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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-29-2012, 04:35 PM   #1
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Join Date: Aug 2012
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My Ride: 2001 330i
MPG drops while stopping?

I've noticed recently that when coming to a stop, my MPG dial will dart quickly to 0 then bounce back to 100 once at a full stop. It also makes a slight compression sound when bouncing back to 100, it sounds similar to when you leak air out of a tire.

I don't think it's affecting my mileage (20.4mpg is my average), but it's not normal, right - coming to a stop shouldn't lower MPG. I had a bunch of hoses replaced a month ago, but maybe there's a leak or I need a new sensor? Ideas?

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Old 09-29-2012, 04:40 PM   #2
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Old 09-29-2012, 06:17 PM   #3
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is it possibly the gauge cluster making the noise? mine does that too on the mpg gauge when it travels a long distance SOMETIMES, such as 12mpg to 50... only does it like once car ride kinda weird but i don't really mind, prob just needs some oil on the little motor.

Last edited by blksab65; 09-29-2012 at 06:18 PM.
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Old 09-30-2012, 02:00 PM   #4
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Mine did this but then I cleaned my MAF sensor it now only drops to 25 then resets

Last edited by THECLEANERBEAMER; 09-30-2012 at 02:02 PM.
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Old 09-30-2012, 02:03 PM   #5
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My mpg gauge makes a noise when the needle move a lot quickly too. Never thought much of it.
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Old 03-27-2013, 02:43 AM   #6
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My cluster makes a noise to, thought I had a air leak, when I put my foot down I heard a sort of compression noise, from behind the dials, I took the cluster out and what I thought was air leak was just a really fast ticking noise from on of the dials, in guessing its my mpg dial coz when I hear this noise that's when it start moving, it does my head in but at the same time no air leak that I was getting bit worried about, need to strip the cluster down in see if I can stop the noise,
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Old 03-27-2013, 09:34 AM   #7
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Never noticed the noise but my needle does swing to the right as I roll to a stop. I don't think it matters. Even if it fell off, I wouldn't care. I think they should have put an oil pres. gage there.
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Old 03-27-2013, 02:35 PM   #8
David McMahon
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My 328 also drops when engine braking (coming upto lights with no brakes)
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