Engine: D5: - 25% drop in fuel consumption after full service

flyfisher1 · Apr 19th, 2015, 09:20

Hi,
Just posting to see if anyone has had this issue or can advise on what the problem might be?
My 2006 XC70 AWD D5 went for a full 112000 mile service recently. Beforehand it was doing 43/44 mpg. Afew days later the swirl flap rod broke - now fixed. I did then reset the trip and now it is only doing 35 mpg. I knew something was wrong straight away because the instant readout was showing less than 30 when in 5th gear on the flat - usually this is well over 40.
Any suggestions? Has the garage damaged something? They did replace the fuel filter - in their word it was very bad - and they did 'flush' the system. Could it be something wrong with the replaced swirl flap rod? Any ideas would be helpful please. Thanks in advance.

Brendan W · Apr 19th, 2015, 09:33

First thing that springs to mind is they over tightened the handbrake or replaced pads without cleaning properly and a brake is dragging.
Second, a flush is new to me. How exactly was that done?
Third, the swirl arm 'fixed' as in epoxy string and wire or replaced ?
Fourth, have they disconnected the MAF sensor and forgotten to reconnect , maybe when replacing the air filter.
Is the car driving right not down on power or pickup ?
What else is on the service invoice?

Clan · Apr 19th, 2015, 09:47

Quote:

Originally Posted by flyfisher1

Hi,
Just posting to see if anyone has had this issue or can advise on what the problem might be?
My 2006 XC70 AWD D5 went for a full 112000 mile service recently. Beforehand it was doing 43/44 mpg. Afew days later the swirl flap rod broke - now fixed. I did then reset the trip and now it is only doing 35 mpg. I knew something was wrong straight away because the instant readout was showing less than 30 when in 5th gear on the flat - usually this is well over 40.
Any suggestions? Has the garage damaged something? They did replace the fuel filter - in their word it was very bad - and they did 'flush' the system. Could it be something wrong with the replaced swirl flap rod? Any ideas would be helpful please. Thanks in advance.

Firstly there is no such thing as a 112000 mile service it is either 126000, 108000 or 90000

Secondly you reset the average fuel consumption meter , when did you last do that ?

Does the handbrake feel "tighter" ?

Is the fuel gauge going down faster than you are used to ?
I would leave it a bit longer and see if things average out ..

Simon Jones · Apr 19th, 2015, 10:03

Shouldn't it read: 25% increase in fuel consumption?

Brendan W · Apr 19th, 2015, 10:06

Quote:

Originally Posted by Simon Jones

Shouldn't it read: 25% increase in fuel consumption?

No, it should read 44 mpg

flyfisher1 · Apr 19th, 2015, 10:29

Thanks for the prompt replies chaps. Yep should have read increase in fuel consumption!
The swirl thing was fixed by the garage using a drill and pinned. The service invoice said these items were done - engine flush, change oil and filter, air filter, fuel filter, cabin filter, all levels checked.
I immediatley checked the brakes- they arent dragging and are all ok.

flyfisher1 · Apr 19th, 2015, 10:35

.. that the car is lumpy when cold but goes ok when hot other than a misfire at about 1800 revs.

flyfisher1 · Apr 19th, 2015, 10:38

.. I reset the ave fuel after the swirl arm had been fitted.
The handbrake is no tighter than before the service
fuel gauge is def going down faster

Joe Harding · Apr 19th, 2015, 13:19

Puddle of fuel on the drive?

4candles · Apr 19th, 2015, 13:27

Quote:

Originally Posted by Brendan W

What else is on the service invoice?

Grubby prints and a heavy pen i'd imagine....

Apr 19th, 2015, 09:20	#1
flyfisher1 New Member Last Online: Nov 1st, 2020 11:59 Join Date: Jun 2012 Location: lichfield	25% drop in fuel consumption after full service Hi, Just posting to see if anyone has had this issue or can advise on what the problem might be? My 2006 XC70 AWD D5 went for a full 112000 mile service recently. Beforehand it was doing 43/44 mpg. Afew days later the swirl flap rod broke - now fixed. I did then reset the trip and now it is only doing 35 mpg. I knew something was wrong straight away because the instant readout was showing less than 30 when in 5th gear on the flat - usually this is well over 40. Any suggestions? Has the garage damaged something? They did replace the fuel filter - in their word it was very bad - and they did 'flush' the system. Could it be something wrong with the replaced swirl flap rod? Any ideas would be helpful please. Thanks in advance.

Apr 19th, 2015, 10:29	#6
flyfisher1 New Member Last Online: Nov 1st, 2020 11:59 Join Date: Jun 2012 Location: lichfield	Fast replies Thanks for the prompt replies chaps. Yep should have read increase in fuel consumption! The swirl thing was fixed by the garage using a drill and pinned. The service invoice said these items were done - engine flush, change oil and filter, air filter, fuel filter, cabin filter, all levels checked. I immediatley checked the brakes- they arent dragging and are all ok.

Apr 19th, 2015, 10:35	#7
flyfisher1 New Member Last Online: Nov 1st, 2020 11:59 Join Date: Jun 2012 Location: lichfield	forgot to say .. that the car is lumpy when cold but goes ok when hot other than a misfire at about 1800 revs.

Apr 19th, 2015, 10:38	#8
flyfisher1 New Member Last Online: Nov 1st, 2020 11:59 Join Date: Jun 2012 Location: lichfield	more .. I reset the ave fuel after the swirl arm had been fitted. The handbrake is no tighter than before the service fuel gauge is def going down faster

Apr 19th, 2015, 13:19	#9
Joe Harding Premier Member Last Online: Today 14:27 Join Date: Oct 2010 Location: Bristol	Puddle of fuel on the drive? __________________ "The more people I meet the more I like my God."

Apr 19th, 2015, 09:33	#2
Brendan W Premier Member Last Online: Apr 2nd, 2024 19:50 Join Date: Dec 2007 Location: Wexford	First thing that springs to mind is they over tightened the handbrake or replaced pads without cleaning properly and a brake is dragging. Second, a flush is new to me. How exactly was that done? Third, the swirl arm 'fixed' as in epoxy string and wire or replaced ? Fourth, have they disconnected the MAF sensor and forgotten to reconnect , maybe when replacing the air filter. Is the car driving right not down on power or pickup ? What else is on the service invoice?

Apr 19th, 2015, 10:03	#4
Simon Jones Premier Member Last Online: Jan 15th, 2022 11:23 Join Date: Feb 2009 Location: Salisbury (ish)	Shouldn't it read: 25% increase in fuel consumption?

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