The wax motor style KSB is used on pre-1991 B series automotive engine ratings using the Bosch VE fuel pump.
NOTE: The electrical solenoid style KSB is used on 1991 model and newer B series atuomotive engine ratings using
the Bosch VE fuel injection pump. See Procedure (5-08), Cold Start Timing Advance System (KSB) – Electrical Solenoid Style, for additional information.
Need For KSB on 1988 VE Pumps
1988 emission requirements prompted the need for a cold start timing advance system (KSB) to minimize white smoke.
After the engine starts, the wax motor style KSB fully advances the ignition timing at low idle until the engine warms
up. The KSB is not functional after the engine reaches 160ยฐF coolant temperature.