manifold coolant temp sensor
 

is it bad to run with it disconnected? i know it will throw i code but?

Re: manifold coolant temp sensor
 

Why would you want to? There must be a reason why you want to do this!

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.

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

Re: manifold coolant temp sensor
 

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.

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 :lol: ).

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