The heat resistance of the adhesive that bonds the vibration isolation rubber on the crankshaft pulley, which drives the auxiliary belt of the engine, is insufficient. Because of this, the adhesive power may decrease by the heat in high speed travel, causing the rubber to separate from the pulley, and the crank angular sensor or sensing blade may get damaged from it, impairing engine control. At worst, the engine stalls and will not restart, or the engine revolution rises.