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MPG gauge problems

Triumvir32010-08-18 18:47:16 +0000 #1
My mpg gauge is bouncing back and forth. If I brake it drops to 12 when I give gas it 'll move up a lil then go back to 12. Very rarely whether braking or giving gas it never goes past 50. Anyone else have this problem? I've searched the forums as well as google and have found nothing. Im still at 35k miles on a 2007 e90 so Im going in for service tomorrow. Like to have an idea of whats going on before I talk with a service adviser. any help would be appreciated. thx
maswastage2010-08-18 18:52:26 +0000 #2
I'm not really sure what you mean. Are you talking about the instantaneous mpg gauge in your instrument cluster? That gauge is supposed to bounce back and forth, because it reads your mpg at each single moment in time. When you accelerate it'll drop below 12 because you're burning more fuel, and when you settle to a cruise or coast to a stop it'll shoot up past 50 because you're hardly using any fuel. Or are you saying that your gauge is just bouncing around randomly?
Triumvir32010-08-18 19:17:04 +0000 #3
I understand how it works. From what I explained in the first post its working basically opposite. when I let off the gas it should go past 50 but it doesnt it stays under 20 and when I brake it goes to 12. even while cruising at the same speed or at the same rpm its bouncing back and forth.
be1ieve11112010-08-18 19:52:41 +0000 #4
its probably not working right. Most useless gauge made.
Oulixes2010-08-18 19:20:31 +0000 #5
Quote:

Originally Posted by be1ieve1111

Most useless gauge made.

+1, there is no point in worrying if it worked or not - whatever it displays is useless. Somebody should write software to make the gauge display something useful, such as oil or water temperature. But then it probably would violate the warranty.
Triumvir32010-08-18 20:10:13 +0000 #6
I agree it is pretty pointless but no excuse for it to act up the way it has. Just wanted to see if anybody knew what caused this problem.

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