What Causes the Metallic Screeching Sound During Cold Start of a Prado?
1 Answers
The causes of metallic screeching sound during cold start of a Prado include: 1. Loose accessory belt, leading to increased load and belt noise when accelerating; 2. Carbon buildup in the throttle body, causing poor throttle response and dirty idle control valve/throttle plate; 3. Carbon-oil mixture accumulation in the engine intake tract, resulting in buzzing noise during sudden acceleration. Solutions: 1. Inspect generator/compressor/power steering pump belts for looseness and replace/tighten if needed; 2. Check throttle body contamination for cleaning and recalibration; 3. Clean intake tract oil-carbon mixture using specialized intake cleaner; 4. Inspect throttle pedal spring for looseness/fatigue and replace if necessary.