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Home >> Ford >> 2023 >> Escape ST-Line Select >> Repair and Diagnosis >> Engine Mechanical >> Blowers, Superchargers & Turbochargers >> Fuel Charging And Controls - Turbocharger - 1.5L ECOBOOST (129KW 175PS) (Cr) >> Diagnosis And Testing >> Turbocharger >> Pinpoint Tests >> Pinpoint Test A: Blue Smoke From Exhaust

Pinpoint Test A: Blue Smoke From Exhaust

  1. Possible Sources 

    • Oil leak
    • Air cleaner
    • Air intake
    • Crankcase ventilation system
    • Internal engine damage
    • Turbocharger

  2. A1 CHECK THE EXHAUST

    • Start the engine.

    • Monitor the exhaust system.

    Is blue smoke noticeable from the exhaust system? 

    Yes  GO to  A2
    No  INSPECT for external oil leaks. REFER to Lubricants, Fluids, Sealers and Adhesives  for the engine being diagnosed.

  3. A2 CHECK THE AIR CLEANER

    • Inspect the air cleaner.

    Is the air cleaner clogged? 

    Yes  REPLACE the air cleaner. Refer to the appropriate service information engine being diagnosed. Check the system for normal operation.
    No  GO to  A3

  4. A3 CHECK THE AIR INTAKE PIPES AND HOSES

    • Inspect the air intake pipes and hoses for loose connections or leaks.

    Were any loose connections or leaks found from the air intake pipes or hoses? 

    Yes  REPAIR or REPLACE the intake air system. Refer to appropriate Engine Cooling System service information for the procedure.
    No  GO to  A4

  5. A4 CHECK THE CRANKCASE VENTILATION SYSTEM

    • Check the crankcase ventilation system for damage and correct operation. REFER to DIAGNOSIS AND TESTING  procedure for the engine being diagnosed.

    Is the crankcase ventilation system damaged? 

    Yes  CLEAN, REPAIR or REPLACE the crankcase ventilation components. Refer to the appropriate Crankcase Ventilation service information for the procedure.
    No  GO to  A5

  6. A5 CHECK THE AIR INTAKE PIPES AND HOSES FOR EXCESSIVE OIL

    NOTE: It is normal for a small amount of combustion gas to pass into the crankcase. This gas is scavenged into the air intake system through the positive crankcase ventilation system, which incorporates a crankcase vent oil separator. Some engine oil, in the form of a vapor, is carried into the air intake system with the blow-by gases (this engine oil also contributes to valve seat durability). This means that oil will collect inside the air intake components and the turbocharger. This is not an indication that the turbocharger oil seal has failed. The turbocharger oil seal will generally not fail unless the bearings fail first, which will cause the turbocharger to become noisy or seize. Do not install a new turbocharger due to oil inside the intake.

    • Inspect the inside of the air intake pipes and hoses for excessive oil.

    Is excessive oil noticeable? 

    Yes  GO to  A6
    No  Diagnose internal engine damage. REFER to the DIAGNOSIS AND TESTING  for the engine being diagnosed. Follow the pinpoint test to diagnose blue smoke.

  7. A6 CHECK THE TURBOCHARGER

    • Inspect the compressor wheel for damage.

    • Check that the turbine shaft spins free.

    • Check for contact marks between the compressor wheel and the housing.

    Is the turbocharger damaged? 

    Yes  INSTALL a new turbocharger. REFER to the Turbocharger 
    No  Diagnose internal engine damage. REFER to the Engine . for the engine being diagnosed. Follow the pinpoint test to diagnose blue smoke.
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