C5 2.2 HDi Auto - High fuel consumption?

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

Post Reply
User avatar
Longyear
Posts: 31
Joined: 06 Sep 2012, 20:32
Location: Durham UK
My Cars: (15) Citroen C1 1.0i 12v Feel
(05) Citroen C2 VTS

C5 2.2 HDi Auto - High fuel consumption?

Post by Longyear »

Hi all,

I picked up a late 2002 C5 2.2 HDi Auto on Friday past. It was serviced in Jan, has no FAP related error messages (or others), and appears to drive beautifully, without fault . It idles smoothly and pulls cleanly.

Yet despite this, since resetting the average MPG when I got the car, I am only seeing an average 27 mpg. :( This has come from a mixture of urban and 'extra urban' driving. I know these cars are heavy and with the auto box was not expecting the most economical diesel on the planet, but I'd hoped for late 30s and others seem to achieve this. Today, I had a 60 mile round trip to make, so reset the fuel computer again and took it very easily (65mph on the motorway and smooth, quite slow acceleration). After the trip I checked the computer and I'd only averaged 31.5mpg. :shock:

When I bought the car on Friday, it was showing an average of 37mpg, but the last owner did say he "drove like a retired vicar running early".

Can anyone tell me any likely causes for such poor fuel consumption in an otherwise well-running car? ......... Is there something about 'swirl valves' or something (I have no idea what that is!) that can cause high fuel consumption?

Thanks in advance for any pointers! :)
David.
(15) Citroen C1 1.0i 12v Feel
(05) Citroen C2 VTS
steelcityuk
Posts: 1053
Joined: 03 Jul 2006, 21:51
Location: not applicable
My Cars: not applicable
x 1

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by steelcityuk »

Hi,

I can't say for sure about your C5 but the C5 I had, 2.0 HDi 110 manual would usually give 35mpg in an urban setting. According to some this isn't unusual. For comparison a XM 2.5 TD manual gave around 32mpg and a XM 2.0 TCT with LPG 18mpg in the same useage.

Steve.
not applicable
User avatar
Lighty
Posts: 1103
Joined: 07 Jan 2012, 16:53
Location: Derbyshire
My Cars:
x 34
Contact:

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by Lighty »

I would say, get the injectors checked, and get a remap with the fap removed, with al these done, you should get 40 mpg
http://www.marklightfootltd.co.uk
Dacia Duster 1.5 dci
Renault Twizy Technic
Citroen C15
Citroen Ami
vinypeps
Posts: 13
Joined: 10 Jul 2012, 19:50
Location: Northampton
My Cars: Peugeot 508 2.2 SW

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by vinypeps »

Before you do any of the above do a neck to neck check, top it right up with diesel and reset the trip meter to zero, then run it until it gets to a quarter or below, then fill it right up again at the same garage and pump if at all possible, then check the litres against the miles to give a accurate figure, it could just be a false reading on the computer thats giving the low mpg, I had a 2002 auto 2.2Hdi for 2 years and it averaged about 36 mpg on mixed driving, I did once get 47 mpg out of it on a round trip to Brittany.
Harlequin
Donor 2023
Posts: 912
Joined: 11 Jan 2006, 21:11
Location: Eastbourne , East Sussex
My Cars: Xantia Activa - one day I`ll own her again! Also miss my `old` 405 GLx4
2005 C5 3 Litre V6 Exclusive in Mauritius Blue and my 1997 Xantia Exclusive V6
x 23

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by Harlequin »

does it need a service?
Simon
User avatar
SaabC5
Posts: 765
Joined: 01 Aug 2011, 23:18
Location: SW London
My Cars: 09 C5 X7 2.0Hdi Exclusive
x 1

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by SaabC5 »

My 2.2 HDi manual only returns on average 29mpg around Central London, it will go as high as 60mpg on a long motorway run if i drive like a guilty vicar at a constant 60mph. If i drive "normal" motorway speeds 45mpg is quite normal so i would expect the auto to come within 3/4mpg of these figures.

Try some Wynns EGR3 cleaner into the EGR valve/exhaust manifold for starters and then consider other things like an air filter change and even a faulty MAF sensor.
09 C5 X7 2.0Hdi Exclusive in Perla Nera black (the best colour) :wink:
User avatar
Longyear
Posts: 31
Joined: 06 Sep 2012, 20:32
Location: Durham UK
My Cars: (15) Citroen C1 1.0i 12v Feel
(05) Citroen C2 VTS

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by Longyear »

Thanks for the suggestions guys.

The car was serviced in January, and had a new standard air filter as part of that.

I definitely plan a FAP removal and remap but it's probably about 3 months off at the moment, until funds allow!

I am sure that I should be getting more than an average 29mpg from this car based on what most of you have said.

@ SaabC5 - I've ordered some EGR Cleaner as someone else suggested that too. Can you give any starter advice on where the EGR is located on these cars/engines, and any tips of getting to it and cleaning it?

I already have some electrical contact cleaner in the garage - is it advisable to use this on these cars to attempt MAF cleaning? ... (I know some cars respond well to MAF cleaning, whereas on others, it's not advisable at all).

many thanks.
David.
(15) Citroen C1 1.0i 12v Feel
(05) Citroen C2 VTS
Peter.N.
Moderating Team
Posts: 11563
Joined: 02 Apr 2005, 16:11
Location: Charmouth,Dorset
My Cars: Currently:

C5 X7 VTR + Satnav Hdi estate Silver
C5 X7 VTR + Hdi Estate 2008 Red

In the past: 3, CX td Safaris and about 7, XM td estates. Lovely cars.
x 1199

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by Peter.N. »

Going by the previous owners figures that sounds about right for an auto, I drive like him and am only getting around 42 mpg and that's on mostly rural roads, that compares very poorly to my 406 2.0 hdi which does about 10 mpg better.

Peter
bxzx16v
Posts: 1696
Joined: 29 May 2011, 22:11
Location: Sheffield
My Cars: Past Frenchies , 4xBx16v,1xBxGti,1xBxTzd,2xZx Volcanes,1xZx reflex,1xPug 405mi16, 3x Xantia 1.9td's,1x Xantia activa, 2x Renault 25 V6 turbo, 1 Zx16v ,1 Pug 406 V6 coupe ,1x C8 , 1x Berlingo van , 1x Xanti 2.1td , 1x Renault Laguna 3
x 35

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by bxzx16v »

They are certainly not that economical the 2.2hdi mine struggled to get over 30 mpg in town , my 2.0 hdi 8v could manage 35 mpg .

Mark
2009 Landrover Freelander 2 TD4se (killed an Audi) , sadly now gone .
2012 Landrover Freelander 2 SD4 AUTO Love it . Now gone .
2014 Ford Bmax 1.0 Ecoboost Zetec . Fantastic little machine .Gone now.
2014 Ford Focus 2.0 Tdci Zetec S with the French heart.
Monkeyfeet
(Donor 2022)
Posts: 353
Joined: 08 Sep 2005, 14:37
Location: Beautiful Bedfordshire.
My Cars: C5:Hatch & an Esatate. Real cruisemobiles.
x 2

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by Monkeyfeet »

Hi,
They're not known for super economy, but my highest, on a m'way / dual carriageway run (120ish miles) was 60mpg. Drops to below 40 around town but normally maintains 42 / 43 mpg and that's over 2000 miles of very mixed driving.
Loves motorways, hates busy towns!
XantiaTD's(all gone). BXGTi, sold (sob). C5 2.2Hdi SE Exc Hatch. C5 2.2 Estate auto. Xsara Hdi estate. Yam YZF750, Zoom. GSX-S750, mmm.
HaydnR
Posts: 61
Joined: 07 Feb 2004, 17:18
Location: Burntisland, Fife
My Cars:

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by HaydnR »

I'm having similar problems with my 2.2 manual 32mpg a road short runs 35mpg 400 mile motorway run. E egr cleaner used and manually dismantled and cleaned, Fap removed, injector cleaner used. Lexia not showing any problems.
'02 c5 2.2 hdi exclusive
User avatar
Longyear
Posts: 31
Joined: 06 Sep 2012, 20:32
Location: Durham UK
My Cars: (15) Citroen C1 1.0i 12v Feel
(05) Citroen C2 VTS

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by Longyear »

Mmm, interesting. Not the most economical diesels in town then eh! :)

It's my own fault as I should have done my research first. But it is bizarre that my other car, a Skoda Octavia VRS 1.8T petrol, which is remapped to 205bhp, never drops below 34mpg average; so is currently more economical than a HDi diesel. That I would not have expected!

Going to try a MAF clean, and some BG244 and see if there is an improvement.

Cheers.
David.
(15) Citroen C1 1.0i 12v Feel
(05) Citroen C2 VTS
User avatar
SaabC5
Posts: 765
Joined: 01 Aug 2011, 23:18
Location: SW London
My Cars: 09 C5 X7 2.0Hdi Exclusive
x 1

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by SaabC5 »

Longyear wrote:
@ SaabC5 - I've ordered some EGR Cleaner as someone else suggested that too. Can you give any starter advice on where the EGR is located on these cars/engines, and any tips of getting to it and cleaning it?



many thanks.
If you remove the front half of the engine cover theres an aluminium pipe that runs out of the exhaust manifold, it goes slightly right and then to the back of the engine bay where it enters the EGR. The pipe is held on at the front by 2x 10mm nuts, just undo them and spray the cleaner down the pipe in short bursts towards the EGR valve. Also spray the opposite way into the gunky manifold, chances are you fill find a real heavy residue of black crud in the pipe going to the EGR. If nothing else you will find the car drives smoother and picks up better afterwards.
09 C5 X7 2.0Hdi Exclusive in Perla Nera black (the best colour) :wink:
Citroenmad
Posts: 8125
Joined: 04 Dec 2008, 22:08
Location: Northeast
My Cars: 07 Citroen C6 V6 HDi Exclusive - Red
07 Citroen C5 HDi VTR - Red
09 Citroen C3 1.4i VTR - Silver
01 Citroen Saxo 1.1i Forte - Mango Orange
93 Ford Mondeo 2.0i GLX
19 Hyundai i10
x 110

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by Citroenmad »

Check that the MAF is a genuine unit, cheap ones give poor economy - in my experience!

I know someone with an identical C5 to yours and it is doing the same MPG, its not got a genuine MAF and once it is swapped to one im pretty sure economy will be restored. This C5 did 32MPG on a good long run at 65mph, my two petrol Xantias are far superior ... 27mpg, even around town, it not acceptable for a diesel.
Chris
07 Citroen C6 V6 HDi Exclusive - Red
07 Citroen C5 HDi VTR - Red
09 Citroen C3 1.4i VTR - Silver
01 Citroen Saxo 1.1i Forte - Mango Orange
.
93 Ford Mondeo 2.0i GLX
19 Hyundai i10
User avatar
waynedance
Posts: 973
Joined: 29 May 2011, 22:56
Location:
My Cars:
x 8

Re: C5 2.2 HDi Auto - High fuel consumption?

Post by waynedance »

HaydnR wrote:I'm having similar problems with my 2.2 manual 32mpg a road short runs 35mpg 400 mile motorway run. E egr cleaner used and manually dismantled and cleaned, Fap removed, injector cleaner used. Lexia not showing any problems.
Forte Diesel Treatment work for me, see this post about half way down.

http://www.frenchcarforum.co.uk/forum/v ... =3&t=41206" onclick="window.open(this.href);return false;
Volvo S80 D5.........
C5 2.2HDi Exclusive 2003 manual (now gone).
2009 Renault Megane, the misses drive.
Had a 1988 BX 19TRS Auto many moons ago.
Forgive any spelling mistakes, it's the phone not me.
Post Reply