Pinpoint Test B: Engine Ticking Noise
- B1 CHECK FOR TICKING NOISE AT THE FUEL RAIL
- Disconnect the first fuel line clip.
- Is the ticking noise gone?
Yes : CHECK for TSB for applicable vehicle. REPAIR as necessary. TEST the system for normal operation.
No : GO to B2.
- 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?
Yes : INSTALL a new fuel injector. REFER to FUEL CHARGING & CONTROLS . TEST the system for normal operation.
No : GO to B3.
- 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?
Yes : INSTALL a new belt tensioner. TEST the system for normal operation.
No : GO to B4.
- 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?
Yes : INSTALL a new water pump. REFER to ENGINE COOLING . TEST the system for normal operation.
No : GO to B5.
- 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?
Yes : REPAIR or INSTALL a new cooling fan. REFER to ENGINE COOLING . TEST the system for normal operation.
No : GO to B6.
- B6 CHECK THE OIL PUMP FOR TICKING NOISE WARNING: If equipped with fire suppression system, depower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .
- With the vehicle in NEUTRAL, position it on a hoist. Refer to JACKING & LIFTING .
- 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?
Yes : INSTALL a new oil pump. REFER to ENGINE . TEST the system for normal operation. If equipped with fire suppression system, GO to B8.
No : GO to B7.
- B7 CHECK VALVE LIFTERS OR LASH ADJUSTERS FOR CORRECT OPERATION
- Check valve lifter/lash adjuster for correct operation, using EngineEARs.
- Are the valve lifters/lash adjusters operating correctly?
Yes : VERIFY customer concern. CONDUCT a diagnosis of other suspect components. If equipped with fire suppression system, GO to B8.
No : INSTALL a new valve lifter/lash adjuster(s). TEST the system for normal operation. If equipped with fire suppression system, GO to B8.
- B8 REPOWER THE FIRE SUPPRESSION SYSTEM
- Verify that the fire suppression system is repowered. For additional information, refer to FIRE SUPPRESSION SYSTEM .
- Is the fire suppression system repowered?
WARNING: If equipped with fire suppression system, repower the system. For important safety warnings and procedures, refer to FIRE SUPPRESSION SYSTEM .Yes : Fire suppression system repowering is complete.
No : REFER to FIRE SUPPRESSION SYSTEM for fire suppression system depowering and repowering procedure.