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S80 '06> / V70 '07> / XC70 '07> General Forum for the Volvo S80 '06> / V70 '07> XC70 '07> models (V70 Generation 3)

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XC70 D5 poor MPG

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Old Feb 16th, 2020, 14:56   #41
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D5 is just a badge denoting a 5 pot engine
Apparently that is no longer the case. The D denotes a diesel engine but the 5 denotes the power range into which the engine falls. I suspect that at the top end of the power range the only diesel engines are the 5 pots but there are 5 pot diesels with D4 badging. There is a thread on here which delves into this D# badging nonsense.
2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey
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Old Feb 17th, 2020, 23:42   #42
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Originally Posted by V70Zig View Post
D5 is just a badge denoting a 5 pot engine, there are engine variants for the D5 and might not be the same, putting the correct info into Vida should give you the right info.

I too have a bluetooth reader, because I don't have a temp gauge ! I have the torque and the car scanner apps on my phone to see actual temp.
From lotuscorty's posts it looks like his has unfortunately stuck in an open position which will fool the ecu into over fuelling.
Quickest way to to check without any apps or diagnostics connected is to start up from cold (overnight) and feel the top hose from rad to engine as it should remain a lot "cooler than the bottom hose" if it's getting warm after a couple or 3 min it's more than likely stuck open or partially open.

Welcome anybody's views on this post just in case I'm wrong....oh and there is a thanks button if I'm right...............
V70Zig's is the same car as my Dad's, just his has the Polestar upgrade to 205 bhp.

@V70Zig - Thank you for the pictures. It looks simple enough!
2007 Volvo S80 2.4D with 102,000 miles.
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Old Feb 18th, 2020, 12:25   #43
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For these models, there were 5-cylinder diesels with 2.0 and 2.4 liter capacity.
Power ranges from 163 to 230 hp.
Today, there are four cylinder diesels badged with D4 as well as D5. The newest are badged B5 or B4, but that's regardless of whether they are petrol or diesel engines.
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