Vehicles using B6304T4 engine list:

Engine B6304T4

Symptoms:
- Rough idling and misfires
- Loss of power and poor acceleration
- Engine warning light illumination
- Excessive oil consumption or leaks
- Coolant leaks or overheating issues
- Unusual noises from the timing chain area

Diagnosis:
- Check for fault codes using an OBD-II scanner to identify misfires or sensor failures
- Inspect ignition coils and spark plugs for wear or damage
- Perform a compression test to assess cylinder health
- Examine timing chain tensioner and guides for wear or failure, as timing chain issues are common
- Inspect turbocharger operation and boost pressure for performance problems
- Check for oil leaks around the valve cover gasket and oil cooler seals
- Monitor coolant levels and pressure test the cooling system for leaks

Fixes:
- Replace faulty ignition coils and worn spark plugs to resolve misfires
- Repair or replace leaking gaskets and seals to stop oil leaks
- Replace timing chain tensioner and guides if worn to prevent timing chain slack and potential engine damage
- Service or replace the turbocharger if boost pressure is insufficient or if there are unusual noises
- Flush and refill the cooling system, repair leaks, and replace thermostat if overheating occurs
- Address any detected sensor faults by replacing the affected sensors

Prevention:
- Follow recommended oil change intervals using high-quality synthetic oil to maintain proper lubrication and reduce wear
- Regularly inspect and replace spark plugs and ignition components as per service schedule
- Monitor coolant levels and condition to prevent overheating
- Avoid prolonged idling and aggressive driving to reduce stress on the timing chain and turbocharger
- Use OEM or high-quality replacement parts for repairs to ensure reliability
- Schedule periodic professional inspections to catch early signs of timing chain or turbocharger wear

By adhering to these maintenance and diagnostic steps, owners of Volvo S60 T6 AWD and V60 T6 AWD models with the B6304T4 engine can minimize common issues and maintain engine performance.