Symptom | Possible Sources | Action |
Blue smoke with excessive turbocharger noise | * Turbocharger compressor rubbing on housing walls. * Turbocharger turbine rubbing on housing walls. * Turbocharger bearings and oil seal(s). * Turbocharger oil supply tube blocked or damaged. | * INSPECT the turbocharger for signs of damage. INSTALL a new turbocharger as necessary. REFER to: Turbocharger (303-04F Fuel Charging and Controls - Turbocharger - 2.5L Duratec (VI5), Removal and Installation). |
Blue smoke without excessive turbocharger noise | * Turbocharger oil return tube blocked or damaged. | * Check the oil return tube for blockage or damage, INSTALL a new oil return tube as necessary. |
Poor engine performance | * Vacuum diaphragm unit vacuum line(s). | * CHECK all vacuum line(s) are installed and no signs of air leaks are present. REPAIR as necessary. |
* Charge air cooler system. | * CHECK the charge air cooler, charge air cooler pipes and charge air cooler hoses for leaks and obstructions. REPAIR as necessary. |
* Air cleaner intake pipe. | * CHECK the air cleaner intake pipe for obstruction. REPAIR the necessary. |
* Unauthorized adjustment of the vacuum diaphragm unit actuator rod. | * The turbocharger boost pressure is factory set and must not be adjusted. CHECK the paint seal on the vacuum diaphragm unit actuator rod has not been broken. If the paint seal has been broken, INSTALL a new turbocharger. REFER to: Turbocharger (303-04F Fuel Charging and Controls - Turbocharger - 2.5L Duratec (VI5), Removal and Installation). |
* Vacuum diaphragm unit actuator rod. | * CHECK the vacuum diaphragm unit actuator rod moves freely, If the vacuum diaphragm unit actuator rod does not move freely. CHECK for signs of damage or signs of foreign material. REPAIR as necessary. |