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Pinpoint Test B: Engine Ticking Noise

  1. B1 CHECK FOR TICKING NOISE AT THE FUEL RAIL 
    • Disconnect the first fuel line clip.
    • Is the ticking noise gone? 
    1. Yes:  CHECK for TSB for applicable vehicle. REPAIR as necessary. TEST the system for normal operation.
    2. No:  GO to B2.
  2. B2 CHECK FOR TICKING NOISE AT THE FUEL INJECTOR 
    • Using an EngineEAR, listen at the fuel injectors by placing a probe on each injector. To isolate the faulty injector, disconnect the injector electrical connector and listen for the noise.
    • Is the fuel injector the source of the ticking noise? 
    1. Yes:  INSTALL a new fuel injector. REFER to FUEL CHARGING & CONTROLS - 3.8L & 3.9L for 3.8L engines or FUEL CHARGING & CONTROLS - 4.6L (2V) for 4.6L (2V) engines. TEST the system for normal operation.
    2. No:  GO to B3.
  3. B3 CHECK THE BELT TENSIONER FOR TICKING NOISE 
    • Inspect the accessory drive. Check for the belt tensioner bottoming at end of travel or not at end of stroke.
    • Using an EngineEAR, listen at the belt tensioner.
    • Is the belt tensioner the source of the noise? 
    1. Yes:  INSTALL a new belt tensioner. TEST the system for normal operation.
    2. No:  GO to B4.
  4. B4 CHECK THE WATER PUMP FOR TICKING NOISE 
    • Using an EngineEAR, listen at the water pump for ticking noise.
    • Is the water pump the source of the noise? 
    1. Yes:  INSTALL a new water pump. REFER to ENGINE COOLING . TEST the system for normal operation.
    2. No:  GO to B5.
  5. B5 CHECK FOR AN OBSTRUCTION OF THE COOLING FAN 
    • Inspect the cooling fan for obstructions.
    • Check the cooling fan and shroud for wear or damage.
    • Was there an obstruction or does the cooling fan show signs of damage? 
    1. Yes:  REPAIR or INSTALL a new cooling fan. REFER to ENGINE COOLING . TEST the system for normal operation.
    2. No:  GO to B6.
  6. B6 CHECK THE OIL PUMP FOR TICKING NOISE 
    • Check the oil pump using EngineEARs and probe at the oil filter adapter to verify the oil pump as a source.
    • Is the oil pump the source of the noise? 
    1. Yes:  INSTALL a new oil pump. REFER to ENGINE- 3.8L & 3.9L for 3.8L engines or ENGINE- 4.6L (2V) for 4.6L (2V) engines. TEST the system for normal operation.
    2. No:  GO to B7.
  7. B7 CHECK VALVE LIFTERS OR LASH ADJUSTERS FOR CORRECT OPERATION 
    • Check valve lifter/lash adjuster for correct operation, using EgineEARs.
    • Are the valve lifters/lash adjusters operating correctly? 
    1. Yes:  VERIFY customer concern. CONDUCT a diagnosis of other suspect components.
    2. No:  INSTALL a new valve lifter/lash adjuster(s). TEST the system for normal operation.
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