I have a 87 Camaro with an 86 TPI. I redid the intake gasket and damaged either my Cold Start Injector module or the Cold Start Injector iteself. My question is does the wire that comes out of the CSI module give ground or voltage to the injector?

 

If I recall, the thermostatic switch *thing* in the front of the TPI has voltage going to it, as well as sensing the engine temp.

When you turn the engine to START, it applys a voltage to the switch in the form of a heating element. This element heats up the sensor similar as to how the engine heat would heat it up. The point is that the circuit will provide power to the cold start injector when the switch is cold.

This is a poor description, but think of the switch like a the old choke on a carb. When the engine is hot, it does nothing. When the engine is cold it does something. The electric heater is a crude timing circuit that provides voltage to the cold start switch as long as the engine is cold. The colder the engine, the longer to warm up the sensor and thus the longer the cold start fuel assist.

The cold start circuit is not computer controlled. It is a seperate circuit that gets power from the START circuit.

If you have a fuel pressure gauge you could check if it is working.
You would have to disconnect the dist. +12 wire or the starter wire so that the engien does not start. As you crank the engine over, the fuel pressure should drop because of the cold start circuit. The engine must be cold. If you do this on a +95 day I doubt the cold start would even be necessary.

Mark.