E30 Zone

iv had my m52 e30 on the diagnostics and its pulling a fuel trim limit code on bank 1 and 2

iv put my wide band on it and its 10.0-11.0 on idle
cruising is 14.5-14.5 and acceleration it holds around 12.8

its far to rich on idle but the rest is a bit rich but ok, it leans right out when i let off but i assume this is to do with the emissions.

it runs fine but will splutter now and then but it shows a crank fault for this and i can only get hold of an m50 sensor which is different i believe.

anyone shed some light on this please

I'd look at the stock lambda sensor first, I believe it has its greatest influence when the engine is at idle
The MAF and TPS should take over at mid to high rpm.
Once after doing an S50 swap I mixed up the front and rear lambda sensors,
it took a while to figure why one bank kept getting leaner and the other kept getting richer

Sean