Temp sender

[minuteman]

94 3500HD 6.5 w/auto. I just replaced my wp, t-stat with dual, and fan (cooling upgrade from S&S). When I started the engine to check for leaks, the sending unit was up plugged. When I plugged it in with the engine running, the engine idled down, like an auto choke was released. What is going on? Thanks.

 

[ak diesel driver]

when you plugged it in the ecm thought the engine was warmer and thus a slower idle. unplugged the ecm thinks it's -40

 

[minuteman]

Thanks, just did not make walking around sense to me, now it does. Hard to accept the truck is smater than me!!