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Thread: Temp sensor values for this picture

  1. #1
    Join Date
    Jan 2012
    Location
    Vancouver, BC Canada
    Posts
    94
    My Cars
    1985 Mercedes 300SD

    Temp sensor values for this picture

    Hey all, I'm working on chasing down my rough idle on my 733i and I found this great picture of all the temp sensors and what they're for. I was hoping that someone here could fill me in as to what they should read if they are still good. Could anyone provide that info so I can check them all?

    thanks folks

    E23engine-temp sensor.jpg
    1983 BMW 733i My current project (or at least one of them)
    2003 Volvo V70 5 Speed Current Daily Driver
    1993 300TE 4Matic Project wagon -sold
    1997 E290 Turbo Diesel Wagon -traded for above, an amazingly comfortable car to drive, great drivetrain, but the rust, oh my god the rust

    1992 BMW 525i -traded in
    1990 Silver 300TE -Sold Loved the wagon, hated the M103
    1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
    1979 Silver 300D "The Silver Slug" -Sold

  2. #2
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i

    Thumbs up

    Well...it depends! On coolant temp.

    Temp sensor with two prongs just runs to gauge cluster. The one to the Motronic is an NTC, I would assume the others follow suit. Make sure now hacker put in a resistor in the harness. The thermotime is for cold starts only. Not familiar enough with the other that is for idle control unit, sorry.
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



  3. #3
    Join Date
    May 2013
    Location
    Killingworth, CT
    Posts
    562
    My Cars
    '84 733i, 01 X5 00 750iL
    I have an excellent running 1984 733 that idles well. I can check these tomorrow at ambient temp if you want
    Steve H.

  4. #4
    Join Date
    Mar 2007
    Location
    Quadratechtown, PA
    Posts
    741
    My Cars
    5, 7, 4x4
    Most of that information is in the Bentley E28 5-series manual. A valuable addition to the repair documentation for the E23.

  5. #5
    Join Date
    Jan 2012
    Location
    Vancouver, BC Canada
    Posts
    94
    My Cars
    1985 Mercedes 300SD
    @bobdospecial
    I'd appreciate that, thanks.

    @8991xj
    I know, I've been trying to avoid a lot of further investment until I see if I can get it to run better.

  6. #6
    Join Date
    Mar 2007
    Location
    Quadratechtown, PA
    Posts
    741
    My Cars
    5, 7, 4x4
    Maybe a search of mye28.com will reveal the numbers for you. I'm sure they have been posted in a few threads, maybe more than one sensor per thread but searching to find them might be a bit difficult. But give it a try as we await the answers.

  7. #7
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i

    Thumbs up

    Pester me and I will dig out my Bentley book for you. Main CTS to the ECU starts high, like in the 1000s and drops to the 100 area hot.
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



  8. #8
    Join Date
    Mar 2013
    Location
    USA
    Posts
    465
    My Cars
    E21/early e23/e34
    This is want you want- same as my '79- Your's may be the shorter sensor (bottom protruding into housing) but this will work.

    https://www.ebay.com/itm/BMW-E23-E24...Yk~:rk:20:pf:0
    Last edited by kojo96; 10-22-2018 at 03:02 PM.

  9. #9
    Join Date
    Dec 2019
    Location
    Ontario
    Posts
    3
    My Cars
    733i
    Hey.. Did you ever get any resistance info on the coolant temp for idle sensor? The manual I have is useless for this.

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