Diesel low MPG

..... · 15th November 2011, 03:55

Hi,
I'm looking for some help here.
I have recently brought a 2004 75 manual CDT Tourer but the MPG is not great. On a long run I'm getting 43 mpg and round town that drops to 36 and that's driving carefully. The car has a genuine 75,000 miles on it. It pulls like a train and is smooth as you like.
I had a diesel 75 tourer about 5 years ago and always got round the 50 mpg from that.

The engine temp only gets to just the bottom of the temp symbol on the temp gauge unless I'm sitting in traffic for 10 mins or so when it will reach the 9 o'clock mark so I will be fitting the thermostat mod this weekend.. how much difference does a cool running engine make to mpg?

What should I check that can improve my mpg?

Thanks in advance for your help.

kissifer1972 · 15th November 2011, 07:56

You need to have a look around on here there is a cheap fix for a failed thermostat using a Renault in pipe thermostat, about £10 IIRC

Quick to fit too as you just slide it into the radiator hose.

Then see if this improves your MPG

Chris

wuzerk · 15th November 2011, 08:02

My maximum temp via the on board diagnostics was 74C, after the mod the consumption improved by about 3 mpg. Other owners have reported greater improvements. Even if you dial reaches the quarter too it merely means that your temp is somewhere between 75-100C so it looks as though you are certainly running too cool. You should clean the EGR assembly out too
as it is almost certainly clogged with gunk. Afterwards plug the end of the thin flexible pipe so that the valve does not work in the future and the EGR will stay clean. Wear gloves!

radi8or · 15th November 2011, 08:19

This may also help.

..... · 15th November 2011, 14:42

Quote:

Originally Posted by radi8or

This may also help.

Strange enough I was reading this thread this morning.

..... · 15th November 2011, 14:45

Quote:

Originally Posted by wuzerk

You should clean the EGR assembly out too
as it is almost certainly clogged with gunk. Afterwards plug the end of the thin flexible pipe so that the valve does not work in the future and the EGR will stay clean. Wear gloves!

Is there a how to do this somewhere?
cheers

radi8or · 15th November 2011, 15:37

Couldn't find a specific cleaning how to but this may help.

Singvogel · 15th November 2011, 15:48

Check out landyzone.co.uk.

The Freelander section forum has lots of threads on 'how to' things, esp the EGR and the PCV.

TD4 BMW M47R - same engine - same problems - same fix.

HarryM1BYT · 15th November 2011, 16:16

Quote:

Originally Posted by Flintstone

Is there a how to do this somewhere?
cheers

Just type into the forum search 'EGR' and 'EGR clean' or 'EGR bypass' .

..... · 15th November 2011, 16:30

Quote:

Originally Posted by HarryM1BYT

Just type into the forum search 'EGR' and 'EGR clean' or 'EGR bypass' .

Had a look through and have decided to do the EGR bypass mod.. one now ordered.

15th November 2011, 03:55	#1
..... Loves to post Black ROVER 75 Join Date: Nov 2011 Location: Somewhere Posts: 339 Thanks: 5 Thanked 17 Times in 7 Posts	Diesel low MPG Hi, I'm looking for some help here. I have recently brought a 2004 75 manual CDT Tourer but the MPG is not great. On a long run I'm getting 43 mpg and round town that drops to 36 and that's driving carefully. The car has a genuine 75,000 miles on it. It pulls like a train and is smooth as you like. I had a diesel 75 tourer about 5 years ago and always got round the 50 mpg from that. The engine temp only gets to just the bottom of the temp symbol on the temp gauge unless I'm sitting in traffic for 10 mins or so when it will reach the 9 o'clock mark so I will be fitting the thermostat mod this weekend.. how much difference does a cool running engine make to mpg? What should I check that can improve my mpg? Thanks in advance for your help.

15th November 2011, 07:56	#2
kissifer1972 Posted a thing or two Rover 75 CDTi Conn Tourer & Rover 75 CDT Conn SE Saloon Join Date: May 2010 Location: Queensbury Posts: 1,368 Thanks: 0 Thanked 1 Time in 1 Post	You need to have a look around on here there is a cheap fix for a failed thermostat using a Renault in pipe thermostat, about £10 IIRC Quick to fit too as you just slide it into the radiator hose. Then see if this improves your MPG Chris __________________ Mods so far X-Power Performance Upgrade LED interior lights and sidelights Genuine Rover Xenons - now removed and sold Kenlowe fan Synergy 2 EGR Bypass

15th November 2011, 08:02	#3
wuzerk Passed Away Rover 75 CDT 03 auto Conn. SE Join Date: May 2009 Location: London Posts: 2,885 Thanks: 104 Thanked 254 Times in 204 Posts	Temp My maximum temp via the on board diagnostics was 74C, after the mod the consumption improved by about 3 mpg. Other owners have reported greater improvements. Even if you dial reaches the quarter too it merely means that your temp is somewhere between 75-100C so it looks as though you are certainly running too cool. You should clean the EGR assembly out too as it is almost certainly clogged with gunk. Afterwards plug the end of the thin flexible pipe so that the valve does not work in the future and the EGR will stay clean. Wear gloves!

15th November 2011, 08:19	#4
radi8or Gets stuck in Rover 75 Saloon Join Date: Nov 2006 Location: Dagenham Posts: 760 Thanks: 11 Thanked 11 Times in 10 Posts	This may also help. __________________ Regards. Bob Member # 45

15th November 2011, 15:37	#7
radi8or Gets stuck in Rover 75 Saloon Join Date: Nov 2006 Location: Dagenham Posts: 760 Thanks: 11 Thanked 11 Times in 10 Posts	Couldn't find a specific cleaning how to but this may help. __________________ Regards. Bob Member # 45

15th November 2011, 15:48	#8
Singvogel Gets stuck in 75 CDT, 1966 2000TC P6, TD4-M47 Join Date: Oct 2011 Location: Deepest darkest Aberdeenshire Posts: 626 Thanks: 0 Thanked 3 Times in 3 Posts	Check out landyzone.co.uk. The Freelander section forum has lots of threads on 'how to' things, esp the EGR and the PCV. TD4 BMW M47R - same engine - same problems - same fix.