Guide library

Symptoms & Troubleshooting

No-starts, noises, smells, leaks, vibration and performance changes.

Use the sound and behaviour during a no-start to narrow the system involved.

Coolant loss, airflow, circulation and internal-engine clues.

How speed, engine load, braking and road surface help narrow a noise.

Common brake sounds and the signs that make them urgent.

How temperature, rpm and load change the meaning of an engine noise.

Fuel, burning, sweet, sulfur and exhaust odours.

How colour, location, smell and rate of loss provide useful clues.

Separate wheel-speed, engine-speed, braking and idle vibration patterns.

Ignition, fuel, air, compression and sensor causes of uneven combustion.

Engine, transmission, exhaust and electronic causes of reduced performance.

Low voltage, poor grounds, wiring faults and parasitic drains.

Separate airflow, temperature, refrigerant, cooling and control problems.