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#145940 - 4th Jan 2007 7:11pm Crap MPG at Idle
BMW Joe Offline
Wiki Master

Registered: 30th Apr 2006
Posts: 12369
Loc: Birkenhead
Only recently, in the past week or so, I've been getting really
crap MPG. thumbsdown

I had about 3/4 of a tank last week and up to 1/2 a tank, I had
over 120 miles out of it and the MPG gauge showed I was getting
around 40mpg at idle and during accelartion.

However, now, the MPG gauge is showing only 15mpg when idle and
during acceleration and it's used 1/2 a tank plus an extra 15
worth in less than 60 miles.

This only happens when idle or accelerating. During normal
driving, the gauge returns to above 50mpg, but then when slowing
down, It goes back to 15mpg frown .

Any ideas whats causing this? Faulty MAF perhaps? Worn cams
aswell?
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#145944 - 4th Jan 2007 7:29pm Re: Crap MPG at Idle [Re: BMW Joe]
Johnny Alan Offline
Forum Addict

Registered: 15th Sep 2004
Posts: 2082
Loc: wirral
how do you get any miles per gallon at idle when your not moving?? Should read 0mpg at idle, and your MPG is always crap whne you accelerate from stand still. Read the mpg when going a steady 40mph etc not when pulling off. to achieve a good mpg you must be traveling atleast 60mph constant, what your saying sounds about right to me. also you can not judge the amount of fuel used by the gauge as the shape of tank will vary this eg the tank could be smaller at the bottom and so when the float falls it falls quicker the lower it gets. In other word you may put 60 in for a full tank and when it is half way on the gauge it doesnt mean their is anotheer 30 in it possible more like 15-20
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#145949 - 4th Jan 2007 7:38pm Re: Crap MPG at Idle [Re: Johnny Alan]
BMW Joe Offline
Wiki Master

Registered: 30th Apr 2006
Posts: 12369
Loc: Birkenhead
Yeah, I know that it should read 0 at idle, and when you
accelerate, but according to the gauge it's a lot worse than it
normally is, unless the gauge is faulty.

Even if it is faulty, for the same amount of mileage it's been
using a lot more fuel the in past week then it ever has done
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#145950 - 4th Jan 2007 7:43pm Re: Crap MPG at Idle [Re: BMW Joe]
scoop Offline
Wiki Addict

Registered: 18th Nov 2004
Posts: 7238
Loc: Leuchars
reasons for excess fuel comsuption are either faulty sensors, making the car think its not providing enough fuel when it is,therefore it piles far too much in, or ur plugs/leads/packs are weak and it takes more fuel just to get keep the power there. Does the car feel any different performance wise,and is there a smell of petrol from the exhaust?

ur car doesnt drive at idle mate,unless ur reffering to slotting it into neutral and coasting? in which case ur MPG guage shud read LOADS of miles per gallon,do u mean "closed throttle"? (which is when ur foot is off the peddle and the car is slowing down/revs are dropping?
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#145956 - 4th Jan 2007 8:22pm Re: Crap MPG at Idle [Re: scoop]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
The MPG gauge on the BMWs work of the vacume on the inlet system - check all the breather hoses are clear.
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#145966 - 4th Jan 2007 11:43pm Re: Crap MPG at Idle [Re: scoop]
BMW Joe Offline
Wiki Master

Registered: 30th Apr 2006
Posts: 12369
Loc: Birkenhead
Originally Posted By: scoop2004
ur car doesnt drive at idle mate,unless ur
reffering to slotting it into neutral and coasting? in which case
ur MPG guage shud read LOADS of miles per gallon,do u mean
"closed throttle"? (which is when ur foot is off the peddle and
the car is slowing down/revs are dropping?


Sorry, yeah I meant closed throttle when I get good mpg.

If I coast, mpg is still good, but as soon as I
slow down as to stop, the gauge goes back to only 15. I know it
seems more logical, infact it should read 0 instead of 15, but
it's never done this before and fuel consumption is being
affected

Thanks Stuy, I'll check the breather hoses tomorrow
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