Upper end engine noise

Common sources of upper end engine noise (ticking, knocking or rattle) include the fuel injectors, camshaft phaser sprocket(s), camshaft(s) and valve train. Upper end engine noise can be determined using the Engine EAR/Chassis EAR or stethoscope on the valve cover bolts. If the noise is loudest from the valve cover bolts, then the noise is upper end. The Engine EAR/Chassis EAR or stethoscope can be used to further isolate the noise to the specific cylinder bank and cylinder. Removal of the valve covers will be required to pinpoint the source of the noise.

• Fuel Injector Noise
  • A common source of an engine ticking noise can be related to the fuel injector(s). This is normal engine noise that can be verified by listening to another vehicle. If the injector noise is excessive or irregular, use the Engine EAR/Chassis EAR or stethoscope to isolate the noise to a specific fuel injector.
• Valve Train
  • Lash adjusters/valve tappets can make an engine ticking or tapping noise noticeable at any engine rpm or temperature and is audible through the wheel well or an open hood. However, with the hood down, lash adjuster/valve tappet noise can be heard as a light tapping noise through the wheel well and is considered normal. The Engine EAR/Chassis EAR or stethoscope can be used to further isolate the noise to the specific cylinder bank and cylinder, some disassembly of the engine may be required to inspect for damage or wear.