Coolant Temperature Sensor, tells the computer how hot <or cold> the motor
is and adjusts air/fuel mixture accordingly. If it's nearing the end of
it's life (or completely shot), it defualts to -40F which runs a super rich
mixture and can cause the black smoke. It's located right next to the
waterneck on the intake, will have two wires (usually yellow and black).
Isn't that supposed to cause a constant rich setting though?
-The Lonely Grease Monkey
1985' K5 305CUI TH700R4 NP208
"Ignorance is preferable to error; and he is less remote
from the truth who believes nothing, then he who believes
what is a wrong."
- Thomas Jefferson
Some advice if you replace the FP regulator:
don't just buy the repair kit. Buy the whole darn thing. The spring
inside the regulator likes to break into multiple pieces, and it
doesn't come in the repair kit. You will invariably find this out at
9pm on a Sunday evening. Without that intact spring, the reg can not
Ask me how I know. ;)
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