Mondeo Mk4 TCDI 2.0 140 (63 reg) - Low MPG

decmatt

decmatt

decmatt

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Hi all

Have a Mondeo mk4 TCDI 2.0 140 63reg.

Had it around 7 months, when I first got it I was getting an average of 55mpg, but now it is as low as 43mpg.

I have tested this over Motorway and A roads, Motorway was 38MPG and A Roads is 45MPG...

Is there anything I need to check or do, it only has 28k on the clock, but can't afford to run it at an average of 43MPG for a diesel as I'm doing around 20k miles a year.

Thanks for your help
 
Could be down to the DPF needing a clean.

If it is all sooted up, I am pretty sure it can negatively impact fuel economy considerably. Any performance reduction that you've noticed?

Also, is this info from the fuel computer, or your own calculations?
 
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Acme said:
Could be down to the DPF needing a clean.

If it is all sooted up, I am pretty sure it can negatively impact fuel economy considerably. Any performance reduction that you've noticed?
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Nothing to major, only thoughts I've had is found it might be struggling a bit more in third then usual
 
Well third is, I assume, quite a long gear - so I expect that would be where you would notice it most if there were any performance hit.

I can't really offer any further insight as I don't know much about the Mk4 Mondeo, but I know a little a bout DPF's. Stupid things that they are. :p

Quite a lot of people have them on here though, so I'm sure someone will be along shortly.
 
I've read a few other forums and they've said an ECU upgrade (not sure if there will be one, and what the cost would be, or if this can be done under warranty), or EGR clean... Either sound plausible?
 
Well a re-map could improve economy, but that doesn't explain why your fuel economy has gone down.

EGR clean sounds plausible. Dad used to have a MK3 2.0 TDCI which needed the EGR cleaning out, and I think it had a new EGR valve before he got rid of it too.
 
At 28k it won't be a sooted up EGR and a remap is a modification not a repair. If you're doing long journeys the DPF would have regenerated, this would only be an issue if it was a lot of short journeys. If the regen failed it would have probably come up with an error. Have you checked the oil level? It being *above* maximum could indicate a DPF issue.

If it's a 63 reg its in warranty surely anyway so I'd just get it straight back to ford and let them sort it out. I had a similar issue on a mk3 a few years ago and it turned out to be a blocked air filter! Spent more on diagnostics to tell me the turbo was knackered or the injectors had failed than the 5 quid filter it cost to sort it!
 
I'm not clear from your first post, but are you saying that when you first got the car it's average was 55mpg but you've never seen that yourself, or that the fuel economy has gotten worse during your ownership, but your driving style hasn't changed?
 
Havana_UK said:
I'm not clear from your first post, but are you saying that when you first got the car it's average was 55mpg but you've never seen that yourself, or that the fuel economy has gotten worse during your ownership, but your driving style hasn't changed?
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The later, when I bought it, it seemed okay but just seems to have got worse... I have had it serviced a few months ago but that didn't change anything.

Just has got to the point I did 300 miles on the M1 and averaged 38mpg. Had it on cruise control at 70mph, which I thought would/should get much better mpg then that.

Air con wasn't on, and had one other passenger with next to no luggage.
 
I would check the basics first check the tyre pressures, the wheel alignment checked/adjusted when doing this they should be able to get the car in the air and spin the wheels to check for any binding with the brakes.

Also worth checking the tyres aren't directional and spinning the wrong way etc. if they have been replaced/moved since you have had the car.
 
decmatt said:
I did 300 miles on the M1 and averaged 38mpg. Had it on cruise control at 70mph,
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I've the same car but a bit older and did a 225 mile trip at 70mph on Cruise and it came back as a measured 64mpg (fill to spill before and after). At one point the trip computer said I'd nearly got a 1200 mile range :D

mondeo01.jpg
 
I rented a 13 plate 2.0 TDCI 140 Titanium X last year for a trip to Scotland and back and it averaged under 50mpg for the entire trip and it was too slow to waste time driving fast. I was quite disappointed with it.
 
Has the car spent a lot of time doing in town work?
Used to find that my old Volvo D5 had gradually worsening MPG when used primarily in town, then if you gave it a really decent long run (e.g. 200 miles+) the MPG would jump up again. I assumed it was just getting clogged up, and that didn't even have a DPF.
 
It seems odd that you're getting significantly (relatively) lower mpg on the motorway than on A roads... Unless you drive at a very sedate speed. Even old petrol engines will often get 40mpg on the motorway at a steady and legal speed.

I don't mean to sound rude but these two points stand out as being odd to me.
 
Mr_Sukebe said:
Has the car spent a lot of time doing in town work?
Used to find that my old Volvo D5 had gradually worsening MPG when used primarily in town, then if you gave it a really decent long run (e.g. 200 miles+) the MPG would jump up again. I assumed it was just getting clogged up, and that didn't even have a DPF.
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Town driving is pretty bad to be honest, only have to do it about once a month though so I haven't had a fair experience.
 
ianh said:
I've the same car but a bit older and did a 225 mile trip at 70mph on Cruise and it came back as a measured 64mpg (fill to spill before and after). At one point the trip computer said I'd nearly got a 1200 mile range :D

http://www.ianhenshall.com/mondeo01.jpg[/QUOTE]

Very impressive. You get 3x more miles from your tank then me :D
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