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Thread: Idle RPM for M62TU

  1. #1
    Join Date
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    M6 Turbo,E30 M3,540iT

    Idle RPM for M62TU

    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?

  2. #2
    JimLev's Avatar
    JimLev is offline Artifically Aspirated Moderator
    Join Date
    Oct 2006
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    Sundance Mesa, NM
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    00 540/6, '16 Highlander
    A 540tu should idle about 550RPM.
    The non tu is a bit higher.

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