Vehicles using B230GT engine list:

Engine B230GT

Symptoms:
- Loss of power or poor acceleration
- Rough idling or stalling
- Excessive smoke from the exhaust
- Oil leaks around the turbocharger or valve cover
- Overheating or coolant loss
- Unusual noises such as knocking or ticking

Diagnosis:
- Check for vacuum leaks and intake manifold cracks, common in older B230GT engines
- Inspect turbocharger for shaft play, oil leaks, and boost pressure issues
- Perform compression test to assess cylinder health
- Examine timing belt condition and alignment; worn or slipped belts cause performance issues
- Inspect PCV system for clogging or malfunction
- Check for oil leaks at valve cover gasket and turbo oil lines
- Monitor coolant levels and inspect radiator and hoses for leaks

Fixes:
- Replace worn or cracked vacuum hoses and intake gaskets
- Rebuild or replace turbocharger if excessive shaft play or oil leakage is found
- Change timing belt and tensioner at recommended intervals (typically every 60,000–90,000 km)
- Clean or replace clogged PCV valve to prevent pressure buildup and oil leaks
- Replace valve cover gasket and turbo oil feed/return lines to stop oil leaks
- Flush cooling system and repair any leaks; replace thermostat if overheating persists
- Use high-quality synthetic oil and change regularly to protect turbo and engine internals

Prevention:
- Adhere strictly to maintenance schedule, especially timing belt and turbo servicing
- Use recommended oil grade and change oil and filter frequently to maintain turbo health
- Regularly inspect vacuum lines and intake system for cracks or leaks
- Monitor coolant levels and condition to avoid overheating
- Avoid prolonged idling and aggressive driving to reduce turbo stress
- Address minor oil leaks promptly to prevent larger engine damage

By following these diagnostic steps and maintenance tips, owners of Volvo 940 and 960 models equipped with the B230GT engine can ensure reliable performance and longevity.