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E60 (2004 - 2010)
BMW 5-Series (E60 chassis) was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E60 is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 09-03-2013, 07:56 PM
Kushp14 Kushp14 is offline
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Still Bad MPG !

Talked to my indy about the fact I'm getting horrible MPG on my 530i w/115k.. He keeps on insisting everything is fine, but i think otherwise.. Even with babying it, I only get 200miles/tank in city!

Spark plugs are only 15k old.. what else can contribute to this??

Thanks !
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  #2  
Old 09-03-2013, 08:39 PM
njlou njlou is online now
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Here is a great stab in the dark!!!

Could you possibly have a clogged (secondary) air filter ie the charcoal one???
I doubt if it has ever been replaced in 115k. I am told that they are expensive and not really needed, and some delete it for better mileage.
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  #3  
Old 09-04-2013, 04:44 AM
pcy pcy is offline
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20 MPG in the city may not be bad for 530i, assuming tires are all properly inflated, no codes are present, and there are no roof/bicycle racks are added to the car.

Try to remove unnecessary stuff from the car as much as possible. Consider replacing O2 sensors (pre-cat sensors).
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  #4  
Old 09-05-2013, 12:22 PM
quinby1 quinby1 is offline
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20mpg? The OP stated 200miles/tank which is significantly less than 20mpg.
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  #5  
Old 09-05-2013, 02:05 PM
Kushp14 Kushp14 is offline
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Quote:
Originally Posted by quinby1 View Post
20mpg? The OP stated 200miles/tank which is significantly less than 20mpg.
Yeah I wish 20mpg lol
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  #6  
Old 09-05-2013, 02:05 PM
Kushp14 Kushp14 is offline
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Quote:
Originally Posted by njlou View Post
Here is a great stab in the dark!!!

Could you possibly have a clogged (secondary) air filter ie the charcoal one???
I doubt if it has ever been replaced in 115k. I am told that they are expensive and not really needed, and some delete it for better mileage.
Alright I'll give it a look, thanks !
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  #7  
Old 09-05-2013, 02:35 PM
pcy pcy is offline
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Sorry, my bad. I misread OP's post.

200miles per tank (around 16 gal.) That's little more than 12 mpg. Spark plugs changed? If not, change now. Air filter clean? If not, replace with new filter. Make sure tire pressure is at the recommended level. See if any of the brake calipers are sticking (see if any of the rotor is wearing excessively). Consider replacing O2 sensors.

The charcoal filter that's located in the intake filter box above the engine air filter shouldn't cause any drop in mileage, unless the engine air filter is really damaged and causing the dirt/leaves to get stuck to that charcoal filter. I have removed that charcoal filter and I didn't notice any difference (not in the engine noise and not in gas mileage). My comments are from experience with '06 530i (with N52 engine).

Connect the OBD port to INPA or diagnostic code reader and see if there are any codes - EVEN IF the 'check-engine' light is not on. There may be pending codes that may lead you in the right direction.
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  #8  
Old 09-05-2013, 07:24 PM
quinby1 quinby1 is offline
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I hope you figure out this problem soon cause that's a lot $$ at the pump.
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  #9  
Old 09-05-2013, 08:03 PM
Kushp14 Kushp14 is offline
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Quote:
Originally Posted by pcy View Post
Sorry, my bad. I misread OP's post.

200miles per tank (around 16 gal.) That's little more than 12 mpg. Spark plugs changed? If not, change now. Air filter clean? If not, replace with new filter. Make sure tire pressure is at the recommended level. See if any of the brake calipers are sticking (see if any of the rotor is wearing excessively). Consider replacing O2 sensors.

The charcoal filter that's located in the intake filter box above the engine air filter shouldn't cause any drop in mileage, unless the engine air filter is really damaged and causing the dirt/leaves to get stuck to that charcoal filter. I have removed that charcoal filter and I didn't notice any difference (not in the engine noise and not in gas mileage). My comments are from experience with '06 530i (with N52 engine).

Connect the OBD port to INPA or diagnostic code reader and see if there are any codes - EVEN IF the 'check-engine' light is not on. There may be pending codes that may lead you in the right direction.
Im going to take it in next week for a complete check, so ill mention to check the filters and O2 sensors... Plugs are fairly new. I was told the fuel filter is not a serviceable item ?

Yes, hopefully there is some kind of code present related to this..
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  #10  
Old 09-05-2013, 08:08 PM
Kushp14 Kushp14 is offline
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Quote:
Originally Posted by quinby1 View Post
I hope you figure out this problem soon cause that's a lot $$ at the pump.
I know its horrible.. Im hoping this has nothing to do with high mileage and something that can be fixed in order the achieve the better MPG's I used to before..
even on highways speeds 75-80 on long road trips = 300 miles/ TANK !

Was never this bad before !

Last edited by Kushp14; 09-05-2013 at 08:11 PM.
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  #11  
Old 09-06-2013, 04:21 AM
pcy pcy is offline
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Quote:
Originally Posted by Kushp14 View Post
I know its horrible.. Im hoping this has nothing to do with high mileage and something...
My '06 530i has 134K miles and it gets around 20 MPG with local driving and 29-30 on 100% highway driving.

Some misbehaving/failed/failing part(s)/sensor(s) contributing to bad mileage. Your mechanic will need to go thru process of elimination and identify the culprits.
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  #12  
Old 09-06-2013, 06:43 AM
l1tech l1tech is offline
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The FIRST thing one needs to look at when addressing a mpg concern is the fuel trims. Poor mpg will definitely show up in a change in fuel trims from what they should normally be.
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  #13  
Old 09-06-2013, 07:56 PM
Kushp14 Kushp14 is offline
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Quote:
Originally Posted by pcy View Post
My '06 530i has 134K miles and it gets around 20 MPG with local driving and 29-30 on 100% highway driving.

Some misbehaving/failed/failing part(s)/sensor(s) contributing to bad mileage. Your mechanic will need to go thru process of elimination and identify the culprits.
Then something has to be wrong.. Hopefully the cause of issue can be found.
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  #14  
Old 09-13-2013, 03:13 PM
Kushp14 Kushp14 is offline
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SO….. I have a bad left fuel sensor which making it look like I always have low fuel.. Looking to purchase online and have dealer install.

Also dealer recommended to replace spark plugs, because the ones I got 2 years ago@ 100k which were bosh are supposedly not correct. I haven't have any issues relating to spark plugs, so is it necessary ?

Last edited by Kushp14; 09-13-2013 at 03:17 PM.
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  #15  
Old 09-13-2013, 04:31 PM
amitkumararora5 amitkumararora5 is offline
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Quote:
Originally Posted by Kushp14 View Post
SO….. I have a bad left fuel sensor which making it look like I always have low fuel.. Looking to purchase online and have dealer install.

Also dealer recommended to replace spark plugs, because the ones I got 2 years ago@ 100k which were bosh are supposedly not correct. I haven't have any issues relating to spark plugs, so is it necessary ?
How did the mechanic diagnosed this ?
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  #16  
Old 09-13-2013, 04:44 PM
Kushp14 Kushp14 is offline
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Originally Posted by amitkumararora5 View Post
How did the mechanic diagnosed this ?
A code was pulled
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  #17  
Old 09-13-2013, 07:27 PM
schpenxel schpenxel is offline
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Quote:
Originally Posted by Kushp14 View Post
SO….. I have a bad left fuel sensor which making it look like I always have low fuel.. Looking to purchase online and have dealer install.

Also dealer recommended to replace spark plugs, because the ones I got 2 years ago@ 100k which were bosh are supposedly not correct. I haven't have any issues relating to spark plugs, so is it necessary ?
Doubt spark plugs are necessary. Can't hurt, but also aren't hard at all to do yourself
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  #18  
Old 09-13-2013, 07:38 PM
Kushp14 Kushp14 is offline
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Originally Posted by schpenxel View Post
Doubt spark plugs are necessary. Can't hurt, but also aren't hard at all to do yourself
the only issue i have is slight hesitation which i thought was transmission related.. but there were no codes related to tranny.. then mechanic advised me I'm using the wrong spark plugs.. Not sure if changing them this early will benefit or just be a waste of money.

As for the MPG issue, replacing the fuel level should sensor should resolve that.
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  #19  
Old 09-14-2013, 05:45 AM
txag_530i's Avatar
txag_530i txag_530i is offline
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You can get the fuel level sensor at any number of places.

fcpeuro.com
autohausaz.com
rockauto.com
rmeuropean.com

The part will be about $135 and includes a new filter. You should find an independent mechanic to do this kind of work for you as his hourly rates will be much cheaper.
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  #20  
Old 09-14-2013, 05:54 AM
kelhasna kelhasna is online now
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Still Bad MPG !

Replace the spark plugs if they are not the correct ones, they are only $6/each.
Replace the o2 sensor that the mechanic recommended and see what happens


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  #21  
Old 09-14-2013, 08:38 AM
Kushp14 Kushp14 is offline
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Quote:
Originally Posted by kelhasna View Post
Replace the spark plugs if they are not the correct ones, they are only $6/each.
Replace the o2 sensor that the mechanic recommended and see what happens


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He didnt mention anything about the o2 sensor, I think you mean fuel level sensor ..but I may up end replacing plugs, just frustrating that the first time I was supposed to get oem bosh but they still aren't correct.
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  #22  
Old 09-14-2013, 09:02 AM
vadimr vadimr is offline
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Quote:
Originally Posted by Kushp14 View Post
He didnt mention anything about the o2 sensor, I think you mean fuel level sensor ..but I may up end replacing plugs, just frustrating that the first time I was supposed to get oem bosh but they still aren't correct.
Just wondering, could how level sensor be related to poor MPG? Are you calculating MPG based on what the car spits out at you or are you taking the number of miles driven and dividing it by the number of gallons you filled up?
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  #23  
Old 09-14-2013, 09:03 AM
Kushp14 Kushp14 is offline
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Quote:
Originally Posted by txag_530i View Post
You can get the fuel level sensor at any number of places.

fcpeuro.com
autohausaz.com
rockauto.com
rmeuropean.com

The part will be about $135 and includes a new filter. You should find an independent mechanic to do this kind of work for you as his hourly rates will be much cheaper.
The dealer wants $430 just in labor to do the job .. Ive been having bad experiences with Indys not being trustworthy at all, so I'm ill try to work it out with my dealer.

Last edited by Kushp14; 09-14-2013 at 09:11 AM.
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  #24  
Old 09-14-2013, 09:10 AM
Kushp14 Kushp14 is offline
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Originally Posted by vadimr View Post
Just wondering, could how level sensor be related to poor MPG? Are you calculating MPG based on what the car spits out at you or are you taking the number of miles driven and dividing it by the number of gallons you filled up?
I've just been noticing my gas gauge decreases quickly after little driving..
For example ill full the tank then reset odo, then with easy highway and city diving it's half tank after about 100 miles.
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  #25  
Old 09-14-2013, 02:17 PM
vadimr vadimr is offline
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Quote:
Originally Posted by Kushp14 View Post
I've just been noticing my gas gauge decreases quickly after little driving..
For example ill full the tank then reset odo, then with easy highway and city diving it's half tank after about 100 miles.
Yes I understand what you mean, but that does not provide any information. Look at your receipt, how many gallons did you filled up and compare with how many miles you had driven. Even if the fuel level sensor was totally broken and always showed your car is empty it would not change the MPG, real MPG that is, not what iDrive provides you with. Get the real MPG first, then troubleshoot the issue, if there is one.
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