Incorrect oil filter without anti-drainback feature

Install the correct oil filter.

Incorrect oil viscosity

1. Drain the oil.
2. Install the correct viscosity oil.

High valve clearance adjuster leak down rate

Replace the clearance adjusters as required.

Worn crankshaft thrust bearing

1. Inspect the thrust bearing and crankshaft.
2. Repair or replace as required.

Damaged or faulty oil filter by-pass valve

1. Inspect the oil filter by-pass valve for proper operation.
2. Repair or replace as required.

Malfunctioning camshaft position actuators - improper oil viscosity or contamination.

1. Verify correct oil pressure. If low, inspect the bottom of the oil filter for oil filter drain back feature. Refer to Oil Pressure Diagnosis and Testing : LE5 or LE9 .
2. Isolate the noise to a specific camshaft position actuator. Disconnect the electrical connector on the camshaft position actuator solenoid valves and start the vehicle. If noise is gone, repeat procedure to limit to an individual actuator. Refer to Camshaft Position Intake Actuator Replacement : LE5 or LE9 or Camshaft Position Exhaust Actuator Replacement : LE5 or LE9 .