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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 09-28-2012, 10:07 AM
piyu7444 piyu7444 is offline
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Unhappy Gas Mileage Issue on 2008 328i Sedan

I need some help here -------> Bought brand new 328i Sedan in May of 2008 and ever since it has been a great car. I have about 48k Miles on it. I have always used gas from different gas pumps (whatever is available closest)

About a year ago I just started using COSTCO gas (yeah I know a lot of you will say that's badddddddd) but still had no issue with how the car drove or gas mileage.

Just around the expiration of warranty (May 2012) the car show'd a "check engine" light. The dealership looked into the issue and found that the sensors around the exhaust lifters (close to crank shaft) had an issue. They replaced the INTAKE CAM SENSOR as well as the EXHAUST CAM SENSOR WHEEL.

After they did this I felt an issue with the car's acceleration....... While shifting from gear 1 to 2, 2 to 3 etc I could feel a lag as if the gas is being cut out for some seconds. It felt like driving an old stick which gives you a good 'thump' between two gears.

I took it back to them and then they exchanged the sensors from one side to other which did not resolve the issue and I had to take the car back to the dealership (3rd time is a charm)

They changed the above said parts completely again and asked me to "let the car learn my driving pattern" for couple of weeks. That resolved the issue 90% (sometimes it still does it)

Now the issue for which I need help --- After this job was done the CITY GAS Mileage dropped to 14-15 (from 20) and the freeway mileage dropped to 23-24 (from 27+)

Dealership checked the car for possible error code etc and said everything is as good as it can be.........asked me to fill from Chevron..... I started using Chevron gas 100% of times but it did not help at all.

Now I have asked them to get BMW involved in this issue. The service adviser is a great guy and he is not talking to his director about finding a way to fix this issue. They will come back with some answer by Monday but I wanted to see if anyone has experience anything like this or has any advice for me?

A full tank of gas gives 200 miles in city and it sucks! My ML 350 is probably better when it comes to city driving.

HELP PLEASE !!!
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  #2  
Old 09-28-2012, 10:26 AM
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floydarogers floydarogers is offline
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I wonder if the Valvetronic position motor is having problems? Or the Vanos?
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  #3  
Old 09-28-2012, 01:01 PM
piyu7444 piyu7444 is offline
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Thanks floydarogers.........

bump - anyone else?
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  #4  
Old 10-01-2012, 09:29 AM
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08 335Ci 08 335Ci is offline
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Put in a bottle of Chevron's Fuel system cleaner and use good gas, Sunoco, Shell ..... You have NO idea who's gas Costco sells.
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  #5  
Old 10-06-2012, 10:50 AM
piyu7444 piyu7444 is offline
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I am already using Chevron but it has not helped much.
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  #6  
Old 10-06-2012, 10:54 AM
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Orient330iNYC Orient330iNYC is offline
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Quote:
Originally Posted by piyu7444 View Post
I am already using Chevron but it has not helped much.
he means the techron fuel system cleaner.
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  #7  
Old 10-06-2012, 11:04 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by piyu7444 View Post
After they did this I felt an issue with the car's acceleration....... While shifting from gear 1 to 2, 2 to 3 etc I could feel a lag as if the gas is being cut out for some seconds. It felt like driving an old stick which gives you a good 'thump' between two gears.

A clue.

Code[s]?

Clearer thump detail, please.

Cleaned your VANOS solenoids? Or just replace 'em. Easy DIY - at your mileage might be preventative maint.

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Edit: OP's prev posts 2009 - hasn't posted here in over a week - dead thread....


.

Last edited by CALWATERBOY; 10-06-2012 at 11:13 AM.
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  #8  
Old 10-06-2012, 06:48 PM
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pointandgo pointandgo is online now
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Quote:
Originally Posted by CALWATERBOY View Post
A clue.

Code[s]?

Clearer thump detail, please.

Cleaned your VANOS solenoids? Or just replace 'em. Easy DIY - at your mileage might be preventative maint.

__________________________________________________ ________________
Edit: OP's prev posts 2009 - hasn't posted here in over a week - dead thread....


.
Are you kidding me! "Easy DIY," for who? DSX? I'm often proud of myself for finding the windshield wiper fluid refill port.
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  #9  
Old 10-06-2012, 07:04 PM
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Definitely get BMW codes through OBD II ASAP.
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  #10  
Old 10-06-2012, 10:01 PM
piyu7444 piyu7444 is offline
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Orient330iNYC - Thanks for calrifying. I will give it a try.


Saintor - I dont know much so please explain "BMW codes through OBD II ASAP"
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Last edited by piyu7444; 10-06-2012 at 10:11 PM.
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  #11  
Old 10-06-2012, 10:11 PM
piyu7444 piyu7444 is offline
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Quote:
Originally Posted by CALWATERBOY View Post
A clue.

Code[s]?

Clearer thump detail, please.

Cleaned your VANOS solenoids? Or just replace 'em. Easy DIY - at your mileage might be preventative maint.

__________________________________________________ ________________
Edit: OP's prev posts 2009 - hasn't posted here in over a week - dead thread....


.




Thump detail - You can feel when the transmission is changing. You can feel while accelerating as if someone was holding the gear and has suddenly released it to let it move to next level. Earlier to the work done on the car the transmission was as smooth as new but not anymore. Also this will not happen ALWAYS. Its intermittent so does not bother me all the time..... BTW - The dealership called me and said they want to drive my car for 3-4 days to observe what gas mileage it really gets. Once they verify it they plan to get BMW involved.
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  #12  
Old 10-08-2012, 08:29 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by pointandgo View Post
Are you kidding me! "Easy DIY," for who? DSX? I'm often proud of myself for finding the windshield wiper fluid refill port.

Shucks P&G - nothin' to it really - buy a few tools and you're in business! $4-5K, nothin' to it.
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