My idle is too low without the A/C on - 450 vs 600 (auto trans.). The alternator will output nominal voltage (12.8V@450 vs 14.10V w/A/C engaged). Yes I have checked vacuum and recently refreshed top end. What should it be? I recently drove another E39 and its' rpm was closer to 800. Is more better. I plan on going into the software and upping it. Yes? No?
A 540tu should idle about 550RPM.
The non tu is a bit higher.
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