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ASE A8 requires interpreting emissions results. High hydrocarbons indicate unburned fuel reaching the exhaust, most commonly due to misfire from weak ignition, fouled plugs, or bad wires. Vacuum leaks cause lean misfire but typically raise NOx, not HC alone. Lean mixtures also increase NOx. Restricted exhaust affects CO and performance, not specifically HC. ASE stresses ignition system inspection and misfire diagnostics to address high HC.

ASE A4 stresses tire wear patterns. Excessive toe-out scrubs the inner edges of both tires. Toe-in causes outer wear. Camber affects one side more than both evenly. Caster affects pull, not tire edge wear. ASE requires proper toe adjustment during alignment.