Last month I did a 99K mi full clean+re-oil service of the K&N air filter. Since then I took a 3K mile cruise to sea level and back. All was fine, normal. Engine was running as well as ever; oil consumption still negligible.

Still is, but now that I'm back at 6K' above sea level, I find that the engine can be coaxed into an overboost condition, primarily if I'd used the throttle gradually to build boost and then much-less-gradually open it further. The ECU puts a halt to the situation (not-too-)abruptly, but I'm wondering why this is occurring now.

I adjusted the waste gate actuator rod years and years (and years) ago, and hadn't encountered overboost since then except for extreme situations (air denser+colder than I'm likely to encounter here; it's never happened in Summer before).

Time to reset the ECU (do I remember how to do that?) just for grins, or what?

Oh, I did just remember one other change: after I got back from the big cruise I did a slightly-belated (~7K mi) oil change and decided it was time to finally replace the slightly-weepy oil filler gasket. Could a much-better-sealing (brand new soft grippy rubber) oil-filler-hole gasket account for this somehow...?

TIA,

- Dave; '95 854T, 167K mi