Cause 
 | Correction 
 | 
 Low oil pressure 
 | 
|     •  | Repair or replace as required. |  
  
 | 
 Improper valve lash adjustment 
 | 
|     •  | Repair or replace as required. |  
  
 | 
 Improper lubrication to the valve train 
 |  Inspect the following components, and repair or replace as required: 
|     •  | The oil filter bypass valve |  
  
|     •  | The oil pump and pump screen |  
  
|     •  | The engine block oil galleries  |  
  
 | 
 Broken valve spring 
 |  Replace the valve spring. 
 | 
 Stretched or broken timing belt and/or damaged sprocket teeth 
 |  Replace the timing belt and sprockets. Refer to 
Timing Belt Replacement
. 
 | 
 Worn engine camshaft lobes 
 | 
|     •  | Inspect the engine camshaft lobes. |  
  
 | 
 Worn valve guides or valve stems 
 |  Inspect the following components, and repair as required: 
 | 
 Stuck Valves 
 (Carbon on the valve stem or valve seat may cause the valve to stay open) 
 |  Inspect the following components, and repair as required: 
 |