Running really rich

[metalguru]

OBD2 cable does'nt like tuneboy.
Need Tuneboy cable AAARRRGG!!
Spot on BB the baro pipe can give that problem (been there) or plug into Tune ECU see what sensors are reading.

[NKL]

My baro pipe was disconected at the ECU for ages (from when I bought it) until I noticed, connected it and noticed no difference whats so ever.

[Bixxer Bob]

Over the last 10 yrs, the baro range for the UK has been roughly 90mb around a mean pressure of about 1010mb.

That equates to less than 10% variation.  Add in effects of a blocked air filter vs a clean one and you'll hit about 10%

10% more oxygen means 1.4%  more fuel so over a tankful slightly more than 1/2 a mile per gallon variation ie instead of 45 mpg which is roughly what I get, it's be 44.37 mpg.  You won't notice that.... but it means a lot to your engine.  But where it really comes into it's own is overseas where pressure varys greatly with altitude.  No need for re-jetting!!

With the baro disconnected, you might just notice, on a cold damp day, that it runs a bit smoother and pulls a bit harder. That''s the extra oxygen and moisture in the air giving it a boost.

[NKL]

Yes, I've connected it for my trip over the alps this year