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Too fast of an idle.

ak diesel driver

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This is on my 94 plow truck. Idles at about 11-1200 rpm. When I first start it cold it idles even higher and then goes down to the 11-1200 rpm after it warms up a bit. I'm thinking of replacing the ECT sensor in the crossover is there anything else to check. Seems odd to slow down after the initial warm up but not more later.
 

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FRANKENBURBAN
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I would definitely look at either a bad coolant temp sensor, bad connection at the CTS, or a bad/broken ECM ground. If you have a scanner it would narrow down where to look alot quicker.
 

ak diesel driver

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So I decided to jumper the connector and when I did I got a reading of 304* so I disconnected the jumper and back to -34.4. so I plugged it back in and now it works. Don't know for sure what it was but I suspect the connection was not good and messing with it cleaned it up a bit.
At least I know where to look if it acts up again.
 

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FRANKENBURBAN
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The pins on the coolant temp sensor are not very good quality. They're not coated like the ECM pins are. I've had to replace several before because of corrosion.
 
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