My stage 2 SC has recently started running even richer than its Courtenay map intended. I have a wide band AFR and it seems to be showing some odd behaviour with the fuelling:
AFR 13.2 in cruise at constant 70mph. Used to sit at 14.7
AFR 11.0 at WOT
AFR 14.7 at idle
About 50% of the time, AFR drops to max lean 22.0 indicated on the overrun. The rest of the time it goes rich - around 13.2.
It looks as though one of the sensors is throwing a wobbly, but the EML is not lit, so the ECU seems to think that all is OK. I'm guessing Lambda or MAP. Any ideas before I throw money at new bits?