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Fuel consumption serious issue help please

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Old 03-22-2018, 10:21 PM
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Default Fuel consumption serious issue help please

Hi Guys and gals.
I need some help/advice please. I have a pre-lci e61 525d and my consumption is ridiculous. I get on average 12mpg! I’ve recently changed both stats, the manifold, refurbished the turbo, used the injector cleaner, checked the injectors on ista d and they’re all fine, ran the diagnostics no errors and I have tried disconnecting the maf to run on default values and the consumption was higher.
Can anyone please suggest anything else I can try to increase the consumption to normal level?
Thanks in advance.
Old 03-23-2018, 08:06 AM
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So you're getting around 180miles/280km per fill up?


Just want to make sure it is not your OBC playing up.
Old 03-23-2018, 09:34 AM
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Originally Posted by gIzzE
So you're getting around 180miles/280km per fill up?


Just want to make sure it is not your OBC playing up.
yes something like this around 300 to 350 inside 75 and motorway 25
do you have any idea what should i do
Old 03-25-2018, 05:59 AM
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Are you managing to get a full and complete re-gen, continuous failed re-gen attempts will destroy your MPG
Old 03-27-2018, 05:37 AM
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Originally Posted by Misterbish
Are you managing to get a full and complete re-gen, continuous failed re-gen attempts will destroy your MPG
How many kilometers on the car?

If you can use ISTA to get some additional information it would help.
How long since the last regen (shown in metres) and back pressure values. This will help with determining the state of the DPF.

Also what is the running temperature after the stat change?

Does the car feel sluggish?

You are using at least twice as much diesel as you should - big clouds of smoke when you drive steady?
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