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Coolant temp sensor


Proven Member
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!


Proven Member
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


Supporting Member
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.

Vegas Smith

Proven Member
Dec 2, 2002
Houston, Texas
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?
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.


DSM Wiseman
Feb 3, 2002
Boulder, Colorado
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?

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.


Proven Member
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.


Supporting VIP
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.
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