Keeping your throttle body clean is an essential part of care care maintenance. Why does my throttle body get dirty? Over time the throttle body gets dirty from oil and combustion gas vapors that come from modern PCV (positive crankcase ventilation) systems. Modern PCV systems recirculate back to the intake where gasses are re-combusted. Recirculation is via a hose which is connected somewhere close to the throttle body. During startup, operation and shutdown air intake pressure changes which...
