CIS - Thermotime switch and exhaust smoking

[kpfoten]

Hey, Thought I'd run one buy you guys--

Tonight it was dark, I was going to tune my fuel mixture. I started up the car and it started smoking like crazy. I drove it around the block and it was still smoking. The kicker was that I couldn't see what color smoke was coming out of the pipe because it was too dark!

I parked the car and noticed that one of the connectors to the thermo-time switch was loose. Seated it firmly, started the car up and no smoke!

Would this make sense? No response from the thermo-time switch so the CSV was dumping fuel?

Any takers?

Thanks!

[Nathan]

The CSV is only used at start ups. On a different note on a 77 280Z that I was checking out while it was running I disconnected the coolant temperature sensor wires and it started smoking probably running lean since it was white smoke not black. Connect back and went away however that car had a computer which is different from CIS .But that thermo time sensor sends a signal to the CSV. Not sure if your car was at operating temp or still cold but it should make a differance with that connect unplug.
Nathan

[tsuter]

The thermo time switch provides the ground side only to the CSV. If it is unplugged, then no ground and the CSV will not function at startup. When motor/thermo time switch is hot, the thermo time switch is open and thus there is no ground and the CSV will not work either and it should not.

[kpfoten]

Tsuter, is Nathan correct in saying that it may have been running lean upon startup? (Hence what possibly looked white (in the dark) smoke?)

Thanks!