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Thread: M50 Engine rpm control with air-cond compressor ON

  1. #1
    Join Date
    Feb 2005
    Location
    Penang, Malaysia
    Posts
    243

    Default M50 Engine rpm control with air-cond compressor ON

    folks, i drive a non-vanos m50 e34 with air-cond in tropical malaysia. it is a manual car.

    here's my problem:
    1. with air-cond switch OFF, the engine rpm control is very smooth across the range including idle and drops quickly nicely when i take the foot off the accelerator.

    2. with air-cond switched ON, the engine rpm takes a while (~0.5 - ~1s) to drop once i take my foot off the accelerator. also idle speed takes a while to settle down and sometimes swings to 1000rpm.

    my question is:
    1. how does the ecu controls rpm speed (idle etc) when the air-cond is ON?
    2. what sensors/vacuum pipes etc are related to engine rpm control when air-cond compressor is ON?

  2. #2
    Join Date
    Feb 2005
    Location
    Penang, Malaysia
    Posts
    243

    Default

    does anyone knows what i'm asking or talking here

    Quote Originally Posted by ktteoh
    folks, i drive a non-vanos m50 e34 with air-cond in tropical malaysia. it is a manual car.

    here's my problem:
    1. with air-cond switch OFF, the engine rpm control is very smooth across the range including idle and drops quickly nicely when i take the foot off the accelerator.

    2. with air-cond switched ON, the engine rpm takes a while (~0.5 - ~1s) to drop once i take my foot off the accelerator. also idle speed takes a while to settle down and sometimes swings to 1000rpm.

    my question is:
    1. how does the ecu controls rpm speed (idle etc) when the air-cond is ON?
    2. what sensors/vacuum pipes etc are related to engine rpm control when air-cond compressor is ON?

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