manifold coolant temp sensor
10-31-2010, 09:46 PM
#2
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Join Date: May 2007
Location: Fort Atkinson, WI
Posts: 344
11-01-2010, 05:46 PM
#4
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Join Date: Jun 2004
Location: Austin, TX
Posts: 151
Re: manifold coolant temp sensor
It's not too bad to run with the CTS or IAT disconnected but you will run likely richer than you need, thus fouling plugs and wasting a lot of fuel. It is acceptable just for testing but I wouldn't drive it like that to work every day.
You can test the CTS and IAT sensors with a simple ohm-meter if you need. They do go bad, just like any other sensors.
Hope this helps.
Lou
You can test the CTS and IAT sensors with a simple ohm-meter if you need. They do go bad, just like any other sensors.
Hope this helps.
Lou
11-02-2010, 12:46 AM
#5
Registered User
Join Date: May 2007
Location: Fort Atkinson, WI
Posts: 344
Re: manifold coolant temp sensor
It's not too bad to run with the CTS or IAT disconnected but you will run likely richer than you need, thus fouling plugs and wasting a lot of fuel. It is acceptable just for testing but I wouldn't drive it like that to work every day.
You can test the CTS and IAT sensors with a simple ohm-meter if you need. They do go bad, just like any other sensors.
Hope this helps.
Lou
You can test the CTS and IAT sensors with a simple ohm-meter if you need. They do go bad, just like any other sensors.
Hope this helps.
Lou
11-02-2010, 09:23 AM
#6
Registered User
Join Date: Jun 2004
Location: Austin, TX
Posts: 151
Re: manifold coolant temp sensor
I assume you have a TPI intake? You can test it the same way as a CTS (since it's actually a CTS in there that's measuring the heatsoaked manifold instead - Chevy does not believe in measuring the real AIR temperature with its Intake Air Temp sensor 
).
You can pull the sensor out and measure its resistance at several temperature points.
Use this chart for resistance reference: http://www.thirdgen.org/techboard/at...ase-ctsmat.gif
If you measure the sensor cold, let's say outside on a 50-degree day, you should see several kilo-ohms in resistance (around 5).
If you put the sensor in the freezer for half an hour, you should be able to measure around 25 kohm.
Put the sensor in a boiling pot and measure it at least at boiling point (around 180 ohm). You can also measure points in between, using a reference thermometer, it's up to you. Just like in the good old days of school lab work.
That will tell you whether the IAT/CTS is out of range. Sometimes they just stop reading at all.
Let us know what you find.
Lou
).You can pull the sensor out and measure its resistance at several temperature points.
Use this chart for resistance reference: http://www.thirdgen.org/techboard/at...ase-ctsmat.gif
If you measure the sensor cold, let's say outside on a 50-degree day, you should see several kilo-ohms in resistance (around 5).
If you put the sensor in the freezer for half an hour, you should be able to measure around 25 kohm.
Put the sensor in a boiling pot and measure it at least at boiling point (around 180 ohm). You can also measure points in between, using a reference thermometer, it's up to you. Just like in the good old days of school lab work.
That will tell you whether the IAT/CTS is out of range. Sometimes they just stop reading at all.
Let us know what you find.
Lou
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