Fuel Consumption increased after service

snerkler

snerkler

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I had my 6000/annual service done on my DOHC GSA a few weeks ago and since then my MPG has been consistantly down 5-7mpg on every tank, both according to the computer and manual calculations. I'm using the same fuel, doing the same riding (same routes, no more aggressive with the right hand), and have rode in a variety of different ambient temperatures. Is there a logical explanation for the drop in MPG?
 
Was there a software update to the ECU at the service and how many MPG are you getting now....?
 
I wonder if BMW will offer compensation for the extra money you are spending :nenau
 
Popell said:
Where did you have it serviced?, have you spoken to them about it?
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No, I thought I'd ask on here first before making a fool of myself at the dealer if it's something obvious/to be expected. I've made a fool of myself many times on here already so another once won't make a difference :P
 
if you were getting 50 plus you must drive like a nun,mine shows constantly 48:D
 
Well if you are sure of your figures and they are based on several tanks worth of readings, then I reckon you need to find the answer.

I can't think of anything immediately that would change - if done correctly - in a service that would cause this reduction. Unless as someone else mentioned, software upgrade that has richened the mixture to stop the valve heads popping off due to lean mixture.
Check your tyre pressures, if they are soft and you had them well up before then this could explain some of the reduction.

Not sure if there would be a connector that if left off may cause this, perhaps Steptoe would give a heads-up on this one?

Let us know what you find
 
autogs said:
if you were getting 50 plus you must drive like a nun,mine shows constantly 48:D
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I'm no nutter no, but have the odd spirited ride. That being said I'm quite often in the 6-8k rev range, which I know some on here never dream of ;)
I don't think 48's bad at all, and am happy with that. It's just before I couldn't get it to go below 50 no matter how hard I tried, and generally was 53-55, so find it a little odd. Not the end of the world I know, more curious than anything.
 
Popell said:
Well if you are sure of your figures and they are based on several tanks worth of readings, then I reckon you need to find the answer.

I can't think of anything immediately that would change - if done correctly - in a service that would cause this reduction. Unless as someone else mentioned, software upgrade that has richened the mixture to stop the valve heads popping off due to lean mixture.
Check your tyre pressures, if they are soft and you had them well up before then this could explain some of the reduction.

Not sure if there would be a connector that if left off may cause this, perhaps Steptoe would give a heads-up on this one?

Let us know what you find
Click to expand...
Will do. Tyre pressures were the same. I've just had some new boots fitted (standard tourance rather than EXP's) this week though so will be interesting to see if this makes any difference. :nenau
 
actually:blast just remembered i have one of them accelerator module things,
so that would richen things up a bit,mind you it does smooth things out nicely so i will gladly trade off a couple of mpg.
 
If the invoice says cam timing has been checked /adjusted I would mention it to the dealer. it seems quite easy to mess this up and my bike had to be re adjusted correctly again at 7500 after I was unhappy with engine after the 6000 miles service. i regularly get 55 mpg, ride it reasoanbly hard but do very little town work.
 
These bikes have an 'intelligent ECU' which in theory learns your riding characteristics i.e. acceleration, speed, revs etc and adjusts the engine accordingly. If the dealership has downloaded fresh software for your ecu (as they invariably do) 'your' setting will be lost and you'll have to teach the ECU again. No I'm not making it up either.

It's the same with modern automatic gearboxes in cars ...............
 
Tunneruk said:
These bikes have an 'intelligent ECU' which in theory learns your riding characteristics i.e. acceleration, speed, revs etc and adjusts the engine accordingly. If the dealership has downloaded fresh software for your ecu (as they invariably do) 'your' setting will be lost and you'll have to teach the ECU again. No I'm not making it up either.

It's the same with modern automatic gearboxes in cars ...............
Click to expand...

So it should gradually improve again?
 
davnjud said:
If the invoice says cam timing has been checked /adjusted I would mention it to the dealer. it seems quite easy to mess this up and my bike had to be re adjusted correctly again at 7500 after I was unhappy with engine after the 6000 miles service. i regularly get 55 mpg, ride it reasoanbly hard but do very little town work.
Click to expand...

tbh,i doubt very much if the cam timing was adjusted,once timed on the initial build this does not alter unless there has been a problem needing a top end strip.
 
There have been quite a few that have been out on the left side so that blows that theory out of the water!
 
Tunneruk said:
These bikes have an 'intelligent ECU' which in theory learns your riding characteristics i.e. acceleration, speed, revs etc and adjusts the engine accordingly.
Click to expand...

Really?

How does that work for the stock 3D fuel/ignition map burned on an Eprom within the ECU then??

I didn't know the 1200 series ECU ran fuzzy logic ??? :confused::confused:
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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