2. Rotate the turbine or compressor wheel and check that the shaft is not damaged and rotates freely. Also check that the wheel blades are not damaged.
3. The discharge actuator is a separate unit and can be replaced independently of the turbocharger. Consult a Renault service station or other specialist if necessary.
4. If the exhaust or intake ports are contaminated with oil, the turbine shaft seals are likely worn or damaged. On the intake side, the intercooler will also be contaminated and will need to be cleaned with a suitable solvent.
5. Check that the oil supply and return pipes are not dirty or blocked, clean them if necessary.
6. Turbocharger repair is not possible. In case of failure, it is necessary to install a new unit.
Note: The following information applies only to models with the F8Q engine. On F9Q engines, the fuel trim and boost pressure are controlled by the electronic fuel injection module.
This device is installed on the fuel pump and is designed to correct the amount of fuel injected by the pump depending on the turbocharger boost pressure.
There is an adjustment screw on the unit, but it is sealed at the factory. Therefore, do not attempt to make any adjustments without the use of diagnostic equipment.
If you suspect that the device is faulty, consult a Renault service station or a qualified specialist.
(Original publication on the website: RENAULTBOOK)