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Thread: Idle Thoughts!!!

  1. #1
    Join Date
    Nov 2005
    Location
    Baltimore, MD
    Posts
    35

    Default Idle Thoughts!!!

    '90 525i (M20)
    Can someone please tell me at about what RPM should my car idle. It idles now at about 950...someone told me it should be around 1.5. I ask because I'm spending the weekend replacing my MAF...so your advice is appreciated.

    Thanks all

  2. #2
    Join Date
    Apr 2006
    Posts
    313

    Default

    1500 idle sounds extremely high and is most likely incorrect. My M5 idles at 850-900, although the motor in my car is different than yours.
    Last edited by VentoGT; 07-07-2006 at 03:08 PM.

  3. #3
    Join Date
    Mar 2005
    Location
    Hockinson, Washington
    Posts
    2,499

    Default

    Yea 1.5k sounds wrong...
    Lowered with blue h&r(?) springs, Bilsteins, tint, 19# design 3 injectors, Dual Magnaflow
    southwest WA

  4. #4
    Join Date
    Jan 2004
    Location
    Laplace, LA
    Posts
    74

    Default

    My 89 M20 idles between 750 and 800
    BMWCCA Member #330940
    Bayou Chapter, Louisiana

  5. #5
    Join Date
    Mar 2006
    Location
    CT
    Posts
    51

    Default

    Around 900 for me. When I do the display thing (where all the display lights go ), the car idles around 1100 upon start-up, but would go back to around 900 when the car was put into gear or shut off and turned on again.
    Last edited by Jzza4; 07-07-2006 at 04:47 PM.

  6. #6
    Join Date
    Mar 2006
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    811

    Default

    1500 is way to high. should be about 900. its controlled by the dme anyway, so its only a spec to see if you have some ther problem.

  7. #7
    Join Date
    Feb 2005
    Location
    Grand Marias USA
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    155

    Default

    I have an 89 that idles around 750

  8. #8
    Join Date
    Jan 2004
    Posts
    4,150

    Default Here's the specs for your idle speed, yours is the

    m20b25
    Last edited by Bill R.; 09-14-2007 at 11:22 PM.


  9. #9
    Join Date
    Mar 2006
    Location
    USA
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    1,839

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    my 530 idles at about 480 rpms when it warms up, but it is extremely responsive for off the line acceleration (massive tire squeal in .1s on an auto anyone?) so i dont plan on screwing with the idle settings.

    i suspect the DME drops the idle speed if it determines the engine has enough power, or raises it if the engine is getting weak.
    Alusil, Dinan DME | ITG Air Filter | Eibach/Bilstein HD | 26/20 Swaybars | Iridium plugs | Depo/ProLumen HID | Optima batt. | no AC | Stoptech brake lines, Frozen rotors, brass bushings, Superblue

  10. #10
    Join Date
    Jan 2004
    Location
    New Jersey
    Posts
    529

    Default

    Mine idles right around 700, give or take a few...

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