Engine: D5: - 25% drop in fuel consumption after full service - Page 2

oragex · Apr 19th, 2015, 13:35

I don't have an answer but I won't let my car being serviced by a garage that does an engine flush when changine the oil. This alone tells me it's a so-so mechanic. He did touch to the fuel system so I would start looking at that

4candles · Apr 19th, 2015, 13:42

Is the swirl flap free to rotate?

Dancake · Apr 19th, 2015, 13:47

Maybe they've used a heavier grade of oil such as a 10W- instead of a 0W- something.

D5meister · Apr 19th, 2015, 15:21

go thru your fuel recipts to eliminate any "It was definaltely better than that"

see if your spending the same on fuel per unit time

then the view loses weight

RM955I · Apr 19th, 2015, 18:01

You can only really get accurate MPG by doing the maths, not relying on an on board computer.

xco · Apr 20th, 2015, 03:49

Both my previous S60 D5 and my V70 D5 used to use more fuel after a service but would settle back down to their normal 55ish mpg after a couple of weeks.
I agree with clan, run it a few weeks until the oil has broken in a bit and your filters have had use and see if your fuel gauge reads different then.

Ps Check the right oil went in .... Is 0w30 fully synthetic, castrol volvo recommended best and edge a close second.
Dont forget your engine is aluminium its important to have the right oil.

Symes · Apr 20th, 2015, 05:35

It might be that you've just unfortunately hit a dpf regen straight after the service, have you done a long enough journey at the correct revs to rule it out?

scsxc90 · May 22nd, 2022, 11:39

Hi Flyfischer1 and more ..

I just made a big service (20k + 40k service) on my 2014 XC90 D5 (D5244T18) and did a fuel filter change, engine/filter change, engine air filter change and gearbox flush. I then had the turbo blowing off the Turbo Outlet Noise filter just a few days after with both rubber gaskits blown in half
(At the service the lower gasket looked fine .. the top is nearly impossible to get a good look at .. tried as good as possible with a flashlight and a mirror and twisting like to "the book of records)
ending up limping home from town. I got new rubber rings and got it all cleaned up and mounted .. got the fault code reading reset
(the o2 sensor had a reading outside it's parameter settings because of lost turbo preasure and showed up twice on DTC, once for faulty power once for faulty mass connection)

BUT
my instant fuel comsumptiom display also went haywire .. but only at redusing speed and starting from 0 ... it can go from 43 all up to 99,9 L/100 KM and stay there at slow and crawling speed, but slowly coming down on the normal 5,5 - 6 L/100 KM by crusing speed of about 95 km/h.
I have never seen that before in line of work and found only 1 entry on the US counterpart of this forum.
It seems to be speed related .. either wheel rotation or air speed in the MAF or fuel flow ...
The system is build like if the DIM can't get the real-time info, it is making the calculations on an estimated set of values which can be very far off from real if having big differential values.

Apr 19th, 2015, 13:35	#11
oragex Premier Member Last Online: Jul 26th, 2021 21:24 Join Date: Jun 2013 Location: Coldnada	I don't have an answer but I won't let my car being serviced by a garage that does an engine flush when changine the oil. This alone tells me it's a so-so mechanic. He did touch to the fuel system so I would start looking at that __________________ Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c

Apr 19th, 2015, 13:47	#13
Dancake Premier Member Last Online: Today 20:10 Join Date: Apr 2011 Location: Belfast	Maybe they've used a heavier grade of oil such as a 10W- instead of a 0W- something. __________________ 1996 850 T5 - Sold 2003 S40 1.9d - Sold 2004 S60 D5

Apr 19th, 2015, 18:01	#15
RM955I Premier Member Last Online: Jun 26th, 2022 23:42 Join Date: Mar 2012 Location: Midlands	You can only really get accurate MPG by doing the maths, not relying on an on board computer. __________________ D5, 205 Phase 3 V70...love the grunt. Previous: 2004 (2005 facelift) 2.4 170

Apr 20th, 2015, 03:49	#16
xco Premier Member Last Online: Today 04:32 Join Date: Apr 2009 Location: Near Plymouth	Both my previous S60 D5 and my V70 D5 used to use more fuel after a service but would settle back down to their normal 55ish mpg after a couple of weeks. I agree with clan, run it a few weeks until the oil has broken in a bit and your filters have had use and see if your fuel gauge reads different then. Ps Check the right oil went in .... Is 0w30 fully synthetic, castrol volvo recommended best and edge a close second. Dont forget your engine is aluminium its important to have the right oil. __________________ MY14 XF S V6 3.0 Sportbrake Portfolio in Ultimate Black Metallic and black 20"alloys MY08 Xc90 D5 185 Se Lux Satnav Geartronic. Much loved gone now but not forgotten. Wherever you go............There you are!!! Last edited by xco; Apr 20th, 2015 at 03:52.

Apr 20th, 2015, 05:35	#17
Symes Master Member Last Online: Apr 10th, 2024 03:33 Join Date: Oct 2001 Location: Andover, Hants	It might be that you've just unfortunately hit a dpf regen straight after the service, have you done a long enough journey at the correct revs to rule it out? __________________ Previously held: 264GLE;S60 SE 2.0T;XC70 SE LUX D5 (163);V70 SE (170);V70 SE D5 (163) Currently held: XC90 SE LUX (MY12 200), XC70 SE D5 (MY06 185); V70 SE D5 (MY07 185)

Apr 19th, 2015, 13:42	#12
4candles I've Been Banned Last Online: Mar 19th, 2016 19:57 Join Date: Oct 2013 Location: Yondershire	Is the swirl flap free to rotate?

Apr 19th, 2015, 15:21	#14
D5meister Premier Member Last Online: Feb 10th, 2024 19:13 Join Date: Nov 2008 Location: Huntingdon	go thru your fuel recipts to eliminate any "It was definaltely better than that" see if your spending the same on fuel per unit time then the view loses weight

May 22nd, 2022, 11:39	#18
scsxc90 Volvo Mechanic a. D. Last Online: Feb 4th, 2024 15:41 Join Date: May 2022 Location: Soenderborg	Faulty reading on the instant fuel consumption display Hi Flyfischer1 and more .. I just made a big service (20k + 40k service) on my 2014 XC90 D5 (D5244T18) and did a fuel filter change, engine/filter change, engine air filter change and gearbox flush. I then had the turbo blowing off the Turbo Outlet Noise filter just a few days after with both rubber gaskits blown in half (At the service the lower gasket looked fine .. the top is nearly impossible to get a good look at .. tried as good as possible with a flashlight and a mirror and twisting like to "the book of records) ending up limping home from town. I got new rubber rings and got it all cleaned up and mounted .. got the fault code reading reset (the o2 sensor had a reading outside it's parameter settings because of lost turbo preasure and showed up twice on DTC, once for faulty power once for faulty mass connection) BUT my instant fuel comsumptiom display also went haywire .. but only at redusing speed and starting from 0 ... it can go from 43 all up to 99,9 L/100 KM and stay there at slow and crawling speed, but slowly coming down on the normal 5,5 - 6 L/100 KM by crusing speed of about 95 km/h. I have never seen that before in line of work and found only 1 entry on the US counterpart of this forum. It seems to be speed related .. either wheel rotation or air speed in the MAF or fuel flow ... The system is build like if the DIM can't get the real-time info, it is making the calculations on an estimated set of values which can be very far off from real if having big differential values.

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