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Thread: Temp gauge..odd showings..

  1. #1
    Join Date
    Aug 2006
    Location
    Denmark
    Posts
    37

    Default Temp gauge..odd showings..

    Hello all

    My first post here... great forum by the way.

    My temp gauge is showing some odd readings. When i start my car (from cold engine) the temp needle jumps straight way to 12 o'clock and works its way to 2 o'clock as engine getting warmer.

    When i disconnect the coolant temp sensor it shows Zero. Then laying the sensor at a hot spot on the engine it straight away jumps tp 2 o'clock again.

    Im i dealing with a faulty coolant temp sensor here ? Its getting pretty funny to drive without knowning how hot your engine is.

    Anyone else seen that kind og error before?

    my car is the bmw e34, 2,5 - 1988

    Regards

    /Anders

  2. #2
    Join Date
    Jan 2004
    Location
    Boston & Attleboro MA
    Posts
    727

    Default

    Possible instrument cluster issue, find out if your SI board has batteries that tend to fail after 15+ years.

    http://www.programainc.com/files/03_...t_Clusters.pdf
    Current
    2008 M5 6 Spd
    2000 Z3 2.8 5 Spd MSport
    2012 X5 35d Sport
    1995 540i 6 Spd
    1992 535i 5 Spd

    Former
    1995 530iA
    1986 635CSI 5 Spd
    2011 X3 2.8 MSport

  3. #3
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default

    possible yes, I would replace the sensor first.
    order parts from www.bmaparts.com


    Quote Originally Posted by DaCan23
    Possible instrument cluster issue, find out if your SI board has batteries that tend to fail after 15+ years.

    http://www.programainc.com/files/03_...t_Clusters.pdf
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4
    Join Date
    May 2004
    Location
    Japan
    Posts
    9,249

    Default

    Quote Originally Posted by DaCan23
    Possible instrument cluster issue, find out if your SI board has batteries that tend to fail after 15+ years.

    http://www.programainc.com/files/03_...t_Clusters.pdf
    E34 do not have SI batteries anymore like the older models E30 and E28.
    They have capacitors.
    But capacitors also fail after 15 years or earlier
    http://bmwe32.masscom.net/johan/dash...dash_caps.html

  5. #5
    Join Date
    Aug 2006
    Location
    Denmark
    Posts
    37

    Default

    might have to say the problem was showing after i replaced my top during overheating... i gotta new top and also replaced the rest above the top...

    The rest og my gauges works fine..

  6. #6
    Join Date
    Oct 2004
    Location
    Honolulu
    Posts
    3,105

    Default The M20 has two sensors

    on the water neck.

    Could they be mixed up?


    Vee ave vays of dealing vid your kind...........

  7. #7
    Join Date
    Aug 2006
    Location
    Denmark
    Posts
    37

    Default

    No the cylinder head gasket was replaced because the old one blowed... then i also got a new air intake manifold, tstat housing and so on,,, engine parts where taking from en e30 m20 2,5 1988. So got all new gear from a e30 engine from the head gasket and above

  8. #8
    Join Date
    Aug 2006
    Location
    Denmark
    Posts
    37

    Default

    Blitzkrieg Bob:

    I will look that up.. and try to look for them to possible be switched

    and because af the gague failure i also constantly getting messages that engine is overheating... very very irretating

  9. #9
    Join Date
    Oct 2004
    Location
    Honolulu
    Posts
    3,105

    Default There was a member here last year

    who went through something like this and after all the work, it turned out to be mixed up high temp and low temp sensor on the water neck T stat housing.

    Good luck


    Vee ave vays of dealing vid your kind...........

  10. #10
    Join Date
    Aug 2006
    Location
    Denmark
    Posts
    37

    Default

    Blitzkrieg Bob:

    Can u tell the line up by color... i know one og them are blue and i think one og them are brown.. is it the two most outer sensors we are talking about?

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