The cold start timing device (KSB) fully advances the ignition timing at low idle on a cold engine. The KSB does not function after the engine coolant reaches 160 deg. F.
Pre '91 engines used the wax motor type KSB, called so because a pellet of encapsulated engineering wax/plastic expanded when heated to move a plunger, which internally advanced the timing.
Later engines used an electrical solenoid to the same effect.
1988 emission requirements required the timing to be advanced when cold, to reduce white smoke.
The KSB is located on the driver's side, low, and toward the front of the VE44 pump.
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'98 Cummins 12v, 2500, 4WD, 5SPD, 3. 55, Cummins 300 injectors, JRE III kit, 4" turbo to tip exhaust, boost/pyro, 2 1/2" HD coils and rear spring kit, HD upper/lower control arms, Big Medicine. Got Diesel.