Quote:
Originally Posted by reebis
The steps will clear everything the ECU has "learned" about it's environment and the corresponding tuning values (STFT, LTFT, etc). It will then re-learn based on the new altitude you're driving in now. Your tune should be fine as I believe it's loaded as a ROM into the ECU. Someone with more tuning experience would be able to verify, but my '01 RS that had a tune never lost it after resetting the ECU via this process.
How long have you been in CO?
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I've been in Colorado around 25 days. First week I driving without a Revision (Still tuned at Sea Level)... Then I got the revision on the second weekend.
It is a ROM file on the ECU. Fuel trims are now on the negative side than what they used to be. I'm just not so sure these events are tune-related.