MPG dropping.

gonzo · 06-27-2007, 10:01 AM

I was averaging around 18.2 city driving. Then I needed two O2 sensors replaced. Car runs fine but my mileage is now 16 even city. I drive pretty much the same on average. It is not a concern about money so much as is the engine operating properly. Any ideas motor heads? Thanks.

enzo · 06-27-2007, 10:07 AM

I get 15.6 city. Maybe you have been driving more 'normal' lately.

gonzo · 06-27-2007, 04:01 PM

Quote:

Originally Posted by enzo

I get 15.6 city. Maybe you have been driving more 'normal' lately.

I don't know. The car seems to almost bog a little sometimes. I am no guru but I think it may be running rich. ???

Walked U · 06-27-2007, 04:33 PM

Quote:

Originally Posted by gonzo

I was averaging around 18.2 city driving. Then I needed two O2 sensors replaced. Car runs fine but my mileage is now 16 even city. I drive pretty much the same on average. It is not a concern about money so much as is the engine operating properly. Any ideas motor heads? Thanks.

Were you throwing CELS, before you got your O2 senors replaced?

If you were do you know the code?

TiAg335i · 06-27-2007, 06:54 PM

The car comes from the factory tuned. you shouldn't have a problem with running rich.

gonzo · 06-27-2007, 09:14 PM

Quote:

Originally Posted by Walked U

Were you throwing CELS, before you got your O2 senors replaced?

If you were do you know the code?

Someone who knows... I honestly will have to look into all the data. What is your gut feeling? It bogged again a minute ago. I just want to drive.
Slug man I have never felt before when taking off.

Deveray · 06-27-2007, 10:15 PM

Do you have the AC on year round in TX.... or could you have switched it on recently when it wasn't before? That drops mpg by a few

RiXst3r · 06-27-2007, 10:50 PM

Things to check... tire pressure, AC usage(related to outside temp), and traffic patterns... more rush hour traffic lately?

gonzo · 06-28-2007, 03:15 PM

Quote:

Originally Posted by RiXst3r

Things to check... tire pressure, AC usage(related to outside temp), and traffic patterns... more rush hour traffic lately?

Just put on 19" BBS's and put 34 lbs in each tire. Yes the a/c has been on more than when getting 18.2 mpg. But over 2 mpg less??? I am still getting this kind of lurching/bogging sensation that I never had before the service.

OC Guy · 06-28-2007, 04:10 PM

It's getting hot, the heat may do it.

RiXst3r · 06-28-2007, 08:04 PM

Quote:

Originally Posted by gonzo

Just put on 19" BBS's and put 34 lbs in each tire. Yes the a/c has been on more than when getting 18.2 mpg. But over 2 mpg less??? I am still getting this kind of lurching/bogging sensation that I never had before the service.

You mean after your new fuel pump? Ya... mine acts weird now too... sucks, I am just waiting to find a real solution...

BMXtreme · 06-28-2007, 08:19 PM

I am getting 10 mpg man.....not sure if its because there's lights every 2 blocks around my area...

chonko · 06-28-2007, 10:30 PM

It is the weather guys. My average MPG within Houston has dropped from 25 mpg to 21 mpg this month when compared to May.

Stage 2 Drew · 06-29-2007, 12:07 AM

how many miles on your car? you might want to change the air filter if its too dirty

schneid4323 · 06-29-2007, 12:22 AM

your car looks sexy with thoose wheels? what are they? where can i get some?

BK · 06-29-2007, 12:49 AM

Definitely the weather and A/C. I noticed my mpg didn't really drop when switching from my 17" winters to my 18" summers. But this past month, all of a sudden it has really dropped, from ~21-22mpg to ~17-18mpg, with the same driving style.

gonzo · 06-29-2007, 07:19 AM

Quote:

Originally Posted by Stage 2 Drew

how many miles on your car? you might want to change the air filter if its too dirty

8,900 miles. Two O2 sensors replaced, no fuel pump change. The boggy thing is what has me

.

chonko · 06-29-2007, 08:54 AM

Quote:

Originally Posted by Stage 2 Drew

how many miles on your car? you might want to change the air filter if its too dirty

Just did that 2 months ago

Potty_Pants · 06-29-2007, 09:27 AM

there's always ECU wipe (disconnect battery and wait, unless somebody has the reset proceedure for the bmw's)

ppp

G35revup · 06-30-2007, 04:40 AM

wierd, I noticed mine stays around 14.7 and when I first got the car it was more like 19-20mpg. I do always drive in DS, maybe thats why?

E90Russ · 06-30-2007, 11:26 AM

I say the weather! Here in PHX it's night and day w/ the A/C on and A/C off. The thing is the car has so much torque, that the performance hit is just not as easily noticable as say, a Toyota Corolla.

G35revup · 06-30-2007, 05:03 PM

One thing I love about turbo cars is the feeling of moving effortlessly. I would think the max torque at low rpm's gives the car this feel.

06-27-2007, 10:01 AM	#1
gonzo Lieutenant General 10320 Rep 14,446 Posts Drives: as many as possible Join Date: Jan 2007 Location: TeXXXas iTrader: (0)	MPG dropping. I was averaging around 18.2 city driving. Then I needed two O2 sensors replaced. Car runs fine but my mileage is now 16 even city. I drive pretty much the same on average. It is not a concern about money so much as is the engine operating properly. Any ideas motor heads? Thanks. __________________ Crazy Diamond
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06-27-2007, 10:07 AM	#2
enzo Enlisted Member 6 Rep 31 Posts Drives: KTM 525 Join Date: Aug 2006 Location: Calif. iTrader: (0)	I get 15.6 city. Maybe you have been driving more 'normal' lately. __________________ E92 335 MT, Sport....Trailer hitch
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06-27-2007, 06:54 PM	#5
TiAg335i Trance Life 333 Rep 4,706 Posts Drives: 2007 E92 335i Join Date: Jan 2007 Location: Long Island, NY iTrader: (4)	The car comes from the factory tuned. you shouldn't have a problem with running rich.
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06-27-2007, 10:15 PM	#7
Deveray Private First Class 11 Rep 141 Posts Drives: 2010 535i X-Drive Touring Join Date: Dec 2006 Location: Colorado iTrader: (0)	Do you have the AC on year round in TX.... or could you have switched it on recently when it wasn't before? That drops mpg by a few
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06-27-2007, 10:50 PM	#8
RiXst3r 287 Rep 6,510 Posts Drives: M235i Join Date: Sep 2006 Location: Ohio iTrader: (14)	Things to check... tire pressure, AC usage(related to outside temp), and traffic patterns... more rush hour traffic lately?
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06-28-2007, 04:10 PM	#10
OC Guy General 559 Rep 18,123 Posts Drives: AW 335D E90 Join Date: Oct 2006 Location: Irvine/Aliso Viejo, CA iTrader: (9) Garage List 2007 335i [0.00]	It's getting hot, the heat may do it. __________________ Current: 2010 Alpine White 335D LCI l 19" BBS LMs l KW V2 Coilovers l BMW Performance Grilles l MSport Front/Rear l Karbonwerke Trunk l F1 Pinnacle Tint 35% Former: E92 Space Grey 335i Latest pics
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06-28-2007, 08:19 PM	#12
BMXtreme Lieutenant Colonel 63 Rep 1,657 Posts Drives: E60 535i Join Date: May 2007 Location: Redmond, WA iTrader: (3) Garage List 2006 330i [0.00]	I am getting 10 mpg man.....not sure if its because there's lights every 2 blocks around my area...
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06-28-2007, 10:30 PM	#13
chonko First Lieutenant 11 Rep 369 Posts Drives: X6 50i/2008 X5 4.8i Join Date: Jan 2006 Location: Undercover iTrader: (0)	It is the weather guys. My average MPG within Houston has dropped from 25 mpg to 21 mpg this month when compared to May.
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06-29-2007, 12:07 AM	#14
Stage 2 Drew Second Lieutenant 9 Rep 206 Posts Drives: an SRT4 that beats ur 335 :-) Join Date: Apr 2007 Location: teh 909 iTrader: (0)	how many miles on your car? you might want to change the air filter if its too dirty
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06-29-2007, 12:22 AM	#15
schneid4323 Banned 345 Rep 1,134 Posts Drives: 335i, M6 Join Date: Dec 2006 Location: Dallas TX iTrader: (0)	your car looks sexy with thoose wheels? what are they? where can i get some?
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06-29-2007, 12:49 AM	#16
BK Smiling politely 176 Rep 7,931 Posts Drives: 330i Join Date: Feb 2006 Location: Washington DC iTrader: (0) Garage List 2006 330i [9.00]	Definitely the weather and A/C. I noticed my mpg didn't really drop when switching from my 17" winters to my 18" summers. But this past month, all of a sudden it has really dropped, from ~21-22mpg to ~17-18mpg, with the same driving style. __________________ E90 330i Black Sapphire 6MT \| 991.1 C4 Platinum Silver 7MT
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06-29-2007, 09:27 AM	#19
Potty_Pants Colonel 70 Rep 2,189 Posts Drives: 2012 Genesis Sedan Rspec Join Date: Apr 2007 Location: Southern NJ iTrader: (0)	there's always ECU wipe (disconnect battery and wait, unless somebody has the reset proceedure for the bmw's) ppp __________________ Olds Starfire > Chevy Malibu > Isuzu I-mark RS & Honda Magna 500 > Grand Am GT & YSR50 > Nissan Maxima & Ninja 750 > X-Wife > Hyundai Excel > Honda Prelude > Honda Accord > Honda Prelude & Ninja 250> Infiniti G35 > E90 335i > Hyundai Genesis Rspec, Hyunadai Sonata > Kia Sorento > Honda CRV-EX
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06-30-2007, 04:40 AM	#20
G35revup V3 Power 21 Rep 358 Posts Drives: Space gray 335i Join Date: Nov 2006 Location: Tampa, Fl. iTrader: (1)	wierd, I noticed mine stays around 14.7 and when I first got the car it was more like 19-20mpg. I do always drive in DS, maybe thats why?
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06-30-2007, 11:26 AM	#21
E90Russ Banned 15 Rep 363 Posts Drives: 2007 335i Sedan (E90) Join Date: May 2007 Location: PHX, AZ iTrader: (0)	I say the weather! Here in PHX it's night and day w/ the A/C on and A/C off. The thing is the car has so much torque, that the performance hit is just not as easily noticable as say, a Toyota Corolla.
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06-30-2007, 05:03 PM	#22
G35revup V3 Power 21 Rep 358 Posts Drives: Space gray 335i Join Date: Nov 2006 Location: Tampa, Fl. iTrader: (1)	One thing I love about turbo cars is the feeling of moving effortlessly. I would think the max torque at low rpm's gives the car this feel.
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