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A weak return spring prevents shoes from retracting quickly. Governor (B) and compressor (C) affect pressure supply, not single wheel. Slack adjuster (D) affects stroke, not return. ASE T4 stresses shoe spring inspection during slow release complaints.

If blower works only on high, the resistor pack (which controls lower speeds) is open. The high-speed circuit bypasses resistors, so it still works. Relay (A) controls all speeds, not just low. Pressure switch (C) and evaporator sensor (D) control clutch, not blower. ASE T7 emphasizes checking blower resistors when only the high setting functions.

Noise in neutral with clutch engaged indicates input shaft bearing wear, as the shaft spins in neutral. Depressing the clutch stops the input shaft, removing noise. A worn pilot bearing (B) makes noise when clutch is depressed. A worn release bearing (C) also makes noise during pedal depression. Backlash (D) causes gear noise under load. ASE T3 stresses isolating noise by pedal position to identify the faulty bearing.

Scope analysis showing random secondary voltage collapse indicates coil pack weakness or breakdown. Fuel trims normal rules out fuel restriction. Converter (C) would affect trims and backpressure, not spark waveforms. EGR (D) would dilute charge but not affect spark signals. ASE T1 stresses using ignition scope to detect insulation breakdown and coil weakness.

Smoke test reveals intake leaks. Compression (B) checks cylinders, not intake. Backpressure (C) tests exhaust, fuel pressure (D) tests pump. ASE T1 stresses smoke testing for lean codes from vacuum leaks.