E53 3.0d POOR FUEL CONSUMPTION

wilkoturbo · Post by **wilkoturbo** » Sun Mar 06, 2011 10:36 am

Hey thanks for the fast reply what about all the bits going down the hole when drilling it out plus will it run with only five new ones fitted the hole is sealed ??

Nige · Post by **Nige** » Thu Mar 29, 2012 7:28 am

Bit of a thread resurrection.

My X5 has averaged between 23 and 27 for the last 2 years as its mostly local driving or towing. Without trailer, I get mid 30`s on a good run.

I`ve noticed recently, thats dropped to around 20, even on a 180 mile Motorway drive, it only averaged 28 ! Usually I`m into the mid 30`s on a run like that.

This could have been a steady increase in consumption, but I`ve only noticed it the last month or so. New tyres were fitted in December and a run to Germany and back showed almost identical consumption compared to the previous tyres, so I don`t believe thats an issue.

Car drives fine, no new noises or changes in feel, just an increase in fuel consumption.

I towed my trailer / track car to Rockingham and back the other week, that showed 19mpg over that journey, minimal delays and no stopping in traffic, where it usually averages 25 > 27mpg (I drive at 55 to 60 when towing, so get good economy).

Any thoughts ?

X5Sport · Post by **X5Sport** » Thu Mar 29, 2012 9:51 am

Done all the usual checks? Filters, vacuum lines all on and no leaks? Could be the MAF needs replacing. What's the mileage total? Any obvious change in acceleration etc?

ChrisLux · Post by **ChrisLux** » Thu Mar 29, 2012 11:21 am

Could be the DPF , that'll make a big difference if it's clogged up .

Chris

X5Sport · Post by **X5Sport** » Thu Mar 29, 2012 12:03 pm

What DPF? If it's an E53 then they aren't fitted with one as standard. You can opt to have one fitted later, but from the factory the UK spec 3.0d only had a catalytic converter. There was a retrofit kit offered and Owners were given the choice of adding one in the event of an exhaust failing.

The current models have DPF's in order to meet Euro IV and V. The E53 was a Euro III vehicle, one of the reasons why the exhaust tips point at the road.

But it could be a blocked CAT or sensor issue, so you may be going down the right route...

ChrisLux · Post by **ChrisLux** » Thu Mar 29, 2012 12:33 pm

Was under the assumption that mine was fitted with one from what they said at my last full inspection .
But mine is a Europeene model , not UK model , and there were some differences .

dirtymonkey29 · Post by **dirtymonkey29** » Thu Mar 29, 2012 12:58 pm

So it's been around 3 weeks... Did you get the snapped plug out? And has your mpg improved?

Sanj · Post by **Sanj** » Thu Mar 29, 2012 2:49 pm

[quote=""X5Sport""]one of the reasons why the exhaust tips point at the road.:[/quote]

Star for listening in class!

X5Sport · Post by **X5Sport** » Thu Mar 29, 2012 2:51 pm

Yes Master......

And 'Glasshopper' does not mean making one's way from one end of the bar to the other...

Sanj · Post by **Sanj** » Thu Mar 29, 2012 2:53 pm

Now go help the newbie with the X6 - think you'll revel in that one...

X5Sport · Post by **X5Sport** » Thu Mar 29, 2012 2:55 pm

Aye, aye Boss...

Sanj · Post by **Sanj** » Thu Mar 29, 2012 2:55 pm

Nige · Post by **Nige** » Fri Mar 30, 2012 9:52 am

Apart from just buying a new one, is there any way of checking the MAF ?

Nige · Post by **Nige** » Tue May 22, 2012 5:57 am

Bit of an update.

Removed the MAF, cleaned it with Carb cleaner. Decided there was nothing to lose, apart from a bit of time.

Rebuilt it all, went for a long motorway drive the next day.
On the onboard display, it averaged 35.2 at 75mph. Came back the next day, exactly the same route and speed and it averaged 31.1

Went on a much longer run this weekend, over 4 hours each way. Cruise set for 90% of the journey at the same GPS speed. Averaged 34.7 going. On the return leg, exactly the same route and speed (journey was completed in the same time as there was almost no traffic each way), it averaged 31.3.

I have no idea why the consumption should change so much on a 200+ Mile motorway journey between going one day and coming home the next, with almost identical conditions and speed each way.

wilkoturbo · Post by **wilkoturbo** » Tue May 22, 2012 9:09 am

Hey I'll be cleaning mine this weekend any advice on cleaning / pics ??

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