For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
1 | Is a knock noise heard under all engine speeds? | Go to Step 2 | System OK
2 | Inspect the crankshaft connecting rod journal. Is the crankshaft connecting rod journal worn? | Go to Crankshaft Replacement | Go to Step 3
3 | Measure the oil pump pressure. Is the oil pump pressure low? | Go to Oil Pressure Diagnosis and Testing | Go to Step 4
4 | Inspect the crankshaft connecting rod journals. Are the journals out-of round? | Go to Crankshaft Replacement | Go to Step 5
5 | Inspect the connecting rods. Is there a misaligned connecting rod? | Go to Camshaft Replacement | Go to Step 6
6 | Inspect the connecting rod bolts. Are the connecting rod bolts torqued properly? | System OK | Go to Camshaft Replacement