WTF ... Now getting even worse economy

TheBlondeFella · 11-21-2013, 03:02 PM

So the car went into my local dealer last month for a misfire and EML illumination. They changed 2 injectors, 2 coils, cleaned out the cat and changed the plugs. Prior to this visit they changed the nox sensor.

Before the last visit I was getting an average of 27mpg which I thought was terrible for a 2 litre engine. I'm not surprised said the dealer if you have an engine problem.

2 tanks of fuel later and I've now averaged 25mpg for both tanks despite driving like a granny!

I know its got colder and the engine is taking longer to warm up but 25mpg from a 2 litre engine is ridiculous, even a heavy e93 M Sport 320i! If it was a 3 litre engine and I was reving the nuts off it in every gear then I'd be quite happy with 25 mpg but not from this!

Any ideas? Oh and I still have an occassional very slight stutter / hiccup / misfire too!

D_Boi · 11-21-2013, 03:38 PM

Quote:

Originally Posted by TheBlondeFella

So the car went into my local dealer last month for a misfire and EML illumination. They changed 2 injectors, 2 coils, cleaned out the cat and changed the plugs. Prior to this visit they changed the nox sensor.

Before the last visit I was getting an average of 27mpg which I thought was terrible for a 2 litre engine. I'm not surprised said the dealer if you have an engine problem.

2 tanks of fuel later and I've now averaged 25mpg for both tanks despite driving like a granny!

I know its got colder and the engine is taking longer to warm up but 25mpg from a 2 litre engine is ridiculous, even a heavy e93 M Sport 320i! If it was a 3 litre engine and I was reving the nuts off it in every gear then I'd be quite happy with 25 mpg but not from this!

Any ideas? Oh and I still have an occassional very slight misfire top!

I'm so glad I'm not alone on this....

My car is the same as yours and I was averaging 27mpg but since it went in 2 weeks ago for a NOx sensor and coil plugs it now averages 24/25mpg!!!

Its really getting on my nerves, I've even started to use super unleaded hoping it would make a difference and it hasn't at all!

makkan00 · 11-21-2013, 04:00 PM

They may have updated the engine firmware on your car as well. It could be that it sits on that mpg with the new parts and firmware.
I truly think that it is too early to discuss it as weather is against you guys.

blues n twos · 11-21-2013, 09:30 PM

That's not good mate. It should be better.

I'm getting 29mpg from mine running about town. And you know what I've got.

Vauxhalls 1.8 petrol insignias had the same issues. They were doing the same mpg as the vxr and that was a V6 2.8 twin turbo with 360bhp!!!

Jon

TheBlondeFella · 11-22-2013, 02:46 AM

It really is disgusting. One of the reasons. I got a 320i over a 330 was due to it supposedly being more economical.

I understand engines take longer to warm up when it's colder .... but ... It really isn't that cold yet.

I also use super unleaded all the time ... what a waste of cash it would seem!

Dickisafc · 11-22-2013, 02:59 AM

I have a 118i and just had nox sensor fit and I too have noticed my consumption has fell from 32- 26

jyong1981 · 11-22-2013, 03:05 AM

Quote:

Originally Posted by TheBlondeFella

So the car went into my local dealer last month for a misfire and EML illumination. They changed 2 injectors, 2 coils, cleaned out the cat and changed the plugs. Prior to this visit they changed the nox sensor.

Before the last visit I was getting an average of 27mpg which I thought was terrible for a 2 litre engine. I'm not surprised said the dealer if you have an engine problem.

2 tanks of fuel later and I've now averaged 25mpg for both tanks despite driving like a granny!

I know its got colder and the engine is taking longer to warm up but 25mpg from a 2 litre engine is ridiculous, even a heavy e93 M Sport 320i! If it was a 3 litre engine and I was reving the nuts off it in every gear then I'd be quite happy with 25 mpg but not from this!

Any ideas? Oh and I still have an occassional very slight misfire top!

I'm getting 26mpg from my 2008 e90 330i manual and The e93 320i has pretty much identical combined mpg figures (39 for auto, 41 for manual) so it doesn't sound unreasonable for our mpg to be the same.

I do mostly short 4 mile journeys to work each day, am guessing yours is similar?

Funnily enough I also got new injectors, coils and spark plugs earlier this year and noticed a small drop in mpg! Have read this a few times now, maybe the newest injectors are less efficient but more reliable! Hopefully!

CustomColours · 11-22-2013, 04:20 AM

I put it down to an underpowered engine pushing along an pretty heavy car. Baring in mind a 4 cycle isnt bmw's forte now is it. My brother has a 130 hatch and it averages 34.....ish. bare in mind its a little lighter. But even with the weight even if it hit the same mpg as you, you'd have a 6 cycle 3.0 ltr.

11-21-2013, 03:02 PM	#1
TheBlondeFella First Lieutenant 40 Rep 386 Posts Drives: E93 320i M Sport Join Date: Jun 2013 Location: Surrey, UK iTrader: (3)	WTF ... Now getting even worse economy - e93 320i So the car went into my local dealer last month for a misfire and EML illumination. They changed 2 injectors, 2 coils, cleaned out the cat and changed the plugs. Prior to this visit they changed the nox sensor. Before the last visit I was getting an average of 27mpg which I thought was terrible for a 2 litre engine. I'm not surprised said the dealer if you have an engine problem. 2 tanks of fuel later and I've now averaged 25mpg for both tanks despite driving like a granny! I know its got colder and the engine is taking longer to warm up but 25mpg from a 2 litre engine is ridiculous, even a heavy e93 M Sport 320i! If it was a 3 litre engine and I was reving the nuts off it in every gear then I'd be quite happy with 25 mpg but not from this! Any ideas? Oh and I still have an occassional very slight stutter / hiccup / misfire too! Last edited by TheBlondeFella; 11-22-2013 at 03:38 AM..
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11-21-2013, 04:00 PM	#3
makkan00 Major General 898 Rep 9,105 Posts Drives: F83 and F36 Join Date: Dec 2011 Location: Essex iTrader: (56)	They may have updated the engine firmware on your car as well. It could be that it sits on that mpg with the new parts and firmware. I truly think that it is too early to discuss it as weather is against you guys. __________________ F36 Xdrive for her - HUD, park assist, heated steering wheel, rear camera, Apple car play F36 RWD for him - HK, M sports pack, GTS tail light, Apple car play
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11-21-2013, 09:30 PM	#4
blues n twos Lieutenant 35 Rep 497 Posts Drives: BMW M4 DCT coupe Join Date: Jun 2013 Location: Beaconsfield, Bucks iTrader: (1)	That's not good mate. It should be better. I'm getting 29mpg from mine running about town. And you know what I've got. Vauxhalls 1.8 petrol insignias had the same issues. They were doing the same mpg as the vxr and that was a V6 2.8 twin turbo with 360bhp!!! Jon __________________ 2015 M4 DCT Mineral White + carbon pack
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11-22-2013, 02:46 AM	#5
TheBlondeFella First Lieutenant 40 Rep 386 Posts Drives: E93 320i M Sport Join Date: Jun 2013 Location: Surrey, UK iTrader: (3)	It really is disgusting. One of the reasons. I got a 320i over a 330 was due to it supposedly being more economical. I understand engines take longer to warm up when it's colder .... but ... It really isn't that cold yet. I also use super unleaded all the time ... what a waste of cash it would seem!
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11-22-2013, 02:59 AM	#6
Dickisafc Private 3 Rep 88 Posts Drives: 3 series coupe Join Date: Aug 2013 Location: Sunderland iTrader: (0)	I have a 118i and just had nox sensor fit and I too have noticed my consumption has fell from 32- 26
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11-22-2013, 04:20 AM	#8
CustomColours Banned 16 Rep 791 Posts Drives: 335i SE Join Date: Apr 2012 Location: Hertfordshire iTrader: (0)	I put it down to an underpowered engine pushing along an pretty heavy car. Baring in mind a 4 cycle isnt bmw's forte now is it. My brother has a 130 hatch and it averages 34.....ish. bare in mind its a little lighter. But even with the weight even if it hit the same mpg as you, you'd have a 6 cycle 3.0 ltr.
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