Computer says 8 mpg?!?!

tacoman · 09-10-2021, 06:48 PM

Had my TA's replaced and replaced valve cover gaskets too. Tech called and said.computer indicates car is getting 8 mpg when driven now.
I always get 13mpg city..

Will it reset as i continue to drive it?
O2 sensors.maybe?

Curious...

2011E90ZCP · 09-10-2021, 11:29 PM

Sounds like that tech is having some serious fun with your car! Next he is gonna tell you the rear tires are bald; common side effect of TA replacement...

Idfkman · 09-10-2021, 11:51 PM

Quote:

Originally Posted by sitzlejd

Sounds like that tech is having some serious fun with your car! Next he is gonna tell you the rear tires are bald; common side effect of TA replacement...

My tire guy always goes on an extended test drive to "check the tire balance" lol. I never have to sit in a waiting room and he cut me a deal every time I come in, so fine by me. He drives a super clean e39 M5.

Regarding MPG - have you reset the calculator in the gauge cluster? Also could be bad gas?

tacoman · 09-11-2021, 06:21 AM

Quote:

Originally Posted by Idfkman

My tire guy always goes on an extended test drive to "check the tire balance" lol. I never have to sit in a waiting room and he cut me a deal every time I come in, so fine by me. He drives a super clean e39 M5.

Regarding MPG - have you reset the calculator in the gauge cluster? Also could be bad gas?

Lol.
Well....
That would be better than throwing money at car trying to figure out the issue (o2 sensors, plugs, injectors, map sensor).. ..

Re calculator..he said he reset it.
Re gas...i use shell gas 90% of the time. Granted...i did have a mostly full tank if gas when i dropped the car off last week.

I asked him to use a code reader. Maybe a non critical code stored could ID an intermittent problem....aka a clue!

tacoman · 09-11-2021, 06:22 AM

Quote:

Originally Posted by sitzlejd

Sounds like that tech is having some serious fun with your car! Next he is gonna tell you the rear tires are bald; common side effect of TA replacement...

Eja144 · 09-11-2021, 05:16 PM

Did you notice if the time/date and trip odometer have been reset? Sounds like it could be a battery thing.

tacoman · 09-11-2021, 09:08 PM

Quote:

Originally Posted by Eja144

Did you notice if the time/date and trip odometer have been reset? Sounds like it could be a battery thing.

Car is still w my tech/mechanic...so i am going on his word in terms of the reset.

Hmm.. Now that i think about it re battery...in the last year the yellow battery light did come on 2x during initial startup...but disappeared (no issues otherwise). Definite warning signs that battery is on the way out (maybe regulator..maybe alternator ) for sure. Battery/alternator might be the issue....or fuel regulator/sensor....or all of em.

Spark plugs are ok as the bmw dealership put a new block in @ 22k miles (4.5 years) ago.
I dont think the o2 sensors were ever replaced though.

Wish i had a lift in the garage....

tacoman · 09-11-2021, 09:29 PM

Well..if it were a fuel regulator/sensor...codes would have been thrown.

Forgot...i replaced the fuel transfer pump...before the TA's. Maybe i need to give the car time to recalculate. Maybe ECU needs to be reset

pbonsalb · 09-12-2021, 10:45 AM

That is the fun meter! The lower it reads the more fun you have been having.

tacoman · 10-08-2021, 07:24 PM

Ecu reset and new battery (had 9v) ....and actually driving the car .....worked.
13mpg city
22 -23 highway

decimation1 · 10-12-2021, 11:44 AM

8-10mpg is normal for me in town, right foot is heavy....

imserious · 10-12-2021, 12:31 PM

You've been hooned. This is your MPG when tracking.

decimation1 · 10-12-2021, 12:46 PM

Quote:

Originally Posted by imserious

You've been hooned. This is your MPG when tracking.

Ha! Oddly, never even checked mileage after a track day, although I fill up twice!!!

imserious · 10-13-2021, 11:09 PM

Quote:

Originally Posted by decimation1

Quote:

Originally Posted by imserious

You've been hooned. This is your MPG when tracking.

Ha! Oddly, never even checked mileage after a track day, although I fill up twice!!!

Do it. It's fun!

09-10-2021, 06:48 PM	#1
tacoman First Lieutenant 85 Rep 356 Posts Drives: 1989 E30 M3 and 2010 E90 M3 Join Date: Oct 2013 Location: Ft Lauderdale, FL iTrader: (0)	Computer says 8 mpg?!?! Had my TA's replaced and replaced valve cover gaskets too. Tech called and said.computer indicates car is getting 8 mpg when driven now. I always get 13mpg city.. Will it reset as i continue to drive it? O2 sensors.maybe? Curious...
	Appreciate 0 Tweet Quote

09-10-2021, 11:29 PM	#2
2011E90ZCP Private 138 Rep 93 Posts Drives: 2011 BMW M3 E90 ZCP Join Date: Feb 2021 Location: Ohio iTrader: (0)	Sounds like that tech is having some serious fun with your car! Next he is gonna tell you the rear tires are bald; common side effect of TA replacement...
	Appreciate 4 Idfkman473.00 Dpc2u11503.00 WalkerM34.50 chocstraw495.50 Quote

09-11-2021, 05:16 PM	#6
Eja144 Second Lieutenant 303 Rep 298 Posts Drives: 2008 E90 M3 Join Date: Jun 2019 Location: Long Island, NY iTrader: (0)	Did you notice if the time/date and trip odometer have been reset? Sounds like it could be a battery thing.
	Appreciate 0 Quote

09-11-2021, 09:29 PM	#8
tacoman First Lieutenant 85 Rep 356 Posts Drives: 1989 E30 M3 and 2010 E90 M3 Join Date: Oct 2013 Location: Ft Lauderdale, FL iTrader: (0)	Well..if it were a fuel regulator/sensor...codes would have been thrown. Forgot...i replaced the fuel transfer pump...before the TA's. Maybe i need to give the car time to recalculate. Maybe ECU needs to be reset Last edited by tacoman; 09-11-2021 at 09:50 PM..
	Appreciate 0 Quote

09-12-2021, 10:45 AM	#9
pbonsalb Lieutenant General 5216 Rep 10,601 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	That is the fun meter! The lower it reads the more fun you have been having.
	Appreciate 0 Quote

10-08-2021, 07:24 PM	#10
tacoman First Lieutenant 85 Rep 356 Posts Drives: 1989 E30 M3 and 2010 E90 M3 Join Date: Oct 2013 Location: Ft Lauderdale, FL iTrader: (0)	Ecu reset and new battery (had 9v) ....and actually driving the car .....worked. 13mpg city 22 -23 highway
	Appreciate 0 Quote

10-12-2021, 11:44 AM	#11
decimation1 First Lieutenant 196 Rep 386 Posts Drives: 08 e90 MT Join Date: Dec 2015 Location: Virginia iTrader: (1)	8-10mpg is normal for me in town, right foot is heavy....
	Appreciate 0 Quote

10-12-2021, 12:31 PM	#12
imserious Major 412 Rep 1,049 Posts Drives: 2011 E92 M3 MR Join Date: Jan 2013 Location: Orange County, CA iTrader: (4)	You've been hooned. This is your MPG when tracking.
	Appreciate 0 Quote