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Thread: Temp Sensor

  1. #1
    Join Date
    Aug 2016
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    Mclean, VA
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    1992 850i, 2015 M5

    Temp Sensor

    While replacing some old air intake boots I found two different intake temperature sensors. One of them had the wires cut while the other seemed to be properly connected. I know the car was in a front end collison at some point and wondering if the cut one is from replacement intake box? Can anyone tell me 1) is there only disposed to be one temp sensor? 2) which is the correct one?
    Also, my OBC temp does work.
    Thanks.

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  2. #2
    Join Date
    Nov 2014
    Location
    Stockholm, Sweden
    Posts
    11
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    1992 BMW 850
    Quote Originally Posted by nrp22101 View Post
    While replacing some old air intake boots I found two different intake temperature sensors. One of them had the wires cut while the other seemed to be properly connected. I know the car was in a front end collison at some point and wondering if the cut one is from replacement intake box? Can anyone tell me 1) is there only disposed to be one temp sensor? 2) which is the correct one?
    Also, my OBC temp does work.
    Thanks.

    Sent from my SM-G950U using Tapatalk
    As I remember it should be 2, one for instrument cluster and one for dme's.

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  3. #3
    Join Date
    Nov 2014
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    Stockholm, Sweden
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    1992 BMW 850
    Quote Originally Posted by Captenkaos View Post
    As I remember it should be 2, one for instrument cluster and one for dme's.

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    I'm talking about 850, I don't know about 840.

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  4. #4
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    42,324
    My Cars
    11/88 E32 750iL+98 E36M3
    On the M70 of my E32 750
    air intake temp. sensors are inside the MAF , Nr. 1 shown here http://bmwe32.masscom.net/sean750/MA...leshooting.htm
    and 2 at the back of the intake as shown here, 1 each side http://bmwe32.masscom.net/sean750/sp...enumIntake.jpg

    then there are 3 coolant temp sensors on the back of the engine
    On my 750 M70 there are from right side to center
    ECT = engine coolant temperature sensor on M70 engine is at the right rear of engine in coolant cross pipe, 3-pins
    That goes to the both DME, brown/red wire and ground to DME 1, brown/red/yellow wire and ground to DME 2.
    Testing data are in the Bentley repair Manual page 130-35

    left one >>temperature gauge sender
    right one>> engine coolant temperature (ECT) sensor (DME)
    middle one>>>EML coolant temperature sensor

    Location: in coolant crosspipe at rear of engine under the coolant expansion tank.

    The open circuit supply to the sensor is at a 5.0 volt reference level and this voltage reduces to a value that depends upon the resistance of the CTS resistance. Normal operating temperature is usually from 80° to 100° C.
    The ECU uses the CTS signal as a main correction factor when calculating ignition timing and injection duration.
    EML introduction
    http://www.europeantransmissions.com...MW/EML-BMW.pdf
    Last edited by shogun; 02-11-2018 at 10:07 AM.
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  5. #5
    Join Date
    Jul 2009
    Location
    Del Mar, CA
    Posts
    707
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    91 850i, 01 740i, 06 760
    Only one on my 850. It has a yellow connector, located under driver side headlight assy and plugs into side of the air channel that cools the brakes.

  6. #6
    Join Date
    Nov 2014
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    Stockholm, Sweden
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    1992 BMW 850
    Quote Originally Posted by nrp22101 View Post
    While replacing some old air intake boots I found two different intake temperature sensors. One of them had the wires cut while the other seemed to be properly connected. I know the car was in a front end collison at some point and wondering if the cut one is from replacement intake box? Can anyone tell me 1) is there only disposed to be one temp sensor? 2) which is the correct one?
    Also, my OBC temp does work.
    Thanks.

    Sent from my SM-G950U using Tapatalk
    What year is your e31? M70 or M73?

    Skickat från min Nexus 5X via Tapatalk

  7. #7
    Join Date
    Aug 2016
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    Mclean, VA
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    1992 850i, 2015 M5
    Quote Originally Posted by Captenkaos View Post
    What year is your e31? M70 or M73?

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    92 850. M70


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  8. #8
    Join Date
    Aug 2016
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    Mclean, VA
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    1992 850i, 2015 M5
    Here are pics of the two sensors. The yellow one is the same one BMSman was describing. So what's the other one?

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  9. #9
    Join Date
    Nov 2014
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    Stockholm, Sweden
    Posts
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    My Cars
    1992 BMW 850
    Quote Originally Posted by nrp22101 View Post
    Here are pics of the two sensors. The yellow one is the same one BMSman was describing. So what's the other one?

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    Was it just hanging there? Where? I also have a 92. It looks familiar but I can't remember where I have seen it.

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  10. #10
    Join Date
    Jan 2012
    Location
    Upstate South Carolina
    Posts
    267
    My Cars
    1996 840Ci / 2007 B7
    See the answers in the post I made about the very same sensors a couple of days ago as to where they go: https://www.bimmerforums.com/forum/s...essure-sensors

  11. #11
    Join Date
    Dec 2007
    Location
    Dallas, TX
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    9,981
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    '93 850Ci- Daily Driver
    Quote Originally Posted by BMSman View Post
    Only one on my 850. It has a yellow connector, located under driver side headlight assy and plugs into side of the air channel that cools the brakes.
    There are 2 air temp sensors - 1 in each brake cooling duct. The one on the drivers side (left) is similar to the ones in the rear of each intake runner on the M70. The other one on the passenger side (right) is actually a "button". Both are mounted to the underside of each respective duct.
    '93 850Ci - Mineralweiss Metallic
    ALPINA B7 -Alpinweiss III

    BMWCCA E31 Chapter President



    ...the price of cool ain't cheap!

  12. #12
    Join Date
    Aug 2016
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    Mclean, VA
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    1992 850i, 2015 M5
    Quote Originally Posted by Captenkaos View Post
    Was it just hanging there? Where? I also have a 92. It looks familiar but I can't remember where I have seen it.

    Skickat från min Nexus 5X via Tapatalk
    It was properly seated on the underside of the passenger side duct but wires were cut. Not sure where it's supposed to connect to?

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