Originally Posted by
donf
The wideband info can help on both. We are on this side of the computer screen, so its very hard to diagnose a problem. You have to start with what you know and your flying blind on a lot of this without logging wideband readings. If it starts acting weird you can log that and know for sure its not or it is fuel related. With a narrow band you may know its rich or lean, but they are basically Stoic sensors and nothing more accurate than that. If you are looking at the block learn averages to change to spot something like this, it may if it happens for long enough, but its not the best way. If you positively cant afford a wide band I would look at the logged data in spreadsheet form anyway without it. See what it changing frame by frame over that particular problem. Whether its IAC counts, or timing, or the very limited fuel mixture info you already have access to. Post the info in spreadsheet form for the few seconds when the problem is happening and maybe others can take a look too.
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