Welcome to ZRoadster.org - BMW Z1 Z4 Z8 Z3 Forum and Technical Database

If you want to join in with the discussion, and see the areas which are available only to members then sign up now!

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

strange temp gauge?

Discussion in 'Z3 Roadster & Coupé' started by robertjones, Sep 17, 2014.

  1. robertjones

    robertjones Regular Member

    Joined:
    Sep 13, 2014
    Messages:
    48
    Likes Received:
    10
    Trophy Points:
    18
    Noticed on my z, the temp gauge moves up to the halfway mark after maybe, half a mile of setting off from home , even though the engine hasnt warmed up, it then stays there however fari travel, uses no water and fan kicks in o.k. , doesnt seem to overheat Is this normal ? As my last z would run for quite a while until the engine warmed up before moving to normal, engine is 1.9i
     
  2. Brian H

    Brian H Zorg Guru (V)
    British Zeds Scottish Zeds

    Joined:
    Dec 5, 2011
    Messages:
    3,555
    Likes Received:
    2,580
    Trophy Points:
    195
    Location:
    Killin
    Model of Z:
    E36/7 3.0i - E85 Z4///M
    Robert,

    If it aint broke don't fix it :), the temp gauge is a buffered gauge so when the needle sits in the middle it will cover a range of 20 or so degrees.

    Brian
     
    • Agree Agree x 2
  3. robertjones

    robertjones Regular Member

    Joined:
    Sep 13, 2014
    Messages:
    48
    Likes Received:
    10
    Trophy Points:
    18
    Agree with u but just think its unusual and wondered if anyone elses z was the same , as I have never had a gauge that worked llke that before as soon as I leave the house the temp starts showing a reading
     
  4. GazHyde

    GazHyde The Gaz Monkey
    Staff Member Administrator Global Moderator British Zeds

    Joined:
    Dec 2, 2011
    Messages:
    15,251
    Likes Received:
    9,504
    Trophy Points:
    226
    Location:
    Newbury, Berkshire
    Model of Z:
    BMW Z4 3.0Si Sport
    Doesn't take very long to get to the middle on my 2.2.
     
    • Agree Agree x 1
  5. Brian4

    Brian4 Zorg Guru (IV)
    British Zeds East Anglian Crew

    Joined:
    Dec 23, 2011
    Messages:
    2,589
    Likes Received:
    2,063
    Trophy Points:
    173
    Location:
    Hinckley/Burbage
    Model of Z:
    Z3 3.0i Auto
    Same in ours gauge quickly to mid point and heater blows warm air about 5 mins later.
     
    • Agree Agree x 1
  6. robertjones

    robertjones Regular Member

    Joined:
    Sep 13, 2014
    Messages:
    48
    Likes Received:
    10
    Trophy Points:
    18
    Sounds as if its the norm. For some of these cars then, unless yours is unusual as well!
     
  7. oldcarman

    oldcarman Zorg Guru (V)
    Supporter Canadian Zeds The M44 Massive

    Joined:
    Feb 11, 2014
    Messages:
    9,991
    Likes Received:
    3,617
    Trophy Points:
    177
    Location:
    Pine Falls Manitoba can.
    Model of Z:
    1.9 M44
    Anyone had intermittent temp gauge problem? Works normally or not at all? JIM
     
  8. hard top

    hard top Zorg Expert (I)
    Dutch Zeds The M44 Massive

    Joined:
    Dec 5, 2011
    Messages:
    20,780
    Likes Received:
    6,065
    Trophy Points:
    213
    Location:
    Netherlands
    Problems in the bedroom department Jim?.......;)
     
    • Funny Funny x 1
  9. t-tony

    t-tony Zorg Expert (I)
    Supporter British Zeds #ZedShed

    Joined:
    Dec 31, 2013
    Messages:
    33,101
    Likes Received:
    15,592
    Trophy Points:
    220
    Location:
    Torksey Lock,Lincoln, England
    Model of Z:
    Z4 3.0 Auto
    Mine does the same as Gaz and Brian's cars. I've had it over 4years now and it's never been any different.
    As Brian H said and I agree.

    Tony.
     
  10. Brian4

    Brian4 Zorg Guru (IV)
    British Zeds East Anglian Crew

    Joined:
    Dec 23, 2011
    Messages:
    2,589
    Likes Received:
    2,063
    Trophy Points:
    173
    Location:
    Hinckley/Burbage
    Model of Z:
    Z3 3.0i Auto
    Just looking on the wiring diagram for the Z3 and the coolant temp sensor for the gauge is at the rear of the cylinder head under the inlet manifold so it will get to see any heat pretty quickly perhaps that is why is rises fast initially. It also feeds through the DME control unit and this gives the analogue output to the temp gauge. Electronic wizardry so the likes of most of us cannot understand.
    Gone are the days when one sensor is connected directly to the display for that item.

    The speedo isn't driven by the gearbox but by the wheel speed sensors used by the ABS and AST or DSC and a sensor in the rear axle.
     
  11. zedonist

    zedonist Guest

    I've found mine does not work when i switch the engine off, it works again when i switch it on, must be an intermittent design fault.:woot:
     
    • Funny Funny x 3
  12. t-tony

    t-tony Zorg Expert (I)
    Supporter British Zeds #ZedShed

    Joined:
    Dec 31, 2013
    Messages:
    33,101
    Likes Received:
    15,592
    Trophy Points:
    220
    Location:
    Torksey Lock,Lincoln, England
    Model of Z:
    Z4 3.0 Auto
    Speedo cables are long gone Brian, except if the elastic has gone in them.:ymdevil:=))=))
     
    • Funny Funny x 1
  13. robertjones

    robertjones Regular Member

    Joined:
    Sep 13, 2014
    Messages:
    48
    Likes Received:
    10
    Trophy Points:
    18
    Blimey, no wonder it goes up so quickly!
     
  14. Brian4

    Brian4 Zorg Guru (IV)
    British Zeds East Anglian Crew

    Joined:
    Dec 23, 2011
    Messages:
    2,589
    Likes Received:
    2,063
    Trophy Points:
    173
    Location:
    Hinckley/Burbage
    Model of Z:
    Z3 3.0i Auto
    Point I was trying to make Tony.
     
  15. zedonist

    zedonist Guest

    Just a clarification the speedo is controlled by a fan disc and sensor in the differential only, the wheels spin at different speeds at different times during driving so would not be much use to the speedo.
     
  16. jonco

    jonco Zorg Guru (III)
    Supporter British Zeds The M44 Massive

    Joined:
    Dec 6, 2011
    Messages:
    1,361
    Likes Received:
    676
    Trophy Points:
    149
    Location:
    Chester
    Model of Z:
    '98 1.9 Auto
    Agreed - if you have access to INPA - engine module you can see the temp readout varying by ~10 degrees as stat controls even though instrument cluster temp guage remains steady. Maybe stat was faulty on previous Zed hence slow warm-up.
     
  17. oldcarman

    oldcarman Zorg Guru (V)
    Supporter Canadian Zeds The M44 Massive

    Joined:
    Feb 11, 2014
    Messages:
    9,991
    Likes Received:
    3,617
    Trophy Points:
    177
    Location:
    Pine Falls Manitoba can.
    Model of Z:
    1.9 M44
    Nothing a couple of tongue depressors and elastic bands can't overcome. It's the slivers that are the problem but I think if I use sandwich wrap first should be a go!! What are you using?
     
  18. oldcarman

    oldcarman Zorg Guru (V)
    Supporter Canadian Zeds The M44 Massive

    Joined:
    Feb 11, 2014
    Messages:
    9,991
    Likes Received:
    3,617
    Trophy Points:
    177
    Location:
    Pine Falls Manitoba can.
    Model of Z:
    1.9 M44
    Thanks, I didn't get any owner manuals with the car. I'll see if that works now that you've cleared that up. JIM
     
  19. zedonist

    zedonist Guest

    It's still intermittent Jim, as I say, but I will sort it out soon.......let you know the solution in another three years......
     
    • Funny Funny x 1
  20. vintage42

    vintage42 Dedicated Member
    American Zeds

    Joined:
    Dec 24, 2013
    Messages:
    227
    Likes Received:
    66
    Trophy Points:
    39
    More than that. The needle reaches vertical resting point at 155F and stays there until 205F, the highest I have seen my 1.9's temperature go on the ScanGauge sitting in traffic on a hot day.
    http://i49.photobucket.com/albums/f280/vintagefortytwo/BMW Z3 Related/ScanGauge/ScanGaugeOn_zps0ee4d6bf.jpg
    My (one electric) fan turns on shortly after 200F, so I have never seen at what temperature the needle might go past the vertical toward the red.
    The needle stays vertical throughout a wide operating temperature range, even as the ScanGauge shows the actual temperature varying constantly with driving conditions.
     
    #20 vintage42, Sep 18, 2014
    Last edited: Sep 18, 2014