C5 2.2HDi poor economy

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cachaciero
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Joined: 13 Apr 2009, 07:24
Location: West Sussex U.K
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Post by cachaciero »

O.K given that I am now digging into 4HP20 performance on 2.2's and have more questions than answers did the OP ever get a resolution to this?
2006 Toyota Prius T Spirit
2001 2.2 C5 Exclusive SE
1996 XM 2.1 TD Auto VSX
1995 XM 2.1 TD Auto SX died @ 140K
1987 CX 2.5 Gti Turbo II dead
1984 Ford Scorpio
1981 CX 2.4 Pallas Auto
Renault 21
1220 GS Club
Rover P6 2000TC
jimleshed
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Joined: 29 Apr 2010, 19:19
Location: somerset, uk
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Post by jimleshed »

My 2.2HDI Exclusive SE has been low MPG since I bought it and nothing I tried seemed to change it.
Most of the time I am just back and forward to work in it, about 5 miles fast roads with 2 miles town traffic. Average when bought was about 31- 32MPG. This is real calculated MPG, not relying on computer which can be wrong.

Eolys filled and working - no change
New DPF in exhaust - no change but top end speed improved.
New Air filter - no change
Italian tune up (when I ripped off the undertray on the M5) - now up to 34.1MPG - ok, this may be down to having all the undertray now fitted properly and not waving about as I drive.
Next step is to try some injector cleaner and see if that does anything. But i am pleased that eventually it seems to have got a bit better!


Note - Italian tune up = blast down Mway at top speed.
Legal advisory note, dont break the speed limit.... :lol:
Jim Le Shed
...
Citroen C5 2.2 HDI Exclusive
Mazda RX8 231PS
Past history...
Mazda MX5
Renault Lagunas (3)
Peugeot 405, 205
Citroen CX's (5)
Citroen GS (lots of other Cars and Bikes too!!)
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Old-Guy
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Joined: 11 Sep 2008, 12:08
Location: Gloucestershire
My Cars: 2011 Grand C4 Picasso VTR+ 1.6HDi in Kyanos Blue
1995 Xantia Estate SX 1.9TD in Vert Vega "The Green Lady" - now owned by XanTom
1998 Xantia 2.1 VXD Estate in Mauritius Blue - R.I.P. (terminal tin-worm)
x 17

Post by Old-Guy »

I wonder if Jim Le Shed has put his finger on the cause of your problem - it led a sheltered life when new so the engine has never bedded in and 7 years of gentle motoring (and cheap supermarket diesel) has coked up the engine.

If it uses some oil when driven hard, that would tend to confirm.

Fill it with Shell or BP premium diesel and give it some welly.
2011 Grand C4 Picasso VTR+ 1.6HDi in Kyanos Blue
1995 Xantia Estate SX 1.9TD in Vert Vega "The Green Lady" - after 11 years now owned by XanTom
1998 Xantia 2.1 VXD Estate in Mauritius Blue - R.I.P. (terminal tin-worm)
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