Originally posted by Austrianvespaguy
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Trouble with new Megasquirt (fuel or wideband most likely problem child)
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Originally posted by Austrianvespaguy View PostOk, here's my first observations/suggestions. I think you ARE indeed going lean. AFR starts creeping up just as soon as afterstart enrichment goes away, and your VE is in the low 30s, which I certainly don't consider 'high' for an M20:
Next, DISABLE closed-loop idle and EGO feedback. At least for now/while tuning, you want as few variables as possible to simplify things first. Add the fancy features back in for FINE tuning once you get this close on open-loop.
Thirdly, you can't *really* run pure Alpha-N with an idle valve. As the idle valve moves, engine load changes, but since the ECU doesn't 'see' the TPS load change, it keeps fuel the same. You can see this as the abrupt drop in AFR right when you idle valve closes down some, while PW stays constant @ 4.4ms. You can sorta fudge around this by carefully compensating warmup enrichment against your idle valve position, but the 'right' way to do it is to change from Alpha-N to ITB mode.
ITB mode uses a 'blend' of TPS and MAP signals for load, but it involves a bit of work to set up the ITB Load Settings curves and redoing your VE table accordingly. Will give you the best result in the end though, so I'd recommend it.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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