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XC70 D5 poor MPG

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Old Feb 7th, 2020, 12:56   #11
Tatsfield
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As these cars age the message is that serious owners need to own their own VIDA/DiCE to quickly identify the causes of performance deterioration. Even if you had to buy a second hand laptop to run the program, the outlay is not likely to be much more that £100 for everything including a car charger so you do not have to worry about the battery state of the laptop.
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Old Feb 7th, 2020, 22:32   #12
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The car has been on VIDA and there are no codes to suggest anything is wrong, the only historic one when an intercooler pipe was split. I will have to do some running and check temps etc. But ai don't know what temp is the normal running temp? I would assume about 90 like most cars??
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Old Feb 8th, 2020, 12:55   #13
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Don't think my engine has the swirl flaps?? Going to run it today with diagnostics connected and see what temp it's sitting at. Anyone know what it should be?? Thanks.
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Old Feb 8th, 2020, 14:07   #14
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Quote:
Originally Posted by lotuscorty View Post
The car has been on VIDA and there are no codes to suggest anything is wrong, the only historic one when an intercooler pipe was split. I will have to do some running and check temps etc. But ai don't know what temp is the normal running temp? I would assume about 90 like most cars??
90 sounds about right. Funnily enough I stuck my EM327 in this morning and connected via Torque app on my phone.
I didn't do a long run as such, but the temp rose to nigh on 90 then dropped slightly and rose again before dropping again and continued this throughout. Stop starts, pick up the paper,Tesco and a visit to my sister some 8 miles away.

Hopes this helps.

What you need to know is how long does it take to reach that operating temp.
I'm off work this week and come Tuesday will be going away for a couple of days......I'll post at what mileage I reach the operating temp and the time it took, speed, etc. as it all factors in....so does the outside temp.......
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Old Feb 8th, 2020, 17:19   #15
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Don't think my engine has the swirl flaps?? Going to run it today with diagnostics connected and see what temp it's sitting at. Anyone know what it should be?? Thanks.
Euro 4 engines onwards have them as far as I know, so yours should too.
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Old Feb 8th, 2020, 20:11   #16
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V70Zig Thanks for the info. If you could let me know how long it takes to reach operating temp that would be really helpful.
I ran it today but only for a few miles and it was nowhere near 90. I'll check it on a longer run. Thanks.

Kev0607 I'm not sure my engine has? On the older engine I am aware of where the flap lever is, however nothing on mine. The engine is a D5244t10
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Old Feb 9th, 2020, 09:06   #17
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Quote:
Originally Posted by lotuscorty View Post
The engine is a D5244t10
No swirl flaps on this engine
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Old Feb 9th, 2020, 10:49   #18
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Quote:
Originally Posted by lotuscorty View Post
V70Zig Thanks for the info. If you could let me know how long it takes to reach operating temp that would be really helpful.
I ran it today but only for a few miles and it was nowhere near 90. I'll check it on a longer run. Thanks.

Kev0607 I'm not sure my engine has? On the older engine I am aware of where the flap lever is, however nothing on mine. The engine is a D5244t10
My cold start this morning -
Outside temp 11, coolant temp 11 before startup.
First 2.5 miles to get out of town 30 mph max. Then onto dual carriageway 60 mph.
Having covered 5.5 miles in 9 minutes the coolant reached 91 before dropping back to 87 - 88 - 89, 88 - 89 consistently for a further 6 miles.

My average consumption at opening was 27.9 according to the dash. Finally it's pretty flat round here.

Nothing in Vida re a swirl flap motor for yours.....there is for mine. So Olaf is probably right.
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Old Feb 10th, 2020, 14:03   #19
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And today - same destination, but missed out the dual carriageway and went through the villages so a lot of speed bumps and 30 mph speed limit.

Outside temp 3, coolant temp 5.

So it took 6.6 miles and 17 minutes to reach temp, then acted as yesterday.

Just shows you that outside temp and speed come into play.

Hope this helps.
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Old Feb 11th, 2020, 12:10   #20
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Ok, so did a short run today. Outside temp 6 car was 22 as had been run previously. Did about a 15 min run, short bit of town and then dual carriageway for about 8 miles and couple of miles of town again. Highest reading I got was 67, so comparing that, it would seem that the thermostat seems to be stuck open, so I guess that will be the next job to replace that!!
Thanks for all the help.
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