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A vacuum leak leans mixture most at idle when manifold vacuum is highest, forcing trims up. At cruise, airflow dilutes leak, normalizing trims. Fuel filter (B) restricts under load. Coil (C) causes misfire across RPM. Converter (D) causes load issues, not idle roughness. ASE T1 emphasizes using fuel trims at idle vs cruise to isolate vacuum leaks.

Shimmy at low speeds in turns often comes from worn tie-rod ends, which allow uncontrolled wheel movement. Caster angle (A) affects returnability, not shimmy. Low pressure (C) causes edge wear, not steering shake. Loose U-bolts (D) cause axle shift or dog-tracking, not turn-related shimmy. ASE T5 emphasizes checking tie-rod ends, drag links, and kingpins when shimmy complaints occur.

A voltage drop above 0.3 V on the ground side indicates high resistance. Cleaning or replacing the ground cable restores current flow. Alternator (A) and solenoid (D) aren’t involved in this measurement. Replacing battery (B) won’t solve a ground path restriction. ASE T6 stresses voltage drop testing to locate resistance on both positive and negative sides.

Pop-out under load usually indicates shift collar not held fully in gear—caused by worn shift fork or weak rail detents. Clutch brake (B) affects reverse engagement. Pilot bearing (C) causes drag, not selective pop-out. Fluid level (D) causes wear but not selective disengagement. ASE T3 stresses checking fork straightness and detent condition.

If actual rail pressure lags behind commanded consistently, the high-pressure fuel pump cannot meet demand. Boost is fine, so air delivery is adequate. A failed boost sensor (B) would trigger incorrect boost readings, but rail pressure wouldn’t lag. A leaking charge air cooler (C) would lower boost, not pressure. A faulty EGR (D) may reduce power but doesn’t directly lower rail pressure. ASE T2 emphasizes using scan tool data to compare commanded vs actual rail pressure under load to diagnose pump deficiencies.