbo is going or gone very expensive to put right.

Peugeot 807 - Peugeot 807 diesel poor mpg - dieselnut

It's quite likely that this engine has a DPF Diesel Particle Filter fitted plus the Eolys fluid.

The filter gets blocked over time, especially if used for short trips.

As Bigtee advises, take it for a good thrash on the motorway, keep in a lower gear so revs are above 3000 for at least 10 minutes. This will help burn out any particle deposits.

If you check the VIN you should be able to find out if it has a DPF.

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

I am pretty sure it does not have a DPF.

Peugeot 807 - Peugeot 807 diesel poor mpg - piston power

These recent problems spell poor servicing to me so better whip it in and get it done.

Also a diesel needs a good oil supply to the turbo for it to work! more important it gets lubrication to the bearings, So what im saying in plain english is to change the engine oil and filter regular every 6 months to be better or at least every 6k.

Lots of turbo problems is poor oil supply and the bearings either seize or the seals blow.

That problem you had with no power seems like fuel related air in fuel line might be poor fuel pipes which need replacing at filter or "O" ring seals if these have them.

Im not trying to scare you far from it but you don't know how the last owner treated it do you?, So treat it as you have no idea and have a full service done either at dealer or a v good indie then take for a blast as said earlier to clean out the DPF if fitted.

Do let us know how you get on it's nice to know if we have been some help or not.!!

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Thanks everyone. I totally wish I hadn't bought it now. I'm a single mum and skint so if the turbo's gone I'm stuffed! I spoke to my (not very helpful) ex who's a mechanic and he said it might be the fuel filter or a turbo pipe so he's going to do those next week; he hasn't got time til then, so I'll post back and let you know. Hopefully he'll service it for me too.

Edited by smspencer on 02/08/2010 at 21:19

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

Lets hope its good news

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Just done the motorway thing, and it didn't work :-( At least I know it's not that though I suppose. It ran fine for about the first 20 minutes, then once it was well warmed up it lost power again so I drove it home like that. A couple of times it felt like it was about to go if that makes sense - I could sort of feel it bite like it wanted to go but couldn't. I'm worried it's the turbo now :-( It isn't smoking though - that must be a good sign?

Peugeot 807 - Peugeot 807 diesel poor mpg - piston power

You do the "motorway thing" after the full service when all the parts are clean and fresh air is blasting through the engine not dirty clogged stuff.

Be extra nice to your ex after all he's doing it for next to nowt.. lol...............

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer
lol I should be so lucky!
Peugeot 807 - Peugeot 807 diesel poor mpg - piston power
lol I should be so lucky!

http://www.sing365.com/music/lyric.nsf/I-Should-Be-So-Lucky-lyrics-Kylie-Minogue/268198475487BAFC48256A6300226A4A

Ok instead when he services the car you can sing the above. lol...................

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Took the car in today for a new fuel filter. When they took the old one out it was really black and they said that could be the problem. Drove it and after 20 miles the same thing - big loss of power. He also looked at the turbo pipes and stuff, and said there was some oil there and a couple of connections were loose which he tightened, but it obviously wasn't that either. He said he doesn't think it's the turbo as there's no smoke. Anyway what I'm wanting to know is do you think the fact that it only does it after about 20 miles ish is significant? It's absolutely fine until then, then it just goes and stays gone. No smoke, no warning lights. I also asked him about the mass air flow thingy - he said he checked it and it's fine.

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

Try www.peugeotforums.com they might be able to give you a correct answer there is a section devoted to 807's

It still dounds like it is going into limp home mode

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Thank you - I will post on there.

I don't think it's going into limp home mode because doesn't that restrict the revs? It isn't doing that - it just accelerates really slow - kind of feels like the handbrake's stuck on.

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Sorry it's me again. I wondered if there's anyone around that could just answer a quick question as I've got to get back to the garage asap.

They've done diagnostic check on it - it came up with additive low and turbo pressure fault. They've looked at eolys fluid and there's none there (or very little) so they've said it needs refilling, but also that the filter is obviously blocked (or cat as he called it) and that's why it's going into limp mode and giving the turbo pressure fault code. BUT I've had no warnings on the dash at all. Is this possible? I don't want to spend hundreds on the filter if it doesn't need doing and I'm still going to be left with a problem. Surely there should be warnings on the dash? I've only had the car a few weeks so could someone have disconnected something or wiped the warnings??

Peugeot 807 - Peugeot 807 diesel poor mpg - dieselnut

I had a C5 with DPF & Eolys system.

There was a pressure sensor located on the bulkhead with 2 rubber pipes that connected to either end of the cat/DPF filter which measures the differential pressure accross the filter. When the pressure reaches a pre-determined level it will trigger the alarm message on the dash.

If one of the pipes becomes detached or leaks or the pressure sensor fails then no message.

On the C5 you can detach the DPF from the cat ( 3 nuts ).

Once off the car it can be jetted clean with a high pressure water jet, then once dried out re-fitted to the exhaust & good for another 50k miles.

Eolys used to be about £25/litre from Peugeot/Citroen dealer.

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Oh I've never heard of cleaning it and putting it back. Hmm, maybe worth thinking about. I just find it very strange that the eolys fluid has run out and the filter is blocked, but there are no warning messages. Worried that after spending hundreds I'll still have a problem. Oh well, I'm sick of the whole b***** thing now! Feel like smashing it to pieces lol. Thanks anyway though.

Peugeot 807 - Peugeot 807 diesel poor mpg - rtj70

Just so others know - you cannot wash a DPF! The cars with the eolys fluid have a FAP filter and these apparently can be washed. A DPF has a catalyst built in that is used to burn off the particles at high temperature.

Don't want anyone thinking a DPF can be pressure washed do we.

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Well yes I sort of thought it sounded a bit too good to be true!

Does anyone else know if my Eolys could have run out and my DPF be blocked, but have no messages?

Peugeot 807 - Peugeot 807 diesel poor mpg - dieselnut

FAP is just the name Cit/Pug give to the system, it is still a Cat & DPF bolted together.

To enable cleaning or exchanging they have made it detachable from the Cat.

Because it is located under the car some 2/3 feet from the exhaust manifold they have had to add the Eolys fluid so that the particles will burn at a lower temperature.

The exhaust gas will have lost some heat by the time it reaches the filter.

Modern systems have the Cat/DPF located on the manifold to avoid this.

Your garage have told you there is no Eolys, the filter cannot regenerate (clean) itself without the Eolys as it can't get to a high enough temperature.

So the filter will now probably be completely blocked & need either cleaning (about 1 hours work) or replacing with an exchange filter. (half hours work & several hundred pounds for an exchange filter)

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Yes, it's going to be about £400 altogether which is far cheaper than other places so I'm lucky in that respect.

I just want to know why there are no warnings on the dash though.

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

First of all does it have one I think not and that is not the problem don't get carried away.

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Yes, it has one, and the fluid is empty, and because the fault is saying 'turbo pressure' it apparantly points to the dpf being blocked. I hope it's that because I've told them to go ahead and do it now. Just worrying that there were no warnings.

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

If it has got one it has but according to the specs a 2.0hdi 120 does not have one 2.2hdi does but specs can always be wrong.But I hope it does and that is your problem solved you have suffered enough.

Peugeot 807 - Peugeot 807 diesel poor mpg - Enginostics

Hi, just reading through all the comments. My advice would be to get the fault codes read and live data read before you start changing parts. You need a fuel injection specialist to have a look at it.

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Andy, how can it not have one? Where does it say it doesn't have one?

I thought I had got the fault codes. The garage plugged their thing in and then rang Peugeot, and Peugeot said the empty Eolys plus the additive fault code points to the DPF.

I wish I hadn't bought it :-(

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Just to let everyone know - got the car back today. It's had the eolys fluid topped up, the DPF changed and a service. The DPF actually had bits falling off it so I guess this is what was causing my problem. I've taken it on a good run and it seems fine, so fingers crossed it stays fine! It also feels much nippier. Total cost was £700 which sounds absolutely loads but Peugeot quoted £1300 just for the eolys and the DPF.

Thanks to everyone who replied to me.

Peugeot 807 - Peugeot 807 diesel poor mpg - Collos25

I am really glad you have at last sorted the problem out £700 ouch thats a lot of money I hope you have many years of trouble free running. You will be an expert on HDI engines now we will come to you for advice in the future.

Peugeot 807 - Peugeot 807 diesel poor mpg - dieselnut

Pleased that this is sorted for you now although I am a bit worried as you were that you had no alarm message.

I am thinking that the previous owner may have disconnected something to avoid the alarm message from appearing.

Did your garage find anything?

If that is the case then problems could return if the system doesn't try to regenerate the new filter as it becomes blocked.

I hope that I am just being pessimistic & you have many trouble free miles.

The filter needs changing & Eolys replenished at either the next 50k or 80k miles depending on the model year.

Peugeot 807 - Peugeot 807 diesel poor mpg - smspencer

Oh right, yes, maybe it isn't regenerating like it should be - oh no, what a horrible thought :-( I was thinking that it just hadn't been looked after - no services, no eolys fluid left etc, but maybe not :-(

 

Ask Honest John

Value my car