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Old Apr 25th, 2014, 02:33 PM
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DIY HELP!! 04 Cooper S very high fuel consumption on the next day

Hi guys,

I have an '04 Cooper S with an Alta performance upgrade. Absolutely in love with the car.
But the car started to eat a lot of gas, almost 20l/km with no sign.
- new spark plugs - factory
- new spark cables

lambda sensors checked - working perfect
air mass flow sensor checked - working fine

Any suggestions? carbon canister valve?

Also the car sometimes only starts on the 2nd ignition. But than it starts immediately. Does not matter if the engine is cold or hot.

Any suggestions on this?

Thanks and all tips, ideas are welcome
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Old Apr 25th, 2014, 03:47 PM
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Hi ya

When you say alta upgrade what do you mean supercharger pulley, airbox, exhaust.
There are a few things it could be

Does the car feel slow or down on power at all
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Old Apr 25th, 2014, 03:56 PM
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Hi,

what I know it got the supercharger upgarde and the airbox.

The car does not feel slow or down on power at all. It runs as before. Just the gas consumption in in credible. It was never an ECO car but now it is out of control.
What are your tips?
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Old Apr 25th, 2014, 04:09 PM
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Hi ya

1) Normally when they start to drink fuel it's the first 02 sensors they still work but there out of range which can cause high consumption. But you say it's been checked
2) If you have a reduced pulley check your tensoer make shore you have 1 hole showing if it's past that, you may have super charger belt slip will cause high fuel consumption.
3) Lazy bypass valve
4) my one gets cranky around 6 to 10 deg c I just reset the DME engine computer

If it has been serviced lately I would have a look at the belt,
do you know what size pulley is
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Old Apr 25th, 2014, 04:15 PM
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Unfortunately I have no clue about the size of the pulley. I tried to ask the previous owner but he does not know it either.
I will check does things.

How about the weird starting? Any ideas on that?

Thanks a lot
Miki
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Old Apr 25th, 2014, 04:29 PM
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Hi ya

Right for your information :-) you must have the correct supercharger belt for the pulley a standard mini belt is no good anyway I can help you there :-) alta only do a 15 or 17% pulleys for your SC, so as long as the crank and alternator pulleys are standard sizes you need a Gates K060535 or 6PK1364 this fits both size pulleys perfect like I said if you can't see the top of the last hole the belt is stretched and needs to be replaced

Starting problem could be a bad O2 sensor which would also point towards bad fuel consumption like I say normally bank 1 which is the first one from the cylinder head.
Also if you are running a standard manifold get the cat checked get a flow check carried out

Have you had your fuel pressure checked you may have a bad filter or a bad pump. The filters never get changed by mini and as a service item,

Hope this is a start :-)
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Old Apr 25th, 2014, 04:35 PM
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Thanks a lot. Let me check those.

Cheers,
Miki
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