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Well, this time I didn't have to wait too long. The high idle state was present during a half an hour trip yesterday. On the return trip, all was well again and remains like that today.
I'd say that that rules out oxidation as well. These contacts are made to resist that for quite some time as they are residing in stocks before being soldered. Then the completed units wait in stocks only to be installed maybe months down the line.
They're not like brake discs that show rust within half an hour of getting wet, they shoud resist oxidation for years and years and years. So cleaning them should result in a better lifetime than less than a day.
Every time the connectors have been off, the high idle state stays away for a while. It is almost as if it is the learning function of the ECU that tries to "correct" for something I don't know the cause of yet. But only some of the time. What's more, it doesn't seem to be a real time reaction to something, so it doesn't go away as soon as the cause goes away (like with the missing VSS signal, but that's been eliminated on my car as the high idle state can occur without any movement at all).
Curiously both the "wrong" -561 and the "right" -949 (for my engine that is) ECUs exhibit the exact same behaviour. So it must be something else.
I have decided to run the car "as is" for the time being. Basically in order to let the actual cause get worse, and preferably no longer intermittent. That way I should have something to trace.
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