The KSB provides a cold start timing advance to minimize white smoke. Emission requirements in 1988 prompted the need for a cold start timing advance system (KSB) to minimize white smoke. It is not a cold start aid in starting device.
The KSB in the picture is the Wax Motor style. The sensor is located in the engine coolant jacket under the intake manifold and is normally open (NO). When the engine temperature (coolant) reaches 160 degrees F, the sensor closes and applies 12 volts to the KSB wax motor, which returns timing to normal.. Once the engine reaches 160 degrees, the KSB is no longer functional.
To disable the KSB, just run a constant source of 12 volts to the KSB and it will not function. Disable in this manner totally by-passes the coolant sensor. All my trucks run with the KSB in a Non Functional Mode ie 12 volts constantly on the KSB Wax Motor, the same as it would be after warm up. I dont have any white smoke issues
There is another type of KSB powered by a Solenoid. Its sensor is in the Intake manifold cover and measures air temperature in the intake manifold. The sensor operates at 90 degrees F and is Normally Closed (NC). When the intake internal air temperature reaches 90 degree F, the sensor opens and timing returns to normal. To disable this type of KSB, Just unplug the wire to the Solenoid and you will no longer have cold start advance.
Paul