Symptom Chart
| Symptom | Possible Sources | Action |
|---|---|---|
| Loss of power/performance | Clogged Air Cleaner (ACL) element | INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. |
| Loose connections or damage to air intake hoses and tubes | TIGHTEN the hose clamps. INSPECT for damage. REPAIR as needed. |
|
| Malfunctioning fuel system | Refer to Engine Controls - Introduction (Except Diesel & Hybrid) . | |
| Poor fuel quality | DRAIN the fuel. FILL with fresh fuel. |
|
| Engine wear (piston rings, valve guides) | REPAIR as needed. | |
| Turbocharger turbine or compressor wheel damage | INSPECT the turbocharger. REFER to Check for Free Rotation -- On Vehicle . | |
| Damaged exhaust or exhaust leaks at turbocharger housing | INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as needed. |
|
| Malfunctioning turbocharger bypass valve | Refer to Engine Controls - Introduction (Except Diesel & Hybrid) . | |
| Obstructed wastegate actuator linkage | INSPECT the turbocharger wastegate linkage for obstructions. REPAIR as needed. |
|
| Damaged wastegate actuator linkage | INSPECT the turbocharger wastegate linkage for damage. INSTALL a new turbocharger as needed. |
|
| Wastegate actuator operation | TEST the wastegate actuator operation. Refer to Engine Controls - Introduction (Except Diesel & Hybrid) . | |
| PCM (powertrain control module) -- DTC (diagnostic trouble code) | For a PCM (powertrain control module) DTC (diagnostic trouble code, REFER to: Electronic Engine Controls | |
| Symptom | Possible Sources | Action |
|---|---|---|
| Excessive oil consumption | Incorrect type or grade of oil | DRAIN the oil. FILL with the specified oil. |
| Oil in exhaust manifolds | REPAIR as needed. | |
| Clogged Air Cleaner (ACL) element | INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. |
|
| Blocked or restricted turbocharger oil return tubes | INSPECT the turbocharger oil return tubes. REPAIR as needed. |
|
| Damaged or collapsed air intake hoses and tubes | TIGHTEN hose clamps. INSPECT for damage. REPAIR as needed. |
|
| Damaged exhaust or exhaust leaks at turbocharger housing to cylinder head | INSPECT for leaks. Leaks can usually be detected audibly or visually, by a discoloration caused by escaping hot exhaust gases. REPAIR as needed. |
|
| Turbocharger oil seals leaking | REFER to Turbocharger Internal Oil Leak Test . | |
| Damaged crankcase ventilation system | INSPECT visually the crankcase ventilation system. REPAIR as needed. |
|
| Symptom | Possible Sources | Action |
|---|---|---|
| Excessive noise | Turbocharger compressor air intake pipe leaking | REPAIR or INSTALL a new pipe as required. |
| Loose connections or damage to air intake hoses and tubes | TIGHTEN hose clamps. INSPECT for damage. REPAIR as needed. |
|
| Air leaks at turbine housing, blown joints or damaged exhaust | TIGHTEN hose clamps. INSPECT for damage. REPAIR as needed. |
|
| Carbon build up in the turbine housing causing contact with turbine wheel | INSPECT the turbocharger. REFER to the Check for Free Rotation -- On Vehicle . | |
| Turbocharger imbalance due to foreign object/damage | INSPECT the turbocharger. REFER to the Check for Free Rotation -- On Vehicle . | |
| Inoperative turbocharger bypass valve | Refer to Engine Controls - Introduction (Except Diesel & Hybrid) . | |
| Symptom | Possible Sources | Action |
|---|---|---|
| Engine emits excessive smoke (black/blue/white) | Clogged Air Cleaner (ACL) element | INSTALL a new Air Cleaner (ACL) element. TEST the system for normal operation. |
| Incorrect type or grade of oil | DRAIN the oil. FILL with the specified oil. |
|
| Blocked or restricted turbocharger oil return tubes | INSPECT the turbocharger oil return tubes. REPAIR as needed. |
|
| Damaged/restricted or leaking turbocharger compressor air intake pipe | REPAIR or INSTALL a new pipe as required. | |
| Engine wear (piston rings, valve guides) | REPAIR as needed. | |
| Plugged crankcase ventilation system | INSPECT visually the crankcase ventilation system. REPAIR as needed. |
|
| Turbocharger oil seals leaking | REFER to Turbocharger Internal Oil Leak Test . | |
| Symptom | Possible Sources | Action |
|---|---|---|
| External turbocharger oil leaks | Turbocharger oil tube seals and/or oil tube leaking | INSPECT visually the turbocharger oil tubes and the turbocharger oil tube seals/gaskets. REPLACE the turbocharger oil tube seals/gaskets and the turbocharger oil tubes as needed. |
| Symptom | Possible Sources | Action |
|---|---|---|
| External turbocharger coolant leaks | Turbocharger coolant tube seals and/or coolant tube leaking | INSPECT visually the turbocharger coolant tubes and the turbocharger coolant tube seals/gaskets. REPLACE the turbocharger coolant tube seals/gaskets and the turbocharger coolant tubes as needed. |