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Joined: Apr 2006
Posts: 12,369 Likes: 1
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Joined: Apr 2006
Posts: 12,369 Likes: 1 |
Only recently, in the past week or so, I've been getting really crap MPG. 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 . Any ideas whats causing this? Faulty MAF perhaps? Worn cams aswell?
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Joined: Sep 2004
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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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Joined: Apr 2006
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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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Joined: Nov 2004
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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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Joined: Nov 2003
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The MPG gauge on the BMWs work of the vacume on the inlet system - check all the breather hoses are clear.
What If There Were No Hypothetical Questions?
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Joined: Apr 2006
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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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