406 Hdi fuel consumption

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

Moderator: RichardW

User avatar
Paul-R
Donor 2023
Posts: 6916
Joined: 07 May 2009, 16:24
Location: Wirral, NW England; Vaucluse 84, France
Lexia Available: Yes
My Cars: 2015 1.6 Blue HDi 120 Peugeot 308 Active SW
2013 2.0 HDi 163 C5 Exclusive Tourer
2003 2.0 HDi 110 C5 Exclusive Estate (Gone)
2001 2.0 HDi 90 Xsara Estate (Gone)
x 1369

Re: 406 Hdi fuel consumption

Post by Paul-R »

Is there any scope for swapping the mafs around to see if the "good" fuel consumption follows the maf?
As I get older I think a lot about the hereafter - I go into a room and then wonder what I'm here after.

Inside every old person is a young person wondering what the hell happened.

"Trying is the first step towards failure" ~ Homer J Simpson​
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: 406 Hdi fuel consumption

Post by Peter.N. »

The fuel consumption improves on both cars if I disconnect the MAF's although the performance drops off on one of them. I am going to test the MAF's when I get a minute, one of them came off my scrap car that was doing 60 mpg.

Peter
harryp
(Donor 2022)
Posts: 687
Joined: 07 May 2011, 16:03
Location: Telford, United Kingdom
My Cars: Forte HDI 110 hatch in wicked red, SORN
Exclusive HDI hatch in quartz, SORN
C4 Picasso Exc E, Wifes
Peugeot 207cc
x 73

Re: 406 Hdi fuel consumption

Post by harryp »

Peter, I too drive with a light foot and have (presumably) blocked the EGR as a result. How have you avoided this happening? Foot to the floor occasionally left a huge black cloud behind, the result I believe of carbon from the catalyst due to it not being hot enough to burn it off. When the welds either side of the catalyst went, I was able to tap it onto a hard surface each end and was surprised at the mounds of carbon piled up from either side. Another job to do before it goes back on the road :wink: . A very interesting thread and looking forward to the outcome :) .
Regards, Harry

2000 Nov Forte HDI 110 hatch in Wicked Red; currently SORN
2000 Mar Exclusive HDI hatch in Quartz; currently SORN
2013 C4 Picasso Excl E
Peugeot 207cc 1.6 Roland Garros
User avatar
white exec
Moderating Team
Posts: 7445
Joined: 21 Dec 2015, 12:46
Location: Sayalonga, Malaga, Spain
My Cars: 1996 XM 2.5TD Exclusive hatch RHD
1992 BX19D Millesime hatch LHD
previously 1989 BX19RD, 1998 ZX 1.9D auto, 2001 Xantia 1.8i auto
and lots of Rovers before that: 1935 Ten, 1947 Sixteen, 1960 P5 3-litre, 1966 P6 2000, 1972 P6 2000TC, and 1975 P6B 3500S
x 1752

Re: 406 Hdi fuel consumption

Post by white exec »

Is a blocked EGR necessarily a problem, NOx aside?
Chris
ekjdm14
(Donor 2020)
Posts: 1810
Joined: 19 Jan 2015, 17:42
Location: Congleton
Lexia Available: Yes
My Cars: '95 Xantia 1.9D automatic - 109k one of two remaining
'03 206 GTi180 - 97k in pieces being brought back up to snuff
'03 206 1.9TD - home-built veg-fuelled B-road bruiser
'99 306 SE 2.0i cabriolet - 92k awaiting service work ready for next summer
'97 306 XS 1.6i 3 door, Bianca White, from dead 12 years & seized solid to road legal in 7 days
x 212

Re: 406 Hdi fuel consumption

Post by ekjdm14 »

white exec wrote:Is a blocked EGR necessarily a problem, NOx aside?
Blocked is not a problem, the problem is they tend to not fully block but stick partly open which then causes excessive recirculation and (as far as I can tell) a massive boost leak straight out of the exhaust... Hence the power drop/drivability issues that arise from EGR faults
'95 Xantia LX 1.9D-auto, Black, 109k
'03 206 GTi180 94k in surgery
'03 206 1.1S XUD9TE/veg project :mrgreen:
'99 306 2.0SE cabriolet 95k summer toy
'97 306 XS 1.6i 99k sat 12 years, fixed in 7 days, 150mile maiden voyage :rofl2:
User avatar
white exec
Moderating Team
Posts: 7445
Joined: 21 Dec 2015, 12:46
Location: Sayalonga, Malaga, Spain
My Cars: 1996 XM 2.5TD Exclusive hatch RHD
1992 BX19D Millesime hatch LHD
previously 1989 BX19RD, 1998 ZX 1.9D auto, 2001 Xantia 1.8i auto
and lots of Rovers before that: 1935 Ten, 1947 Sixteen, 1960 P5 3-litre, 1966 P6 2000, 1972 P6 2000TC, and 1975 P6B 3500S
x 1752

Re: 406 Hdi fuel consumption

Post by white exec »

Of course....makes sense. Not something I have to worry about these days.
Chris
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: 406 Hdi fuel consumption

Post by Peter.N. »

Yes I have heard about the possibility of it sticking open but haven't checked yet. I have tried reconnecting and again disconnecting the MAF and it definitely seems to give better MPG with it disconnected although it isn't as much as when I first did it , only a mile or two.

I am going to check both MAFs at the weekend and go from there although it definitely feels as though
one on my wife,s car is working, it came off my old silver one which was doing about 60 mpg and although the journey is the same every day at the moment there are variables like traffic and air temperature which I have found makes a lot of difference, my really good mpg figures were all obtained in the summer. I have a photo of the display on the silver one showing 67 mpg over 500 miles coming home from Scotland, but it was a very hot day and I think the computer was erring on the high side.

Peter
Post Reply