Horrible MPG, V50 2.0D MW 2009

Ghost83 · Oct 28th, 2018, 06:06

Hey guys,

I’ve noticed that my MPG is horrible! Like around 20MGP!
I’ll need to get to the bottom of it, but never owned a diesel car before!
Where to start? What to check?

The TB is clean! This is all I’ve done! But it was filthy with soot, oil residue which I am not sure if typical to a Diesel engine. But it can be a starting point...
EGR will get done next week and I’ll report back on that.

At the moment I am not sure if I have a DPF or not! I have a single inlet air intake manifold! The engine looks and feels all right. No shakes, vibrations, goes like a rocket. No leaks, spillages under the engine! No hissing, vacuum lines seem to be in good nick.
No smoke coming from the muffler even when it’s cold.
I mainly use the car downtown, so very little freeway ride. But I still think the MPG I am getting is unacceptable.

It’s a 2.0D 2009 MW 100kw.

DSK · Oct 28th, 2018, 07:55

Try a long freeway run where you can keep the revs up at around 3,000rpm in a lower gear for about 15-20 minutes. Diesel's tend get cruddy just doing short trips and urban duties.

In the new diesel cars I had, despite doing 900 miles a week on mainly motorways, at the speed limits, the cars were revving quite low as you'd expect at around 1,800-2,200rpm. Every couple of months I'd start to notice a drop in MPG. A local garage advised me to run the engine at higher rpm on a long run by keeping it in a lower gear for 15-20 minutes - this did the trick. Guess it helps to clean/burn crap out.

BOBAD · Oct 29th, 2018, 14:29

Quote:

Originally Posted by Tigrincs

The TB is clean!

What's a TB ?

Yobbo · Oct 29th, 2018, 16:50

Quote:

Originally Posted by Tigrincs

Hey guys,

I’ve noticed that my MPG is horrible! Like around 20MGP!
I’ll need to get to the bottom of it, but never owned a diesel car before!
Where to start? What to check?

The TB is clean! This is all I’ve done! But it was filthy with soot, oil residue which I am not sure if typical to a Diesel engine. But it can be a starting point...
EGR will get done next week and I’ll report back on that.

At the moment I am not sure if I have a DPF or not! I have a single inlet air intake manifold! The engine looks and feels all right. No shakes, vibrations, goes like a rocket. No leaks, spillages under the engine! No hissing, vacuum lines seem to be in good nick.
No smoke coming from the muffler even when it’s cold.
I mainly use the car downtown, so very little freeway ride. But I still think the MPG I am getting is unacceptable.

It’s a 2.0D 2009 MW 100kw.

20 MPG is awful - is this what you're getting on average MPG readout?

I'd be looking for split boost hoses, also try running on BP Ultiamte or another premium diesel alternative.

iainmd · Oct 29th, 2018, 21:23

Quote:

Originally Posted by BOBAD

What's a TB ?

Throttle Body I'd guess.

iainmd · Oct 29th, 2018, 21:25

I doubt using premium fuel will yield and results. Step one is probably a scam with Vida for any apparent faults.

A 2.0D should never average that low.

Ghost83 · Oct 30th, 2018, 11:21

Quote:

Originally Posted by BOBAD

What's a TB ?

Throtle body.

Ghost83 · Oct 30th, 2018, 11:23

Quote:

Originally Posted by Yobbo

20 MPG is awful - is this what you're getting on average MPG readout?

I'd be looking for split boost hoses, also try running on BP Ultiamte or another premium diesel alternative.

I use Shell only. But will try your suggestion.
I don’t have a trip computer so I just did my own calculation.

Could you advise on Throttle Body, pls? Should it be a single inlet or a dual?
It’s an euro 5 engine, 2009!

Thanks

Ghost83 · Oct 30th, 2018, 11:25

Quote:

Originally Posted by iainmd

I doubt using premium fuel will yield and results. Step one is probably a scam with Vida for any apparent faults.

A 2.0D should never average that low.

In all fairness I did a bit of freeway this weekend. Just about 20 miles, and pretty much can’t see anything as to how much fuel I used. The needle stayed in one place. So keeping the faith.

Ghost83 · Oct 30th, 2018, 11:30

Quote:

Originally Posted by iainmd

I doubt using premium fuel will yield and results. Step one is probably a scam with Vida for any apparent faults.

A 2.0D should never average that low.

I’ve got nothing in VIDA!
I had a sh***y battery 🔋 but swapped it. Only code I had is low battery signal. So nothing I can go on about, am afraid!

Oct 28th, 2018, 06:06	#1
Ghost83 V50 2.0D 2009 R-Design Last Online: Jun 16th, 2021 06:54 Join Date: May 2014 Location: London	Horrible MPG, V50 2.0D MW 2009 Hey guys, I’ve noticed that my MPG is horrible! Like around 20MGP! I’ll need to get to the bottom of it, but never owned a diesel car before! Where to start? What to check? The TB is clean! This is all I’ve done! But it was filthy with soot, oil residue which I am not sure if typical to a Diesel engine. But it can be a starting point... EGR will get done next week and I’ll report back on that. At the moment I am not sure if I have a DPF or not! I have a single inlet air intake manifold! The engine looks and feels all right. No shakes, vibrations, goes like a rocket. No leaks, spillages under the engine! No hissing, vacuum lines seem to be in good nick. No smoke coming from the muffler even when it’s cold. I mainly use the car downtown, so very little freeway ride. But I still think the MPG I am getting is unacceptable. It’s a 2.0D 2009 MW 100kw. __________________ Greg, proud owner of a V50 '09 2.0D R-Design Progress thread: https://www.volvoforums.org.uk/showthread.php?t=286968 XC90- sold \| XC70-sold \| C30- sold \| V70- sold

Oct 28th, 2018, 07:55	#2
DSK C70 T5 Last Online: Mar 23rd, 2022 21:00 Join Date: Sep 2006 Location: Midlands	Try a long freeway run where you can keep the revs up at around 3,000rpm in a lower gear for about 15-20 minutes. Diesel's tend get cruddy just doing short trips and urban duties. In the new diesel cars I had, despite doing 900 miles a week on mainly motorways, at the speed limits, the cars were revving quite low as you'd expect at around 1,800-2,200rpm. Every couple of months I'd start to notice a drop in MPG. A local garage advised me to run the engine at higher rpm on a long run by keeping it in a lower gear for 15-20 minutes - this did the trick. Guess it helps to clean/burn crap out. __________________ 2000 C70 T5 GT Coupe 1998 S70R / 1995 Toyota Supra Twin Turbo 2007 Mercedes CLS 320 CDI / 2011 Mercedes S350 Bluetec 2007 Suzuki GSXR-1000

Oct 29th, 2018, 21:25	#6
iainmd Member Last Online: Apr 25th, 2024 13:38 Join Date: Nov 2004 Location: Fife View Photos By: iainmd	I doubt using premium fuel will yield and results. Step one is probably a scam with Vida for any apparent faults. A 2.0D should never average that low. __________________ Present: 2009 Volvo V50 1.6D DRIVe SE Past: 2004 Volvo S40 T5 SE

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