Vehicles using AUD engine list:

Engine AUD

Symptoms:
- Rough idling and occasional stalling
- Loss of power and reduced fuel efficiency
- Engine misfires or hesitation during acceleration
- Check Engine Light (CEL) illumination
- Excessive oil consumption or minor oil leaks

Diagnosis:
- Inspect ignition components such as spark plugs, ignition coils, and leads for wear or damage
- Check for vacuum leaks around intake manifold and hoses
- Perform a compression test to assess cylinder health
- Scan the engine control unit (ECU) for fault codes related to misfires, oxygen sensors, or fuel system
- Examine PCV (Positive Crankcase Ventilation) valve operation as it can cause rough running if clogged
- Inspect timing belt condition and tension, as AUD engines rely on proper timing for smooth operation

Fixes:
- Replace worn or fouled spark plugs and faulty ignition coils
- Repair or replace cracked or leaking vacuum hoses
- Clean or replace the PCV valve to restore proper crankcase ventilation
- Address any detected fault codes by repairing or replacing affected sensors (e.g., oxygen sensors)
- Change timing belt and associated components if due or if signs of wear are present
- Fix minor oil leaks by replacing gaskets or seals, especially around valve cover and oil pan
- Use quality fuel and perform regular fuel system cleaning to prevent injector clogging

Prevention:
- Follow manufacturer’s recommended maintenance schedule for timing belt replacement (usually around 60,000 to 90,000 km)
- Regularly replace spark plugs and ignition components as per service intervals
- Use high-quality engine oil and change it at recommended intervals to prevent sludge buildup
- Periodically inspect vacuum lines and PCV valve for signs of wear or blockage
- Avoid prolonged idling and aggressive driving to reduce engine stress
- Keep the fuel system clean by using quality fuel and occasional fuel additives if necessary

By adhering to these guidelines, owners of vehicles equipped with the AUD engine can maintain reliable performance and minimize common issues.