Vehicles using B5204T4 engine list:

Engine B5204T4

Symptoms:
- Rough idling and hesitation during acceleration
- Loss of power or reduced engine performance
- Engine warning light illumination
- Oil leaks around the valve cover gasket area
- Unusual engine noises such as ticking or knocking

Diagnosis:
- Check for vacuum leaks and intake manifold gasket condition
- Inspect ignition coils and spark plugs for wear or damage
- Perform a compression test to assess cylinder health
- Scan for fault codes related to fuel injection, ignition, or emissions systems
- Examine timing belt condition and tension, as failure can cause severe engine damage
- Inspect valve cover gasket for leaks and replace if necessary

Fixes:
- Replace worn or faulty ignition coils and spark plugs to restore smooth running
- Repair or replace leaking valve cover gasket to prevent oil loss and contamination
- Replace timing belt and associated components (tensioner, pulleys) at recommended intervals (typically every 100,000 km or 5 years) to avoid catastrophic failure
- Clean or replace the mass airflow sensor and throttle body if dirty or malfunctioning
- Address any vacuum leaks by replacing cracked hoses or gaskets
- Update engine control unit (ECU) software if applicable to improve performance and emissions

Prevention:
- Adhere strictly to scheduled maintenance, especially timing belt replacement intervals
- Use high-quality engine oil and change it regularly to prevent sludge buildup and wear
- Regularly inspect and replace ignition components as part of tune-ups
- Keep the intake system clean and free of leaks to maintain optimal air-fuel mixture
- Monitor engine warning lights promptly and address issues early to avoid further damage
- Store the vehicle in a dry environment to reduce gasket and seal deterioration

By following these guidelines, owners of vehicles equipped with the B5204T4 engine can maintain reliable performance and extend engine life.