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It's an air temp sensor. It's used by the fan relay, in conjunction with water temp from the MFTS, to run the fan after turning off the engine and protect the alloy head from distortion.
It's definitely supposed to be there.
Thanks guys! I’m dealing with a issue where the car won’t return to idle. I was wondering what it was. I found out I don’t have a coolant temp sensor so I ordered one of those from oreillys. Hope that will fix the issue. If I have any more issues along the way you’ll probably see more threads made.
The idle control valve can slow down if it is dirty or even stick solid especially if it has been left standing for a while.
A good blast out with solvent, ensure the slide valve moves and has no surface damage.
A slow return to Idle may also be an excessively rich mixture. I have had exactly this recently while trying a whole load of things to get my fuelling right. I had a set of injectors on for test which were making it run rich. The lambda control system struggled to bring things back into spec but did do eventually. Revs would come down, loiter around 1500rpm then come slowly back to 900.
The idle control valve can slow down if it is dirty or even stick solid especially if it has been left standing for a while.
A good blast out with solvent, ensure the slide valve moves and has no surface damage.
A slow return to Idle may also be an excessively rich mixture. I have had exactly this recently while trying a whole load of things to get my fuelling right. I had a set of injectors on for test which were making it run rich. The lambda control system struggled to bring things back into spec but did do eventually. Revs would come down, loiter around 1500rpm then come slowly back to 900.
It does return to idle eventually or sometimes dies. I was thinking a coolant temp sensor would help since it needs to know how cold the engine is to know how much fuel to add. Since there’s not even one connected that could be causing an issue.
I can try cleaning out the idle control valve. The car has been sitting inside of about 4 years but that valve was never connected to the car. It was just sitting in a box. I couldn’t understand why the car wouldn’t idle, then I found that idle control valve and now it idles so I was pretty happy about that.
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