Fuel mixture?

[Gregg83]

Is it possible to adjust the fuel mixture on the MAF for the m50 engine? Just had my mot today and the CO% was 0.671, which seems very lean to me? Or is that about average for the m50...?

[Brianmoooore]

Spec. is 0.7, so looks close enough to me! In any case, if this kind of thing is out, it indicates a fault somewhere which needs sorting, not introducing another fault (moving factory adjustments) to compensate.

[Gregg83]

That sounds close enough to me! I was brought up on minis and mk1 golfs mainly so adjusting the mixture has been the norm, but the maf is a sealed unit so you're probably right that I shouldn't start playing about with it.
Thanks Brian!