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Coolant temp sensor

Posted by 98bluegsx, Mar 7, 2020

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  1. 98bluegsx

    98bluegsx Proven Member

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    Joined Feb 24, 2018
    Kutztown, Pennsylvania
    Hey have a question. I have a car that I have that will not start after a new build. Starts but shuts off. I aaa curious on if the coolant temp sensor will do this or if any other sensors will besides cps and cas. The car has no coolant in it which is why I ask. Any help or information is greatly appreciated!
     

    Street Build 557  8

    1998 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. 609DSM

    609DSM Proven Member

    365
    146
    Joined Aug 13, 2019
    Langhorne, Pennsylvania
    Not very familiar with the 4g63 platform but from my experience with the 420a engine if your coolant temp sensor is disconnected or faulty you will experience a hard time starting or rough starting.

    I would assume it is similar with the 4g63, as a safety if it doesnt sense a connection it wont let the driver start the car because it can quickly overheat with no coolant. Just my .02
     

    Street Build 263  2

    1995 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    Street Build 408  1

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM
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  3. Vegas Smith

    Vegas Smith Proven Member

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    Houston, Texas
    A bad cts could make the car hard to start and run.
     

    Street Build 4K  3

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  4. 98bluegsx

    98bluegsx Proven Member

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    Joined Feb 24, 2018
    Kutztown, Pennsylvania
    Okay sweet thanks did the info. Does it need to sense the coolant for it to run or will it be able to sense air temperature?
     

    Street Build 557  8

    1998 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  5. Lucky13

    Lucky13 Supporting Member

    143
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    Joined Nov 20, 2002
    Palm Beach Gard, Florida
    When I was fighting frayed wiring to my coolant temp sensor it would read something like -130 in Link and would not stay running.
     
  6. Vegas Smith

    Vegas Smith Proven Member

    3,948
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    Houston, Texas
    Hmm, I don't know the answer but I doubt it's helping. Do you have ecmlink by chance? When your cts goes bad, it reads a really low temperature as mentioned above^ and makes you run incredibly rich.
     

    Street Build 4K  3

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  7. 98bluegsx

    98bluegsx Proven Member

    58
    4
    Joined Feb 24, 2018
    Kutztown, Pennsylvania
    No I have the black box ecu I wish I had link
     

    Street Build 557  8

    1998 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  8. steve

    steve DSM Wiseman

    13,544
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    Joined Feb 3, 2002
    Boulder, Colorado
    On a cold engine it senses ambient but that's what the the housing, air and coolant are at. I assume that in free air it would still measure ambient but the quick answer is log yours and see what it's reading.
     

    167  4

    2008 Audi TT 3.2 Quattro Roadster
    awd · manual · Misc Vehicles

    138  5

    2002 Audi TT Quattro Roadster 225
    awd · manual · Misc Vehicles

    148  2

    1992 Dodge Stealth RT/TT
    awd · manual · 3000GT/Stealth

    4K  12

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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  9. 93xsg

    93xsg Proven Member

    157
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    Joined Jul 3, 2011
    Sequim, Washington
    My 1g wouldn't start one time because the coolant temp sensor had popped off.

    OHM Racing sells the replacement plug with wire pigtail. I got from their ebay store for fast shipping along with a few other damaged connectors.
     

    Drag Race Build 607  15

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  10. jpmxrider489

    jpmxrider489 Supporting VIP

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    Joined Apr 4, 2010
    pittsburgh, Pennsylvania
    Is there a reason that there is no coolant in the care. With my sensor disconnected I read -74. But yes it could cause it not to start and run. Your Tps sensor could also make it hard if its unplug.
     

    Street Build 253  1

    1995 Eagle Talon TSi
    fwd · automatic · 2G DSM

    Street Build 2K  3

    1995 Eagle Talon TSi
    fwd · automatic · 2G DSM
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