AFR running extra rich at WOT?

[eTiMaGo]

Originally Posted by Teruyume

well ur pedal to the metal right, so throttle wide open, shouldn't the ECU sense a wide open throttle and asume u wants power, rich mixture more juice gives u more power. From my knowledge during wide-open throttle ECU will run with pre-set configurations ignoring couples like MAF and O2.

i can read some articles on EFIs
http://www.autoshop101.com/autoshop15.html

Yeah but the thing is, contrary to popular belief, a richer mixture does NOT give more power! The main use for an over-rich mixture is to provide a cooler burn of the air-fuel mix, to reduce the chance of knocking, most especially in a turbo application. It also causes a lot of fuel to be unburnt, which results in worse emissions and mileage.

In order to get the most power out of a normal air-fuel combustion, the ration needs to be stoichiometric (14.7:1) or very slightly lean.

Anyway I got some free time today, I'll try to reset my ECU, clean my MAF sensor and see if this helps. Also (doh), I just reread that thread about the TSB for the catalyser linked to the sulphur smell, I don't know if that is an option here but it may solve that part of the problem.