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.

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.

What's a TB ?

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.

Throttle Body I'd guess.

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.

Throtle body.

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

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.

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!