I attest this to open loop vs. closed loop. Or as you suggest losing ground because of heat.
I need to test vacuum hotter maybe.
I have redone grounds a couple of times (while waiting for Jack to actually explain why my grounds were so wrong. No explanation until I got hostile) while being belittled for not knowing even asking for multiple days.
I'm wrong about open loop to closed loop, today I got on it cold to misfire again. Could be O2, but they don't play until warm (closed loop) I think.
I'll replace the O2's as they seem to be failing. I still haven't had a chance to test or log Knock, maybe the sensor is working and I actually am pinging.
Happy to have an intelligent conversation about this.
Catahula, Jack will tell us to our faces he can be and ass, unfortunately a very intelligent ASS, which sometimes hurts just deal with it.
I got to thinking about my comment after and thought the loss of OHM was maybe just on the heater side which in most cases only effects the warm up time for emissions. That said if that circuit is corrupted it is possible the rest of the lomb is. But, seeing it on both side 1/2 still possible but less likely. Question if what you stated is true why is it going in and out of loop, as after warm should lock on and stay there. That is on VW VAG, out of my pay grade, again could be best answered by the resident ASS.
Open loop always runs chubbier than closed so might not start to misfire until it gets leaner.
Went back over some of this right from the beginning. I noted misfire in all 6 holes, so probably would not have replaced all 6 coiles as not likely lightening to strike in 6 places, but your call, and certainly could illusd to Jacks assertions of a power and ground issue. Missfire is fuel, compression or lack of plasma, any of the 3, or all 3.
Then reading some of this initially was a boost issue which you stated you fixed or thought you did. This is not argumentative but out of experience. We had a dodge Sprinter which would only fail after hot, sound familiar. Being diesel would code, limp mode then once shutting key off would start right up and run good or not. In the end even though testing with pressure as you stated, was found to be a cracked inter-cooler (aluminum) which would only open under higher boost and heat, sound familiar. Was eventually found but struggled to do it. Being aluminum would scrubb off the heat quickly then would hold until higher boost and more heat, was a real mother too find. This would not manifest itself till higher temps, and about 15/20 lbs boost, lower than temps or pressure worked fine.
I don't propose to understand all of the Vag strategy, but know in most systems fueling will be accommodated by boost, and if boost is low, fueling might for load and RPM also be too lean using a matrix from boost and RPM, and other factors. Again I'm speaking out of turn here as don't know the protocol like Jack or UWE, and others. But the answer is in the logs as that is some sweet data not available in most scanners.
stated (I need to test vacuum hotter maybe.) As jack stated might electrical, my guess more than one issue, usually is.
Good Luck