The hydraulic lifters 'afm' collapsed, lifter was in locked position causing lifter to tap on camshaft, by taping on camshaft caused de-lamentation of hardening on camshaft, which damaged camshaft and lifters. The acceleration and de-acceleration of the vehicle became a major safety issue. The vehicle went from v-8 mode to v-4 mode, this abrupt reduction in speed would happen and did happen while driving on major roads in the city. Because the v-8 lifters would shut the cylinders off, v-8 mode would stay in locked down position causing vehicle to almost come to a complete stop.
2013 GMC Yukon engine complaints
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