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Old 10-31-2010, 07:26 PM   #1
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manifold coolant temp sensor

is it bad to run with it disconnected? i know it will throw i code but?
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Old 10-31-2010, 10:46 PM   #2
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Re: manifold coolant temp sensor

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Originally Posted by Wishmaster View Post
is it bad to run with it disconnected? i know it will throw i code but?
Why would you want to? There must be a reason why you want to do this!
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Old 10-31-2010, 10:50 PM   #3
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Re: manifold coolant temp sensor

because im trying to pin point a problem that has been going on for to damn long...and i kinda wanna sell the car and would like to get it fixed.
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Old 11-01-2010, 06:46 PM   #4
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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
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Old 11-02-2010, 01:46 AM   #5
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Re: manifold coolant temp sensor

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Originally Posted by BigBadLou View Post
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
I do not want to hijack this thread, but Lou how do you check the IAT. I think I may have a problem with it on my formula 350 from what people are telling me.
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Old 11-02-2010, 10:23 AM   #6
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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
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Old 11-02-2010, 10:23 AM
 
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