Min has a little sort of hiccup type misfire at idle, seems to be resolved somewhat by raising the idle. At least not as bad at 700 rpm as it is at 600.
I used to have that. I sat in my driveway for about an hour forcing the IACV to different RPMs that ran the smoothest, then I adjusted spark advance for maximum vaccuum. Then RPM again, then timing. I adjusted my tables to match that. I also played with the commanded AFR when in open loop at low temps. Engine idles a helluvah lot smoother than it did before I did all that.
It's worth the effort.
I dunno, i never read that and you're the first to mention it.
If that's true about the 0411 i will put the black box back in. I have 0 experience tuning and i don't need the added headache of a swapped ecu not quite right especially when trouble shooting.
I would most-definitely move the dizzy then a little retarded and try to get your hot offset to be +/- across 0*, just to be absolutely sure (or do it after you install a new unit, should you do that). You don't have the ability to re-learn the crank offset though do you, you have to go to a shop. Right?
As far as logging your misfires, did you tell dash command that you're now in a 01 chevy van and all that so it sought out the correct PID addresses? You may be telling it that you're still in a '98, so it's telling the ECU it wants shrimp cocktail and the ECU is blowing a kazoo.
Just having PCM scanner software from HP tuners would make this all WAAYYYYY easier.. Even a datalog from dash command.
Also, are you going to try my suggestion with the plug gap on those two cylinders? I think the timing light on each cylinder would be a good idea, just to see it.
, I think whenever he finds the solution he should post something in that thread. This thread is already 50 pages long, we've got a lot of people posting, and I'm sure I'm not the only one having a hard time keeping up with what he's done, checked, noticed, and what people have already suggested.